Medium Speed Answers - CES Engine, Management

Welcome to the website where you can pass online the CES test on the subject «STCW Engine, Management, Medium Speed». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. CES based on practical information and marine specialists experience.

CES tests developed for evaluating seaman basic knowledge by Seagull Company (rebranded as «OTG»), is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW.

Version: 6.0.0.
Test type: STCW.
Department: Engine.
Level: Management
Engine: Medium Speed

CES tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew. Ocean Technologies Group use various subjects for question creation, which includes:

Crowd and Crisis Management;
Integrated Navigation System (INS);
Ballast water management;
Handling and Stowage;
Vessel operation management and safety;
Marine engineering;
Maintenance and repair, etc.

Current test contains Seagull CES questions on the subject «STCW Engine, Management, Medium Speed». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.

«Engine» subject includes theoretical and practical information about advanced training for work on any type of vessel. Knowledge of this information directly shows employee’s competence who holds a relevant post on a vessel. The Department of Engine Management on a ship, specifically focusing on medium-speed engines, is responsible for overseeing the operation, maintenance, and performance optimization of the vessel’s propulsion system. This includes tasks such as monitoring fuel consumption, managing engine speed and power output, conducting routine inspections, and troubleshooting any technical issues that may arise during the voyage. Additionally, they play a crucial role in ensuring compliance with environmental regulations related to emissions and efficiency standards for maritime engines. Overall, the department plays a vital role in ensuring the safe and efficient operation of the ship’s engines throughout its journeys.

On this site Crew Evaluation System Test on the subject «Engine, Management, Medium Speed» contains 117 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.

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Amount of questions: 117.

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Code: cwWZHhSK How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?

Positive displacement pumps operate at constant pressure and cannot be regulated.

Adjustment of the pressure relief valve to recirculate part of the flow.

By throttling the discharge valve.

By throttling the suction valve.

Code: BAMNMf1y The torsion meter for the main propeller shaft is reading high. The torque is sensed using the angle of twist principle with two clamp rings attached to the shaft at a fixed distance, with stationary proximity switches for measuring the angle of twist and also shaft speed fixed to a rigid stool. What is the most likely cause of the high reading?

Axial slip of one of the clamp rings to bring them closer together.

Circumferential slip of the forward clamp ring in the opposite direction to shaft rotation.

Circumferential slip of the after clamp ring in the opposite direction to shaft rotation.

Axial slip of one of the clamp rings to move them further apart.

Code: 6rHg$cHW How can a lead-acid type battery be checked to confirm if it is fully charged or not?

Measure the relative density (specific gravity) of the electrolyte.

Measure the battery voltage.

Measure the level of the electrolyte.

Measure the temperature of the electrolyte.

Code: U55ccR14 The bottom end bolts employed in 4 stroke diesel engines are usually given a finite life and must be replaced periodically. What would be the normal failure mode that would affect these bolts if they were not replaced as required?

Failure due to fatigue stresses.

Failure due to tensile stresses.

Failure due to torsional stresses.

Failure due to bending stresses.

Code: cCg5SP1o How will continuous low load operation influence the time between overhauls, tbo, for the cylinder covers and associated valves of a 4-stroke diesel engine?

Increase the time between overhauls since fuel injectors work better at low load so combustion will be improved and the maintenance will be reduced.

No influence at all, the required overhauls are unaffected by operating load.

Increase the time between overhauls since the engine is not working as hard.

Reduce the time between overhauls due to increased fouling.

Code: $1Rq#m6i How should the spare oxygen and acetylene gas welding bottles be stored onboard the ship?

In two separate rooms outside the engine room space.

In the steering flat.

In a refrigerated room.

In the workshop in the engine room as close as possible to welding equipment.

Code: t$aX4Jh$ MARPOL - Annex V. Disposal of garbage. Your vessel is in the Red Sea (Special Area) and the Chief Cook is requesting to have some food waste burned in the incinerator. Due to problems with incinerator, you decide to have the waste ground in the Grinder (Lump size max. 25 mm) and disposed off into the sea. Is this prohibited, if not, how far from nearest land is this legal?

3 miles.

12 miles.

25 miles.

This is prohibited.

Code: JJFgMEYX A water heating system with automatic temperature control uses steam as the heating medium and the temperature is controlled by a pneumatically operated valve. What would be an acceptable start up procedure of the system from cold state?

Start the system up in manual mode and gradually increase the controller output signal until the temperature reaches the required value before changing over to automatic control.

Start the system up in automatic mode with normal set point so that the required temperature is achieved as quickly as possible.

Start with the control valve in manual and use the hand jack to gradually increase the temperature by throttling the steam flow before changing to pneumatic control.

Start the system up in automatic mode with normal set point but with the steam supply to the control valve manually throttled in.

Code: ffux3CXA How often are "abandon ship" drills required to be held on cargo vessels according to SOLAS?

Once every year.

Once every month.

Once every week.

Once every 6 months.

Code: $Xwjl#Mq Which is the preferred method for starting an air conditioning refrigeration compressor which has been shut down for a period of time?

Start with suction valve throttled in to minimise risk of drawing liquid refrigerant into the compressor.

Start and stop repeatedly until suction pressure and oil pressure are normal.

Start the discharge valve throttled in to prevent excess condenser pressure.

Start with all system valves fully opened.

Code: wA0$chNc During inspection and overhaul of a 2-stage reciprocating air compressor the main and bottom end bearing shells are found to be heavily scored with parts of the overlay and bearing metal breaking away. The crankshaft pins are found to have only very light surface scratches. Which of the given options is the best action to be taken to remedy the problem?

Replace the bearing shells with new spares after cleaning out the crankcase and refilling with clean oil.

Clean up the bearing surface and crankshaft pins with scrapers and grinding paste and refit them. Refill the crankcase with clean oil.

Refit the shells and refill the crankcase with clean oil and run the machine so that the bearings wear themselves back in.

Replace the bearings shells and crankshaft with new spares and refill the crankcase with clean oil.

Code: 5Hx#xBal During inspection of the cylinder cover from a medium speed diesel engine cylinder it is noted that cracks have occurred between the two exhaust valve pockets and the fuel injector pocket. Select from the given options the most probable cause of this type of failure.

Excessive maximum pressure in the cylinder due to engine overload.

Excessive thermal stress due to insufficient cooling of the cylinder cover.

Fuel impingement on the cover due to distorted injector nozzle holes.

Excessive tightening of the fuel injector in the pocket.

Code: N2mphYFr Which of the following options would be a typical differential pressure setting for a main engine slow down in the event of jacket cooling water system low flow?

0,2 to 0,5 bar.

1 to 2 bar.

5 bar.

10 bar.

Code: fBLP$k0Q Which of the following equipment is responsible for reducing power factor of ship system?

Resistance bank.

Induction motors.

Electrical switchboard.

Synchronous motor.

Code: D9$ghZ8q A 3-phase cage rotor induction motor requires protection by a time delay overload trip. What is the reason for this?

It will allow for inrush current or motor specific faults.

It will tolerate fault conditions during start up.

Fuses act too quickly.

Fuses act too slowly.

Code: 0D1oUpPv A 250V contactor has been fitted to a 220V supply. Which of the following symptoms might be observed?

Contactor overheating.

Contactor wont operate.

Contactor chattering (vibrating).

Contactor constantly on.

Code: XcKUJeZv Which of the following terms is used to describe a thermodynamic process in which no heat transfer into or out the system occurs?

Polytropic.

Isothermal.

Isochoric.

Adiabatic.

Code: MchTHLoD During inspection of the crank bearing for one of the units in the main engine, the bearing shell was found as follows. Surface of the white metal was black and very hard. Patches of black incrustations have worn grooves in the journal. What is the likely cause of this condition?

Water present in the lubricating oil during service.

Dirt particles in the lubricating oil during service.

Poor casting of bearing shell white metal lining.

Bearing shell service time exceeded.

Code: Qew9iD3d Why is it important to have good a relationship between the crew on board a vessel?

It leads to better work performance and positive atmosphere among the crew.

Crew comes to know each others problems.

It encourages crew to extend their contract.

It will prevent accidents from happening.

Code: cBQqHJ4K The best way to prevent stowaways from boarding your ship is to:

Search the ship when you arrive at port and again just after leaving.

Seal spaces that are not in use while in port, and perform a search of the ship before leaving.

Conduct routine, but irregular searches of the ship.

Conduct a Nominated Officers search.

Code: R6zIMGP2 For some time the remote reading temperature gauge for the meat room has been reading a higher temperature than the local liquid in glass thermometer. When removed and tested the remote gauge is found to be reading accurately. Which of the options given is the most likely cause of this discrepancy?

The sensing bulb for the remote gauge is placed in a relative "local hot spot" inside the meat room.

The lagging for the capacity tube from the sensing bulb to the temperature gauge outside of the meat room is too thick causing the tube to heat up.

The liquid in glass thermometer is positioned in a relative "cold spot" in the meat room.

The liquid in glass thermometer is reading incorrectly.

Code: qoWhiSrR Where is the Safety Certificates for ships to be kept?

In the Captain's safe.

Posted up in a prominent place onboard the ship.

In the Captain's office.

In the Owner's office.

Code: b83zBi$Q To avoid overbunkering and oil spill, it is very important that we closely monitor the progress of the bunkering operation. What is the safest method to use to minimise the risk of overflow and spillage?

Continuously monitor remote gauge readings and confirm with regular sounding of the fuel tanks.

The remote gauge system will provide us with the necessary information.

Use the predicted loading rate to calculate how much oil is being received.

Open all the bunker tank lids to manually watch them filling.

Code: qObei4yC Which personnel must undergo familiarization training on board?

Everyone.

Only the deck officers.

Only the ratings.

Only catering staff.

Code: 9TxolNIS A vessel which normally operates with the engine room in UMS mode is unable to do so because of defects to some of the critical alarm functions. What are the main considerations that the Chief Engineer must take into account when planning alternative arrangements to cover the engine room requirements until the defects are cleared?

A work rota is established to ensure that the necessary repairs can be carried out as soon as possible.

A work rota is established to ensure full coverage of engine room watchkeeping duties and adequate rest periods for the engineering staff.

A work rota is established to ensure at least one person is in the engine room at all times while the defects exist.

Code: x#qKYLY7 During test and/or maintenance work of the CO₂ system affecting the release system, precautions to ensure that the gas is not released into the engine room due to a mistake are to be ensured. What precautions should be taken?

The main supply line to be blanked off prior to the work.

Check the main valve for a potential leakage.

Arrange a watchman in the CO₂ central.

Code: pxVNHgTC A portable oxygen analyser for use onboard ship is of the paramagnetic sensing element type. It is being used to test the atmosphere of a space onboard ship but starts to give erratic readings. There is no obvious indication as to why this is happening. Select from the options given the most likely cause of this problem.

Nitrogen gas is presented in the atmosphere.

The sampling filter is blocked preventing gas from entering the sampling chamber.

The sampling filter is partially blocked giving rise to wide pressure variations in the sampling chamber.

The battery power is low.

Code: 8hHawFDR The Training Manual shall contain instructions and information on the life-saving appliances and the best method of survival. The training manual shall contain detailed explanations of crew duties in relation to emergency situations. Which of the following tasks or duties shall be included in the manual according to present regulations?

The use of the ship's line throwing apparatus.

The use of escape routes and other escape methods.

The use of surface to air visual signals to be used by survivors.

The use of navigational equipment for survival crafts.

Code: qwEKz8pv When checking the cylinder pressures of a 6 cylinder medium speed diesel engine it is found that one of the cylinders has a high maximum pressure. What is the most likely cause of this?

Fuel timing to that cylinder too far retarded.

Fuel pressure to the engine is too high.

Exhaust valve on the cylinder with the high pressure is leaking.

Fuel timing to that cylinder too far advanced.

Code: BNihNhaR Most fuel oil separators working on the centrifuge principle have an automatic start up and sludging facility. Which of the following actions would you expect to occur first during the start up sequence?

Operating water supplied to bowl to close it.

Sealing water supplied to bowl to prevent carry over.

Operating water drained from bowl to open it.

Fuel oil supplied to bowl to fill it.

Code: #5YOkGZ7 A dynamic test of the winch brake with a proof load equal to 1,1 times the weight of the survival craft or rescue boat and its full complement of persons and equipment should be carried out:

Every 3 years.

Every 10 years.

Every 5 years.

Every year.

Code: rkjnS7Kq A refrigeration plant is short cycling even though there is plenty of refrigerant in the system and all of the rooms are above temperature. From the options given select the one which is the most likely cause of the problem:

Blocked filter drier causing the automatic low pressure cut out to operate.

Ice formation in the meat room evaporator coil causing the automatic low pressure cut out to operate.

Low oil level in the sump causing the automatic low oil pressure cut out.

Code: HL$WN8al What is the alcohol in the blood permissible under US legislation before it is defined as intoxication?

0,1 %.

0,01 %.

0,04 %.

0,07 %.

Code: NpHuEDqS Which of the following options is the most likely to result in the maximum cylinder pressure for all cylinders on a diesel engine to be lower than normal?

Poor quality fuel.

A worn fuel injector.

A leaking exhaust valve.

Camshaft timing advanced.

Code: #AM4vjDq The coil of a 12V, 120mA DC relay must be connected across a 24V supply. What action should be taken?

Install a 100 ohm resistor in parallel with the coil.

Install a 100 ohm resistor in series with the coil.

Install a 100 k ohm resistor in parallel with the coil.

Install a 100 k ohm resistor in series with the coil.

Code: FfAiswVT Flow irregularities in pipes are not caused by:

Straight pipe.

Restrictive valve.

Throttling valve.

Elbow pipe.

Code: wG4J77m3 A low exhaust temperature in one cylinder of a diesel engine is noticed during routine checks. Which of the options given is the most likely cause of this?

Some of the nozzle holes of the fuel injection valve are blocked.

Injection valve opening pressure is too low.

Charge air pressure is too high.

Problem with the fuel quality or supply to the engine.

Code: uNi88zra When should a crew member joining a ship for the first time be given some training and instructions in the use of the ship's fire-fighting appliances?

As soon as possible but not later than 24 hours after he joins the ship.

As soon as possible but not later than 2 days after he joins the ship.

As soon as possible but not later than 2 weeks after he joins the ship.

As soon as possible.

Code: ApWmEk8j Can a ZENER BARRIER be installed in a hazardous area?

No, as only the output from the barrier is intrinsically safe this is not allowed.

Yes, that's what the zener barrier is made for.

Only in equipment operating on very low voltage.

Only if properly marked for such installation.

Code: zWkCMFQl What is meant by dead ship condition?

Condition under which the main propulsion plant, boilers and auxiliaries are not in operation due to absence of power.

Condition under which ship as a whole is in working order and functioning normally.

Condition under which any services needed for normal operational and habitable conditions are not working due to absence of main power.

Condition under which services needed to provide minimum living conditions are not working.

Code: 1gy5FV7t The majority of conversions adopted under the auspices of IMO fall into which of the three main categories:

Maritime Safety, STCW, Maritime Security.

Maritime Safety, Prevention of Marine pollution, Liability and compensation.

Safety, Terrorism, ILO.

There are no conentions that fall under IMO.

Code: I0NHH8Oc When bunkering through the port side of the bunker manifold what action should be taken with the valves on the starboard side of the manifold prior to bunkering operations commencing?

Blank flanges should be fitted to the closed starboard side manifold valves.

Just fit the blank flanges then it doesn't matter if the valves are closed or not

The blank flanges should be removed from the starboard side manifold valves to check for any leakage past the closed valves.

Just check that the valves are closed.

Code: ZCYPCMTx A vessel's main propulsion system consists of a pair of medium speed diesel engines driving a single controllable pitch propeller through clutches and coupled through a reduction gearbox. What is the preferred sequence to follow when going from two engine to single engine operation? Assume engine A is to be stopped and engine B is to continue running?

Stop engine A and check that clutch automatically disengages and governors for both engines operate correctly for testing purposes.

Pitch to zero thrust, reduce speed to idling speed, disengage clutch of engine A, increase speed of engine B and propeller pitch as required. Stop engine A after suitable cooling period.

Disengage clutch of engine A. Stop engine A after a suitable cooling period.

Pitch to zero thrust, disengage clutch of engine A, increase speed of engine B and propeller pitch as required. Stop engine A after a suitable cooling period.

Code: 4TqKDYMS Spray painting has been carried out in the engine room while the engine was running, and the turbocharger intake filter was not protected. Which one of the options given is most likely to result from this?

Scavenge air pressure lower than normal.

Exhaust gas temperature lower than normal.

The revolution of the turbocharger lower than normal.

Scavenging air pressure is higher than normal.

Code: d8l6k$SW When work must be done on High Voltage equipment, it is vital that the equipment is earthed (grounded) after isolation procedures have been carried out. Why is this so?

To ensure that no energy remains in the system and that it cannot be recharged by external influences.

To ensure that it is dead, even if there was a flaw in the isolation procedure.

To provide a reference point, and so ensure accuracy of any test results.

To ensure that the equipment does not overheat due to currents circulating through earth (ground).

Code: OfiJ9VEP A high speed diesel engine has been subject to a major overspeed incident due to governor failure. During checks for damage it is found that some of the bottom end bolts have slackened off slightly. There appears to be no other damage to any of the bearings, the running gear or to the crankshaft. From the options given select the action to be taken before bringing the engine back into service.

Renew all of the bottom end bolts that were found slack.

Retighten the bottom end bolts that were slack back to the recommended torque.

Renew all of the bottom end bolts.

Renew all of the running gear for the engine including the crankshaft and bearings.

Code: Dc8rGY9M The engine turns over normally when starting air is supplied but does not fire even though normal starting rpm is achieved. What could be the probable cause to this?

Air in the fuel oil system.

The turning gear interlock has operated.

The turbocharger has not run up to normal full speed.

The lubricating oil temperature is low.

Code: w1aaC4XC A plate type heat exchanger in a central cooling system has seawater leaking around the edges of some of the titanium plates. After inspection and reassembly following the manufacturer's instructions the problem still exist. What action, from the options given, should be taken to rectify the problem?

Fit new gaskets to the each of the plates.

Reduce the pressure of the sea water.

Scrap the plates and replace with a new plate stack.

Keep tightening the plate stack until the leakage stops.

Code: j6VYwUkc Medium and high speed diesel engines used for electrical generation duties on board ship have overspeed protection devices fitted to protect the engine in case the electrical generator trips while carrying high loads. Why are these devices necessary?

To stop the engine before any serious damage occurs due to rapidly changing thermal load.

To stop the engine before any serious damage occurs due to rapidly changing cylinder pressures.

To stop the engine before any serious damage occurs due to excess inertial loads.

To stop the engine before any serious damage occurs to the electrical components due to excess voltage and frequency.

Code: cjhkc0lg The operating mode of a pyrotechnic signal depends essentially on:

Instructions or diagrams printed on its casing by the manufacturer.

A definite standard process.

The weather conditions of the movement.

The fact that the user is on board a liferaft, a lifeboat or ship.

Code: IX375QjW Electric arc welding is to be carried out in the machinery spaces other than the workshop. Which of the alternatives below would be the preferred method for the connection of the "return" cable to the welding set?

Use a "go and return" system with the return cable connected directly from the welding set to the work piece if possible.

Have a short length of cable permanently connected to the ships structure close to the welding set.

Move the welding set to the welding site.

Weld a stud bolt close to the work piece and connect the return cable to this.

Code: y1yzN1Pe When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?

100 % output is accurate, but Zero-point is wrong.

Zero-point and 100 % are correct, but not at mid-range.

Zero-point is accurate, but 100 % input is not giving 100 % output.

Linearity problems.

Code: MtSjhqFI What should be the healthy continuity resistance of a 220V, 2,2kW, 10A heating element, when checked near to it's rated operating temperature?

22 Ohms.

220 Ohms.

10 Ohms.

0,1 Ohms.

Code: aLantBoK The muster list shall show the duties assigned to the different members of the crew. Which of the given duties necessarily have to be included in the muster list?

Clearing escape routes.

Preparation and launching of survival crafts.

Type of fires that can be encountered on board.

Preparation and starting of emergency generator.

Code: 7i3ruVsE Some ships generate electrical power at 440 Volts, but then step up this voltage to supply specific electrical equipment. One common example, may be to feed a large bow thruster. Why is this done?

A large bow thruster will draw very large currents at low voltage. Being typically remote from the generator, significant voltage drops would occur at low voltage.

The shipyard could not purchase High Voltage generating plant at the time of manufacture, so they used what was available at the time.

The overall ship's electrical load does not justify High Voltage generating plant. This method allows more power to be delivered to the bow thruster at low running cost.

Manufacturers can supply High Voltage bow thrusters at less cost, and the power factor is improved.

Code: fdL2yBMu Why shall a duly qualified officer supervise any potential polluting operation?

To restrict pollution.

To relieve the master.

To avoid pollution.

To inform the authorities.

Code: op7sFdlv A medium speed diesel engine is used to drive a controllable pitch propeller through a suitable clutch and reduction gearbox. What should the propeller blade attitude normally be after the engine is started and before the clutch can be engaged?

The blades should be in the zero pitch position.

The blades should be in 20 % pitch position.

The blades should be in the full astern position.

The blades should be in the full ahead position.

Code: Z6gJnPCQ The pyrotechnics used to transmit visual signals to other vessels, boats or aircrafts are of the following type:

Rocket parachute flare.

Buoyant smoke signal.

Hand flare.

All of the below mentioned.

Code: 32NTvj0X What is the best method for ensuring that the cylinder powers of a high speed diesel engine, fitted with a monoblock multi-cylinder fuel pump, are correctly balanced?

Have the fuel pump phased and calibrated in a test workshop.

Check the exhaust temperatures on each cylinder to see if they are equal.

Measure the maximum pressure of each cylinder to check that they are equal.

Take a set of indicator cards using a mechanical indicator and calculate the cylinder powers.

Code: sCLJHJbr A two step controller (open/close) has failed and the only available spare controller is a P+I controller. Select, from the options given, how the P+I controller could be set up to achieve approximate two step control.

Set the proportional band to maximum width and the integral action to minimum (repeats per minute).

Set the proportional band to minimum width and the integral action to minimum (repeats per minute).

Set the proportional band to minimum width and the integral action to maximum (repeats per minute).

Set the proportional band to maximum width and the integral action to maximum (repeats per minute).

Code: sNNizt9t A medium speed diesel engine which is supported on a steel chocking system has had repeated problems with two of the chocks at the end of the engine on the port side becoming slack. This has led to some fretting damage to the bedplate and tank top in that area. What action should be taken to affect a cost effective permanent repair?

Tighten the holding down bolts in that area to 150 % recommended load to prevent further slackening and fretting.

Replace the complete steel chocking system with one using resilient mounts to accommodate movement and avoid further incidents of fretting.

Replace the damaged chocks with resin based chocks of an appropriate size.

Replace the complete steel chocking system with a resin based system.

Code: adeCZsDs The cold room temperature is almost at the cut out point in a vapour-compression refrigeration system. What should the refrigerant state be just after the evaporator if the system is correctly set up?

Wet vapour at high pressure.

Cold liquid at high pressure.

Sub-cooled liquid at low pressure.

Slightly superheated low pressure gas.

Code: k32bmRKf The main propulsion diesel engine is normally started by direct admission of compressed air. Which one of the following statements is correct?

A heavily leaking starting air valve may cause an explosion in the starting air pipe system.

The starting air admission should continue until the engine has fired.

If the engine does not turn when the starting air is applied the turning gear can be used together with starting air to start the engine.

If the starting air pressure is too low a pressurized oxygen bottle from the welding equipment can be used for an emergency start of the engine.

Code: aCilgZbx Who is responsible for ensuring that your ship's security plan meets the requirements of the ISPS Code?

Recognized Security Organization.

Flag State Administration.

Company Security Officer.

Ship Security Officer.

Code: #TTBaZCF What does ISM stand for?

The International Management Code for the Safe Operation of Ships and for Pollution Prevention.

International Ship Measurement and Pollution Control.

International Safe Manning Certification.

Internal Ship Safety Management.

Code: #HJ2AG$E What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?

Impact pressure forces in way of abrupt or flared bow.

Forces created by waves on the forecastle.

Slamming in way of flat bottom forward of light draught.

Pressure forces caused by green water on deck.

Code: #1rKoZaR In tanker operations, there will be some areas and zones where flammable or explosive vapour, gas, or dust may be expected. Such areas are classified as hazardous. What is meant by hazardous area Zone 1?

Flammable mixture is continuously present or present for long periods.

Flammable mixture is not continuously present, but will be present during normal operations.

Flammable mixture is not present at all times.

Flammable mixture would not normally be present or it would be present for a short period only.

Code: el65izDX During maintenance work on the main engine a problem arises regarding the lifting of a main component in that the manufacturer's instructions ado not apply to the engine as fitted and present a hazard. In which of the information/record sources given in the options, is it most important to record the information relating to this anomaly?

ISM procedures in the ship's safety manual.

Safety officers report.

Engine room planned maintenance schedule.

Engine room log book.

Code: 44K1H6U7 A transformer overheats while taking a shore supply. Which is the likely cause?

Incorrect frequency.

Incorrect current.

Incorrect voltage.

Incorrect earthing.

Code: Qd3cEesB Which of the following symptoms would indicate that the filter drier in a refrigeration circuit has become blocked?

A large temperature drop across the drier.

A hammering noise from the compressors.

A hammering noise from the drier.

A pressure rise before the drier.

Code: Zsq6eai0 The main engine is running steady with an average exhaust gas temperature of approximately 350 °C. What would be a typical alarm/slow down setting for the cylinder exhaust gas temperature deviation from the average?

+/- 50 °C.

+/- 10 °C.

+/- 30 °C.

+/- 80 °C.

Code: 84Ry1B6W A vessel is installed with Power Management System (PMS). If there is an increase overload or fault in a running generator, what will the PMS do?

It will activate the Public Alarm system and shut down the generator instantly.

It will activate the emergency generator to share load or take over load of the faulty generator.

It will shut down auxiliaries system in the emergency switchboard.

It will automatically start the next generator in the start sequence.

Code: 9gmCC7J8 What is usually the effect on G when the ship is damaged below the waterline, with water ingress?

It lowers.

It rises.

It is unchanged.

It first rises then lowers.

Code: uJM2yNko Which of the given options for the value of differential pressure across a lubricating oil filter for a medium speed diesel engine would indicate that the filter required cleaning?

1,0 Bar.

0,2 Bar.

4,0 Bar.

Zero.

Code: Lj9ruoVN What would the results of a TAN test, carried out on lubricating oil samples from a diesel engine, indicate?

A measure of the organic and inorganic acids in the lubricating oil.

A measure of the organic acids in the lubricating oil.

A measure of the inorganic acids in the lubricating oil.

A measure of the remaining alkalinity in the lubricating oil.

Code: WTIBne7H During inspection and overhaul of a 2-stage reciprocating air compressor the main and bottom end bearing shells are found to be heavily scored with parts of the overlay and bearing metal breaking away. The crankshaft pins are found to have only very light surface scratches. Which of the given options is the best action to be taken to remedy the problem?

Replace the bearing shells with new spares after cleaning out the crankcase and refilling with clean oil.

Replace the bearing shells and crankshaft with new spares and refil the crankcase with clean oil.

Refit the shells and refill the crankcase with clean oil and run the machine so that the bearings wear themselves back in.

Clean up the bearing surface and crankshaft pins with scrapers and grinding paste and refit them. Refill the crankcase with clean oil.

Code: Mj41lDf0 When checking the cylinder pressures of a 6 cylinder medium speed diesel engine it is found that one of the cylinders has a high maximum pressure. What is the most likely cause of this?

Fuel timing to that cylinder too far advanced.

Fuel pressure to the engine is too high.

Fuel timing to that cylinder to far retarded.

Exhaust valve on the cylinder with the high pressure in leaking.

Code: Wmrfl5MI Which cell voltage is required to trickle charge a lead acid battery?

2,15 V.

1,2 V.

2,5 V.

2,0 V.

Code: q$ucaVzT What should be the healthy continuity resistance of a 220 V, 2,2 kW, 10 A heating element, when checked near to it's rated operating temperature?

22 Ohms.

0,1 Ohms.

220 Ohms.

10 Ohms.

Code: N3fYpE8x A refrigeration plant is short cycling even though there is plenty of refrigerant in the system and all of the rooms are above temperature. From the options given select the one which is the most likely cause of the problem?

Blocked filter drier causing the automatic low pressure cut out to operate.

Ice formation in the meat room evaporator coil causing the automatic low pressure cut out to operate.

Insufficient cooling water flow through the condenser causing the automatic high pressure cut out to operate.

Low oil level in the sump causing the automatic low oil pressure cut out to operate.

Code: LP1vqJfd What is the normal slow down/shutdown temperature for the jacket cooling water outlet from a diesel engine cylinder?

95-98 °C.

85-88 °C.

105-108 °C.

75-78 °C.

Code: ECgpdoQR The line voltage of a three phase system is 440 V. What is the phase voltage?

254 V.

147 V.

110 V.

311 V.

Code: h9zYDSVo Poster or signs shall be provided on or in the vicinity of survival craft and their launching controls. Which one of the following requirements has to be included?

Give relevant instructions and warnings.

Give an overview of location of all lifesaving appliances.

Give information on survival craft speed and seaworthiness.

Give information on survival craft capacity.

Code: o2olh#fw Check the items that can be a possible threat:

All alternatives.

Piracy, Hijacking and Smuggling.

Bombing and Sabotage.

Cargo tampering and Stowaways.

Code: NtfLitCD The circuit consists of a voltage source V, a change-over switch S, a resistor R and a capacitor C. The voltage/time figures 1 to 4 show changes in the voltage V(C) when the switch S is suddenly shifted from position 1 to 2 at time t = 0. Only one of the diagrams is correct. Which?

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Code: NtfLitCD From the options given, choose the one most likely to result in a high exhaust gas temperature in one cylinder of a four stroke diesel engine.

The inlet and exhaust valve tappet clearance is incorrect.

Clogged nozzle holes in the fuel injection valve.

Faulty turbo charger.

Fuel injection valve opening pressure set too high.

Code: xqmylAUS What type of protection method does an miniauture circuit breaker (MCB) provide?

Fixed thermal overload and fixed magnetic short-circuit protection.

Fixed thermal overload and adjustable magnetic short-circuit protection.

Adjustable thermal overload and adjustable magnetic short-circuit protection.

Adjustable thermal overload and fixed magnetic short-circuit protection.

Code: wuu1J77a As per SOLAS regulations, the general emergency alarm system must be tested:

Every week.

Every month.

Every 2 weeks.

Every 3 weeks.

Code: CkKkdu8E The main propulsion diesel engine is normally started by direct admission of compressed air. Which one of the following statements is correct?

A heavily leaking starting air valve may cause an explosion in the starting air pipe system.

If the engine does not turn when the starting air is applied the turning gear can be used together with the starting air to start the engine.

The starting air admission should continue until the engine has fired.

If the starting air pressure is too low a pressurized oxygen bottle from the welding equipment can be used for an emergency start of the engine.

Code: jjtwqTaZ What is usually the effect on G when the ship is damaged below the waterline, with water ingress?

It lowers.

It first rises then lowers.

It rises.

It is unchanged.

Code: Za0AmuCC During inspection of the crankshaft of a medium speed diesel engine cracks are discovered at one of the main journal pins. The cracks originate from one of the oil holes and are progressing along the pin at approximately 45 degrees to the axis. From the options given select the most likely failure mode that would cause this.

Torsional fatigue due to excessive torsional vibration in the crankshaft.

Erosion due to excessive oil flow through the oil hole in the crankshaft pin.

Fatigue due to repeated excessive bending of the crankshaft.

Shear due to excessive loading of the crankshaft.

Code: eAW14n6J Spray painting has been carried out in the engine room while the engine was running, and the turbocharger intake filter was not protected. Which one of the options given is most likely to result from this?

Scavenge air pressure lower than normal.

The revolution of the turbocharger lower than normal.

Exhaust gas temperatures lower than normal.

Scavenging air pressure is higher than normal.

Code: i81i3N7Q The Declaration of Security:

Addresses the security requirements shared between ships or between a port facility and a ship.

Details a ship's security measures.

Identifies the security responsibilities of shipboard personnel.

States the reporting procedures to government contact points.

Code: V0H16pTp A viscosity controller for the main diesel engine fuel oil supply is giving poor control resulting in the viscosity of the fuel oil being too low at the engine. Which of the defects given in the options is likely to be the cause of this problem?

Capillary tube in the viscometer is blocked giving high differential pressure at the DP cell.

The air supply pressure to the controller for controlling the steam valve for steam to the fuel heater is too low.

The bellows in the DP cell is ruptured giving no differential pressure signal.

The drive for the internal sample pump for the viscometer has sheared.

Code: 6jqm8ekR How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?

Adjustment of the pressure relief valve to recirculate part of the flow.

By throttling the discharge valve.

Positive displacement pumps operate at constant pressure and cannot be regulated.

By throttling the suction valve.

Code: r7sOCXsg One cylinder of a diesel engine is operating with a high exhaust gas temperature. From the options given, select the one most likely to cause this condition.

Fuel injection valve opening pressure is too low.

Water leakage into the cylinder.

Cylinder lubricating oil supply rate to the engine is excessive.

The charge air is delivered to the engine at too high a temperature.

Code: DSleC50J Some new maintenance routines are being planned and a risk assessment is necessary so that the required procedures can be entered into the ship's Safety Management Manual. Which of the following should be the first step in this risk assessment process?

Identify the hazards that may exist which may affect personnel involved with the maintenance routines.

Identify the safety precautions that may be necessary to prevent injury or harm to personnel carrying out the routines.

Identify how much it will cost to implement the necessary precautions to prevent injury to personnel.

Identify who may be harmed or injured in carrying out the maintenance routines.

Code: VbBs5K2Q The Master is responsible that all crew participate in monthly emergency drills. If 25 % of the crew - or more - has not participated in such drill during the last month, what is the time limit to conduct such a drill after the vessel has left a port?

Within 24 hours.

Within 48 hours.

Within 12 hours.

Within 30 hours.

Code: TlsrZmHZ Ships of 10 000 tons gross tonnage and more, shall be fitted with oil filtering equipment, complying with Reg. 14 (7) of MARPOL for the control of machinery space bilges. What would be the maximum oil content of oily-water mixture to pass through the filter?

15 ppm.

30 ppm.

60 ppm/n. m.

100 ppm.

Code: QdKuYDui With respect to the ISM, what training in addition to lifeboat and fire drills must be carried out?

Familiarization, and other drills identified as necessary by the ship.

The boat drill and fire drill should be adequate to meet your needs.

Bridge Team Management.

Mooring operations.

Code: fpQzomzR Two identical medium speed engines are connected through clutches and a reduction gearbox to a single controllable pitch propeller. It is noted during normal operation that the load sharing between the engines is uneven with one engine taking a greater proportion of the load as the total load increases even though they are equally loaded at low load. Select from the options given the most likely cause of this problem.

The governor droop settings are incorrectly set and are not matched.

The clutch on one engine is slipping.

One of the engines is running faster than the other at high loads.

The fuel filters in the supply line for one of the engines are blocked.

Code: WXfi73YV The majority of marine diesel engines operate with either a pulse or a constant pressure turbocharging system. What is the main difference between these two systems?

Contrast pressure systems have all engine cylinder exhaust connected to a common large exhaust gas manifold.

Pulse systems have all of the cylinder exhaust connected to a common large exhaust gas manifold.

Constant pressure systems only ever have a single turbocharger irrespective of the number of cylinders on the engine.

Pulse systems always have a turbocharger for each group of three cylinders.

Code: zaCwyonp What is the best way to avoid pollution from small oil-spills aboard a ship?

Contain any oil-spill onboard the ship.

Have sawdust ready for use.

Have dispersing chemicals ready for use in case of oil-spill.

Rig an oil boom around the ship.

Code: tb13zb$e What is the purpose of the air distributor in a diesel engine air start system?

To ensure that the automatic valve in the air start system opens and closes at the correct time.

To ensure the cylinder air start valves operate in the correct sequence and for the correct period.

To ensure that the start air is distributed equally to the each of the engine cylinders.

To ensure the air consumption from each of the main air receivers is equally distributed.

Code: XsW1j0ug During test and/or maintenance work of the CO₂ system affecting the release system, precautions to ensure that the gas is not released into the engine room due to a mistake are to be ensured. What precautions should be taken?

The main supply line to be blanked off prior to the work.

No special precautions necessary.

Arrange a watchmain in the CO₂ central. .

Check the main valve for a potential leakage.

When starting air is applied to a diesel engine the engine fails to turn over but is seen to oscillate back and forth. What is the most likely cause of this problem?

One or more cylinder air start valves are stuck open.

An interlock is blocking the air to the starting air distributor.

The fuel supply is blocked.

The engine oil is too thick.

In an automatic temperature control system, operating with a PID controller, which of the following settings or parameter adjustments may result in system oscillation?

Gain too high.

Integral time set too low.

Derivative time set too high.

Proportional band set too wide.

When considering instrumentation systems, what is the meaning of the expression "dead-band"?

The controller will not react to a process change in this range.

The system is completely inactive.

The controller will overreact to small changes.

The process is running at maximum efficiency.

What does the term "stoichiometric mixture" mean when used in relation to combustion of hydrocarbon fuels?

An ideal mixture of fuel and air in which all of the fuel and oxygen in the mixture are consumed during combustion.

A ideal mixture of fuel and air in which all of the oxygen in the air in the mixture is consumed during combustion.

A mixture that contains excess fuel for combustion.

A mixture that is too rich in oxygen.

A High Breaking Capacity fuse found in a Main High Voltage Switchboard will typically have fault level rating of?

40 kA.

40 A.

10 kA.

100 kA.

The charge air pressure supplied to a diesel engine, which is normally 2,0 bar, is reduced to 1,5 bar. What will be the likely effect on the engine operation?

The performance of the engine will be reduced noticeably.

The engine will operate more efficiently.

There will be no noticeable effect on the engine.

The engine will produce more power.

The operation of a diesel engine is controlled by a mechanical-hydraulic, compensated speed sensing governor. How will the governor control be affected if the compensation needle valve is closed in and the engine load changes?

Engine speed control will be sluggish.

Altering the compensation needle valve has no effect on speed control.

The engine will respond more quickly to load changes.

The governor will become inoperative.

Medium and high speed diesel engines used for electrical generation duties on board ship have overspeed protection devices fitted to protect the engine in case the electrical generator trips while carrying high loads. Why are these devices necessary?

To stop the engine before any serious damage occurs due to excess inertial loads.

To stop the engine before any serious damage occurs to the electrical components due to excess voltage and frequency.

To improve the efficiency of the engine.

To reduce fuel consumption during operation.

Part of the outer surface of a refrigeration compressor crankcase and the refrigerant return line near the compressor ice up heavily during normal operation. Which of the options given is the most likely cause of this problem?

The superheat control setting for the thermostatic expansion valve is set too low.

The filter drier unit in the liquid line is partly blocked.

The compressor is overcharged with refrigerant.

The refrigerant return line is too long.

Prior to removing the access doors to a pressure vessel for internal maintenance it should be ensured that all pressure has been relieved. As well as a zero indication on a pressure gauge which other measure, from the options given should be taken to confirm this prior to commencing the work?

Open the drain valve while pressure still shows on the gauge and to check it is clear. Outflow should cease as the pressure gauge reaches zero.

Open the drain valve when the gauge reads zero to check that there is no outflow.

Check the temperature of the vessel to ensure it is safe to open.

Inspect the exterior of the vessel for any signs of leakage.

Some ships generate electrical power at 440 Volts, but then step up this voltage to supply specific electrical equipment. One common example, may be to feed a large bow thruster. Why is this done?

A large bow thruster will draw very large currents at low voltage. Being typically remote from the generator, significant voltage drops would occur at low voltage.

Manufacturers can supply High Voltage bow thrusters at less cost, and the power factor is improved.

High Voltage systems are easier to maintain.

It allows for the use of smaller conductors for the same power output.

A ship has a medium speed engine and a controllable pitch propeller propulsionsystem. What would the propeller pitch normally have to be at to allow startingof the engine?

Zero.

25 % ahead.

10 % ahead.

25 % astern.

After water-washing the turbocharger exhaust side it starts to vibrate even thoughit was operating normally prior to the washing procedure. What is the most likelycause of this problem?

Water drain for washing system is blocked allowing water to build up in the turbine casing.

The foundation bolts for the turbocharger are loose.

The turbocharger bearings are worn out.

The rotor blades are damaged or the blades are not properly cleaned.

Choose the option which most accurately completes the following statement. Theexpansion tank in a closed cooling water system is designed to maintain a positive head on the system and also to……

Reduce the water temperature.

Allow for changes in water volume due to temperature variation (expansion).

Reduce the water turbulence.

Provide an air cushion.

How is the effective delivery stroke of a helix type fuel pump for a diesel enginecontrolled to increase or decrease the quantity of fuel delivered?

The fuel rail pressure relief valve setting.

The fuel injector setting.

The fuel booster pump delivery pressure.

Rotation of the plunger by the fuel rack from the governor signal.

How is the temperature of the high temperature circuit of a central coolingsystem normally controlled?

By mixing with water from the low temperature circuit.

By controlling the bypass of flow for the central coolers.

By increasing the flow rate through the main engine cooling circuit.

By controlling the flow through the fresh water evaporator heating circuit.

In a diesel engine lubrication system the circulating pump normally takes suctionfrom the oil sump tank. Where would the oil normally pass to directly after the pump?

Main thrust bearing.

Lube oil cooler.

The engine bearings.

The lub oil purifier.

The exhaust gas temperatures of all cylinders of a diesel engine are seen to behigh. Select, from the options given, the most likely cause of this.

High wear rate in one of the fuel injection pumps.

One of the fuel cams is worn.

Insufficient cooling of the main bearings.

Poor fuel oil quality.

The level in a diesel engine lubricating oil sump has increased noticably duringoperation without any new oil being added. What action would you take?

Stop the engine and check for a fuel or water leak.

Continue normal operation.

Drain some oil from the engine to reduce the level.

Reduce the engine load and check for a fuel or water leak.

The lubricating oil in the bearing housing at the turbine end of a turbocharger gets very dirty after only a few hours in service. What is the most likely reasonfor this happening?

The turbine end bearing is badly worn.

The lubricating oil filling connection screw cap is missing.

Damaged rotor shaft sealing bushes allowing exhaust gas to leak into the bearing housing.

The wrong type of lubricating oil has been used.

The main engine turbocharger speed has increased during the night while operating in UMS mode. From the options given, what is the most likely cause of this?

The engine load has increased due to external factors such as current and wind.

The engine is operating on a different grade of fuel.

The engine load has reduced due to external factors such as current and wind.

The governor signal has been overridden by the bridge.

What could be the most likely reason for an increase in the viscosity of a diesel engine lubricating oil during operation?

Worn bearing shells.

Fuel oil leakage into the lub oil system.

Water-leakage into the lub oil system.

Increased lub oil temperature.

What could cause diesel engine lubricating oil to appear cloudy with a slightly \"milky\" colour?

Water contamination of the system.

Fuel contamination of the system.

High temperature of the oil.

Oxidation of the oil.

What is likely to be the cause of black smoke from a diesel engine exhaust seen at the funnel?

Too much combustion air.

Water in the fuel.

Incomplete combustion of the fuel.

Engine is burning some lubricating oil.

What is the purpose of an oil mist detector, OMD, as fitted to a diesel engine?

To detect and give an alarm and slowdown of any potentially explosive atmosphere in the crankcase.

To check the efficiency of the crankcase extractor fan.

To detect scavenge air leakages from the piston rod stuffing box.

To detect and give an alarm and slowdown in the event of a crankcase explosion.

What is the purpose of diesel engine cylinder head safety valve?

To shut off the fuel to a the cylinder in the event of a high pressure fuel pipe leak.

To shut down the engine in the event of an unsafe operating condition.

To allow adjustment of the cylinder pressure to a safe working pressure.

To indicate and relieve excessive high pressure in the cylinder to protect the engine frombeing damaged.

What is the recommended range for the pH-value for the water in a diesel engine cooling system engine cooling water be maintained?

Between 7 and 10.

Between 5 and 7.

Above 10.

Below 5.

What would be the most probable cause of light, smoky exhaust from a diesel engine?

Fouling of the charge air cooler.

Air in the fuel oil system.

The engine is overloaded.

Water carry over from charge air cooler to engine cylinders.

What would be the most probable cause of the exhaust gas temperature from one cylinder of a diesel engine being lower than normal?

The intake filter for turbo charger is partly fouled.

The camshaft chain is too slack.

The opening pressure for the injection valve for the cylinder is set too high.

There is air in the fuel oil system.

When should adjustments to the fuel injection valve spring tension be made?

During engine operation when cylinder exhaust temperatures need to be balanced.

Only on the fuel injection valve test rig.

During engine operation when cylinder maximum pressures need to be balanced.

During engine operation when fuel timing to individual cylinders needs to be adjusted.

Which of the following options would be the cause of a low exhaust temperature in one cylinder of a diesel engine?

Faulty fuel injection valve.

Faulty turbocharger.

Poor quality fuel.

Charge air cooler fouled on air side.

Which of the given options characterizes a 2-stroke diesel engine?

A 2 stroke engine always has 2 or more turbochargers.

A 2 stroke engine completes a full cycle every revolution.

A 2 stroke engine has an air inlet valve in the cylinder cover.

The piston always has a short skirt.

Which would be the most suitable point in the system to obtain a representative of diesel engine lubricating oil for analysis?

From the lubricating oil purifier outlet.

From the lubricating oil cooler drain.

From the lubricating system pipeline on the discharge side of the circulating pump.

From the lubricating oil filter drain.

Why is it necessary to have routine testing of diesel engine cooling water systems?

To ensure that the recommended levels of treatment chemicals are maintained at all times.

To detect water leakage from the system.

It is not really necessary to test diesel engine cooling water systems.

To check for oil contamination of the system.

With reference to diesel engine ancillary system operation, which one of the given statements is true?

The normal scavenge air temperature after the charge air cooler is approximately 80 to 90 °C.

The normal jacket water temperature before the jacket water cooler is approximately 80 to 90 °C.

The normal temperature of the lubricating oil before the lub oil cooler is approximately 80 to 90 °C.

The normal temperature of heavy fuel oil after the fuel oil heater is approximately 80 to 90 °C.

With reference to non-VIT diesel engine high pressure fuel pumps that have helix control, how is the timing of fuel injection normally adjusted?

By raising or lowering the pump plunger relative to the pump barrel.

By rotating the pump plunger relative to the pump barrel.

By changing the governor output signal.

By changing the opening pressure setting for the fuel injection valves.

In a circuit diagram of a simple hydraulic circuit, which of the alternatives does the following symbol indicate?

Double check valve.

Throttle valve.

Pressure relief valve.

Directional control valve.

A piston ring set for a trunk piston engine often includes a slotted ring tensioned by an internal spring. What is the purpose of this type of piston ring?

It is the lowest compression ring.

It is a ring to seal the crankcase from the combustion chamber.

It is the firing ring.

It is an oil control ring.

During the cycle of a four stroke diesel engine there is a load reversal on the bottom end bearing when the load transfers from the upper part of the bearing to the lower part. What is the main cause of this load reversal on a modern, turbocharged, medium speed diesel engine?

The suction effect on the piston during the air intake (induction) stroke.

The lack of gas load to oppose the inertial forces generated during the exhaust stroke.

The inertial forces generated during the upward strokes of the piston (compression and exhaust strokes).

The light alloy materials used for the piston skirt.

During the normal operating cycle of a diesel engine there are side thrusts generated by the piston as it moves up and down the cylinder due to the changing angle of the connecting rod. How are these side thrusts accommodated in a trunk piston engine?

The side thrust is transmitted to the cylinder liner and the engine frame by the piston rings.

The side thrust is transmitted to the cylinder liner and the engine frame by the piston crown.

The side thrust is transmitted to the cylinder liner and the engine frame by the piston skirt in way of the gudgeon pin.

The side thrust is transmitted to the engine frame by the crosshead bearing.

Many modern medium and high speed diesel engines operate at very high powerratings resulting in relatively high bearing loads. In order to accommodate theseloads the bearings are required to have a high load carrying capacity. What kindof bearings are normally used for main and bottom end purposes to achieve this?

Thin steel shells lined with aluminium tin alloys.

Thick white metal types with the white metal cast into the keeps to give extra fatigue strength.

Thin steel shells with a thin white metal lining.

Thin steel shells with a copper lead lining and a running in overlay.

Some main propulsion medium speed engine installations operate with a hydraulic oil type fluid coupling between the engine and the reduction gearbox instead of a mechanical clutch. With this type of installation a separate flexible coupling is not normally fitted. Why is a separate flexible coupling usually omitted from this type of installation?

There is insufficient room to fit a flexible coupling between the engine and gearbox when a fluid coupling is fitted.

There is natural slippage between the drive and driven parts of the fluid coupling and a flexible coupling would prevent this slippage.

There are no engine torque variations in the drive when a fluid coupling is used so a flexible coupling is not required.

The hydraulic fluid in the coupling isolates the gearbox from the engine vibrations.

The majority of medium speed main propulsion installations incorporate a reduction gearbox between the engine and the propeller shaft. Why is this arrangement usually required?

So that the engine can be more easily reversed.

So that the propeller operates in a relatively efficient speed range.

So that the engine can be coupled to a controllable pitch propeller.

So that the engine can also drive a shaft alternator.

The peak pressure (maximum cylinder pressure) is often taken as an indicator of medium speed engine performance along with other parameters. What would be a typical peak pressure for a modern, highly rated, medium speed diesel engine?

10 to 12 bar.

14 to 18 bar.

80 to 100 bar.

140 to 180 bar.

The Total Base Number (TBN) is important as a measure of neutralizing ability of a diesel engine lubricating oil against strong acids formed during combustion. What action should be taken if the results from an oil analysis show that the TBN of the lubricating oil has reduced slightly?

Pump the oil to a renovating tank and allow any contaminants to settle out and refill the system with new oil.

Take another lub oil sample and send it for analysis.

Freshen up the system by draining of some of the oil and adding a quantity of fresh oil.

Purify the system oil in a centrifuge.

What is the reason for fitting \'Rotocaps\' to the cylinder head valves of some 4-stroke diesel engines?

To extend the service life of the valves by giving even heat and wear distribution.

To rotate the inlet valves during operation to improve air turbulence in the cylinder.

To help clear the cylinder of exhaust gas by spinning the exhaust valves during opening.

To prevent seizure of the cylinder head valves by keeping the valve spindles clean.

When operating a propulsion installation consisting of medium speed diesel engines driving a controllable pitch propeller it is possible to operate the combination of engine speed and propeller pitch in a number of different ways. What would be the main reason for operating with constant speed and variable pitch?

To obtain maximum propeller efficiency over the load range of the engine.

To allow constant speed operation of a shaft generator while the engine load changes with pitch variation.

To allow the engine to be operated with a load sensing governor instead of a speed sensing governor.

To allow rapid load change and thrust reversal when manoeuvring.

Which of the given statements is true in relation to the features and operation of a 4 stroke diesel engine ?

A 4 stroke engine has an ignition towards the end of every upward stroke of the piston.

A 4 stroke engine always has scavenge ports near the bottom of the cylinder liner.

The camshaft rotates with half the RPM of the crankshaft in a 4 stroke engine.

4 stroke engines are not required to have crankcase relief valves fitted.

Which symptoms would indicate piston blow-by when operating a 4 stroke trunk piston type engine ?

Increased pressure in the crankcase and smoke at the crankcase vent.

Increased pressure in the air inlet manifold.

Increased temperature in the inlet air manifold on the engine.

Smoke and sparks from the scavenge manifold drains.

A slow speed diesel engine is fitted with a slow turning facility. How would the slow turning normally be set to operate?

It should automatically operate before every normal start sequence.

It should automatically operate every 20 minutes when the engine is stopped during manoeuvring.

It should be manually operated before the normal start sequence following an engine stopped period of more than 10 minutes.

It should automatically operate before the normal start sequence following an engine stopped period of more than 20 to 30 minutes when manoeuvring.

It should be manually operated before the normal start sequence following an engine stopped period of more than 10 minutes. In the event of a severe scavenge fire, which of the following is most likely to be seriously damaged?

Piston rod and stuffing box.

Exhaust valve.

Piston crown.

Crosshead bearing.

Large slow speed diesel engines are usually of the crosshead type and have various arrangements to deliver lubricating oil directly to the crosshead bearings and guides to ensure adequate lubrication. Why are the crosshead bearings considered differently to the other bearing in this type of engine in respect of lubrication requirements?

The lubricating oil has further to travel to the crosshead bearing and so a separate arrangement is necessary.

The running surfaces oscillate relative to each other during operation rather than rotate and therefore full film hydrodynamic lubrication is not possible.

The crosshead bearing is more heavily loaded than other bearings in the engine so requires more oil to keep it cool.

The crosshead bearing is closer to the engine cylinder and therefore runs hotter.

Many large 2 stroke marine diesel engines are equipped with an auxiliary scavenge air blower. What is the purpose of this equipment?

To assist the main turbochargers in supplying combustion air when on full load.

To allow full load running when the main turbocharger is defective.

To provide combustion air at start up, during manouevring and low load running when the turbocharger delivery is insufficient.

To help cool the engine after it has been stopped.

Many large slow speed diesel engines operating on heavy fuel oil have a fuel injection system which features Variable Injection Timing. How does this affect engine operation?

VIT increases engine efficiency by automatically maintaining the maximum cylinder pressure over part of the load range.

VIT improves engine operation by automatically controlling the start of fuel injection when it detects a poor quality fuel.

VIT increases engine efficiency by automatically maintaining the maximum cylinder pressure over the entire load range.

VIT allows the ship\'s engineers to alter the injection timing for each load setting with a simple single adjustment of the fuel rack.

Any modern large slow speed diesel engines used for main propulsion operate with a so called constant pressure turbocharging system. What is meant by constant pressure when used to describe such a turbocharging system?

Pressure variations in the scavenge air supply are avoided by supplementing the air supply with air from the auxiliary blowers so keeping a constant pressure across the load and speed range.

The exhaust pipes from groups of three cylinders are joined together before entry into the turbocharger so that the exhaust pulses from each cylinder cancel each other giving a constant inlet pressure.

The exhaust gas pressure is maintained constant by using a bypass waste gate to dump excess pressure at high engine loads.

Pressure variations at the turbocharger inlet are damped out due to the large volume of the exhaust receiver and the short lengths of pipe from individual cylinders.

Modern large slow speed diesel engines operate with very efficient turbochargers. This has resulted in much later opening of the exhaust valve as less energy is needed to drive the turbocharger giving exhaust timing which is almost symmetrical about bottom dead centre. How has this affected the reversing operation of the engines?

It has no effect and the reversing requirements of the engine are still the same.

Only the fuel and starting air timing needs to be changed to reverse the engine.

The engine can be reversed by simply repositioning the main camshaft.

Only the air start distributor has to be repositioned prior to reversing the engine.

Modern slow speed, two stroke diesel engines often have locating pins or pegs to keep the piston rings in a fixed position. Why is this arrangement used?

It avoids the risk of the ends of the piston rings being forced out by the gas pressure and catching on the scavenge ports.

The piston rings are more difficult to lubricate because of the slow operating speeds and will wear more quickly if they are allowed to rotate.

The piston ring gaps can be kept in line to control the gas pressure on each of the rings.

It ensures the rings cannot be mixed up and that they are fitted in the correct order on the piston.

The majority of large slow speed diesel engines used for main propulsion purposes are direct drive to a fixed pitch propeller? What is the main reason for this arrangement?

Controllable pitch propellers cannot be used with large slow speed diesel engines which can be reversed.

The amount of power that needs to be transmitted would overload a gearbox.

There is usually only one engine sin this arrangement and so clutches are not required.

A fixed pitch propeller can operate with reasonable efficiency at the same sort of speed as the engine.

What is one of the main features of the cylinder lubricating oil used in large 2 stroke marine diesel engines which normally operate on heavy fuel oil?

It is strongly alkaline.

It is strongly acidic.

It is neutral with a pH value of 7.

It is a pure mineral oil without any special additives.

What is the main reason for sometimes having a separate forced lubrication system for the camshaft on large cross head engines?

Because the camshaft system uses a different grade oil from that used in the main lubrication system.

To prevent the camshaft system being contaminated with any water leaking into the main lubrication system from faulty cylinder liner seals.

To prevent any fuel leakage from the high pressure fuel pumps contaminating the oil in the main lubrication system.

Because the camshaft lubrication system has a lower pressure than the main lubrication system.

Why is it important to check the timing of diesel engine cylinder oil lubricators?

To ensure cylinder lubricating oil enters the cylinders when the piston is in the required position.

To ensure the correct amount of cylinder lubricating oil is fed into the cylinders.

To avoid excess pressure in the cylinder lubrication system.

To ensure the piston is not covering the lubrication points and blocking the flow of cylinder lubricating oil into the cylinder.

Boiler water tests on a low pressure steam boiler show the chloride content to be 50 ppm. What action should be taken if any?

Increase the dosage of treatment chemicals.

Blow down the boiler and reduce the dosage of treatment chemicals.

Shut down the boiler and drain the water out before filling with fresh feed water.

No action is necessary.

Feed check valves for the main and auxiliary boilers are normally of the double shut off type with one screw lift valve and one screw down non-return valve. What is the main function of the non-return valve?

To allow overhaul of the screw lift valve when the non-return valve is shut and the boiler is steaming.

To prevent the steam and water in the boiler from discharging out through the feed line if the feed line fractures or a joint in the line blows.

To prevent back pressure on the boiler feed pump.

To allow fine tuning of feed water flow to the boiler.

From the statements given in the answer options, choose the one which is most accurate in relation to the operation of water-tube boiler and fire-tube boilers.

A firetube boiler has a much better capability to work at higher steam pressure.

A watertube boiler can tolerate a short period of time without any water when the burner is operating.

Water-tube boilers are more efficient and generally contain less water than fire tube boilers. They are prone to major damage when run dry during operation.

A firetube boiler does not require a non-return valve in the feedwater line.

How often should boiler water tests be carried out on a steam boiler?

Every week.

Every hour.

Every day.

Tests on the water in a low pressure boiler show the chloride level is 500 ppm. What action should be taken?

Blow down boiler and check the condenser for leakage.

Increase dosage of treatment chemicals.

Increase feed water temperature.

Decrease dosage of treatment chemicals.

Under what load condition would soot blowing of the boiler tubes be most beneficial?

When the boiler burner is off.

When the boiler is firing on low rate.

When the boiler is firing on medium rate.

When the boiler is firing on high rate.

What action is required if boiler water tests confirm a pH value of less than 9?

Blowdown the boiler and refill with good feedwater.

Increase the dosage of alkalinity treatment chemicals until the pH value is back within normal range.

No action is required.

Reduce the dosage of alkalinity treatment chemicals until the pH is back within normal range.

What action should be taken if the boiler water tests show that the pH-value in the boiler water is slightly over 11.5?

Blowdown the boiler and decrease the dosage of boiler water treatment chemicals.

No action is required this is the normal level.

Blowdown the boiler and Increase the dosage of boiler water treatment chemicals.

Raise the boiler water level above normal to dilute the contents.

What is an effective means of measuring the total dissolved solids in boiler water?

Alkalinity test.

Chloride test.

pH test.

Conductivity test.

What is the correct range for the pH-value for the water in an oil fired steam boiler?

9 - 11.

4,5 - 7.

Below 4.5.

7 – 9.

What is the main problem associated with oil in a steam boiler water system?

It causes corrosion of steel in the boiler.

It forms an insulating film on heat transfer surfaces with the risk of overheating.

It increases scale deposits in the boiler.

It causes the gauge glasses to become dirty preventing the operator from seeing the water level.

What is the main purpose of having a deaerator in a boiler feed water system?

To provide a dosage point for feed water treatment.

To reduce the total dissolved solids in the feed water.

To remove oxygen and other dissolved gases from the feed water.

To act as the primary feed heater.

What is the main purpose of the super heater vent valve on a high pressure steam boiler?

To ensure a flow of steam through the superheater when raising steam pressure or when the boiler is not on-line.

To remove air from the superheater.

To remove water from the superheater.

To control the superheater pressure during operation.

What is the potential effect on a steam boiler of having calcium based compounds present in boiler water and proper water treatment is not carried out?

It will form passive layers on the metal surfaces in the boiler.

It will reduce the TDS in the boiler.

No negative effects are likely.

It will cause corrosion and scale deposits in the boiler.

What is the purpose of a scum valve often fitted to a steam boiler?

To allow removal impurities from the boiler feed- water.

To allow removal of sludge and mud which may collect in the bottom of the boiler water drum.

To allow removal of oil from the surface of the feed water tank.

To allow removal of any oil or impurities which collect on the surface of the water in the boiler steam drum.

What is the purpose of an economizer as often fitted in a steam boiler plant?

To heat the feed-water.

To desuperheat the steam.

To heat the fuel oil.

To heat the combustion air.

What is the purpose of refractory linings in an oil fired steam boiler furnace?

To give added strength to the furnace.

To prevent excessive furnace heat losses and protect tubes and other fittings from overheating.

To support the steam drum.

To ignite the burner during automatic operation.

What is the purpose of the flame scanner or \'magic eye\' fitted to the burner unit of oil or gas fired steam boilers?

To check the colour of the flame.

To control the combustion air supply to the boiler.

To check that the flame is present during start up or normal operation of the burner; if not then fuel is shut off automatically.

To check the colour of the exhaust gas from the furnace.

What temperature should a water sample be at before carrying out boiler water tests?

At room temperature.

As hot as possible.

It makes no difference.

At less than room temperature.

What would be the effect of a faulty steam trap on a fuel oil heater causing condensate to build up in the heat exchanger?

An increase in fuel oil temperature.

Excess pressure on the shell of the heat exchanger.

Low water level in the boiler.

Reduced heating capacity of the heater.

Where should a sample for boiler water test purposes be taken from?

From the boiler water space.

From the boiler steam space.

From the boiler feed system.

From the blowdown line.

Which part is the spindle house?

Number 1.

Number 4.

Number 2.

Number 3.

Which part is the exhaust gas receiver?

Number 8.

Number 7.

Number 6.

Number 1.

Which part is the exhaust valve?

Number 1.

Number 2.

Number 4.

Number 6.

What is part number 3?

The air chamber.

The combustion center.

The piston glider.

The combustion chamber.

What is part number 5?

The air cooler.

The air filter.

The air receiver.

The scavenging air box.

What is part number 8 called?

The cooler inlet.

The air cooler.

The air filter.

The air box.

Which part is the turbine wheel?

Number 4.

Number 8.

Number 7.

Number 9.

Which part is the auxiliary fan?

Number 10.

Number 7.

Number 9.

Number 6.

That is part number 11?

The blower.

The turbine outlet.

The turbine wheel.

The blower ring.

The turbine wheel number 9 is made to rotate by:

exhausts coming from the combustion chamber.

pressured air supplied by blower number 10.

any of the above.

inlet air coming from the inlet filter.

What liquid is used to clean the turbo charger of a large low speed main engine?(high speed air side, half speed gas side)

Oil.

A chemical mixture of oil and water.

A chemical mixture of acid and water.

Water.

The force tending to twist the material such as the force on a shaft is called:

tensile stress.

torsional stress.

bending stress.

compressive stress.

What is the purpose of counterbore in a cylinder?

To prevent the piston ring from wearing a shoulder in the cylinder.

To facilitate piston overhaul.

To distribute the oil film evenly over the cylinder surface.

To have good an effective combustion.

Clearing a cylinder of exhaust gases by forcing in a current of air which provides clean air for the next compression stroke is called ………

cycle.

scavenging.

expansion.

compression.

The last stroke of two-stroke diesel engine is called the ………

air stroke.

compression stroke.

power stroke.

ignition stroke.

If the cooling water temperature goes below its recommended value, what can happen ?

Condensation of sulphuric acid on the cylinder walls.

The fuel pumps may be clogged.

Condensation of lubricating oil on the cylinder walls.

The engine cannot be started again.

If the cooling water temperature exceeds its recommended value, what can happen ?

The blower will slow down.

A less effective lubricating oil film is formed on the cylinder walls.

The expansion tank will be emptied.

Too much lubricating oil film will form on the cylinder walls which will create black exhaust smoke.

Which mode of automatic temperature control is used for this Jacket Cooling Water system?

Keeping outlet temperature constant by regulating on the outlet.

Keeping outlet temperature constant by regulating on the inlet.

Keeping inlet temperature constant by regulating on the inlet.

Keeping inlet temperature constant by regulating on the outlet.

What is item \"J “?

The Piston Cooling Water Pump.

The Sea Water Cooling Pump.

A Water Strainer.

The Jacket Cooling Water Pump.

What kind of Jacket Cooling water system is shown here?

A forced circuit.

None of the above.

A free closed circuit.

An open circuit.

What absorbs the impact of the up-and-down movement of the piston telescopic pipes in this water flow system ?

The air cushion in the buffer tank.

The construction of the buffer tank.

The up and downward movement of the indicating flaps.

The expansion tank.

If the system pressure is 3,5 kg/cm², what will be the pressure in the buffer vessels?

Fluctuating around 3,5 kg/cm².

Lower than 3,5 kg/cm².

Exactly the same, 3,5 kg/cm².

Higher than 3,5 kg/cm².

Why there an indicating flap \"IF\" (shown with arrow up and arrow down) fitted on the outlet of the piston water buffer tank ?

To indicate if the pump mis-running.

To indicate that the engine is running.

To indicate that the buffer air in the system is in order.

To indicate that buffer air and water flow are in order.

What will happen to the level of the expansion tank if the engine slows down or stops ?

The level will at first decrease but increases again.

Nothing will happen.

The level will increase.

The level will decrease.

How are the crosshead bearings supplied with lubricating oil?

Via the main bearing, crankshaft, bottom end bearing and connecting rod.

Direct from the lub oil main line.

Independently.

From the camshaft lub oil line.

How is the gear train lubricated?

Via the crankshaft.

Via the camshaft system.

Direct from the common lub oil circuit.

By its own independent lub oil circuit.

Flow is the thrust bearing lubricated?

Via the camshaft.

By its own independent supply system.

Via the crankshaft.

Direct via the main lub oil line.

Which of the following components is NOT directly lubricated by the lubricating inlet supply line?

The gear train.

The trust bearing.

The crosshead.

The main bearings.

What is the function of the value PR close to the lubrication oil pump?

To keep the oil temperature constant.

To absorb pump vibrations.

To keep the oil pressure constant.

To act as a high pressure safety valve.

What type of pump is the pump “P\"?

A vane pump.

A gear or worm wheel pump.

A piston pump.

A centrifugal pump.

What type of scavenge air system is applied to this diesel engine?

Compounded scavenging.

None of the above.

Uniflow scavenging.

Loop scavenging.

When does the exhaust valve \"EV\" open?

None of the above.

When the piston moves upward.

At the end of the working stroke.

When the piston is at bottom dead point.

Which type of exhaust manifold feeds this turbocharger?

Split type.

Booster type.

Impulse type.

Constant pressure type.

What is the function of drain valve “D\"?

To drain hydrocarbons and avoid explosion.

To drain the oil from the manifold.

To release the air when the engine is stopped.

To drain the moisture from the manifold.

Which thermometer always indicates the highest temperature in the turbocharger?

TE6.

TE.

TE1.

TEB.

What do you think would be a reasonable scavenge air pressure for this engine running at full speed?

7,0 kg/cm².

25 kg/cm².

1,25 kg/cm².

What might be a reasonable value for the scavenge air temperature of this diesel running at full speed?

45 degrees °C.

420 degrees °C.

75 degrees °C.

28 degrees °C.

Under normal running conditions, what pressure is the air entering the exhaust gas turbocharger “EGT\" ?

Under high pressure.

Under a vacuum.

Under atmospheric pressure.

Under slight over pressure.

In what part shown on this scavenge air schematic diagram is heat converted into mechanical power?

In the main engine.

In part 2, the turboblower.

In part 1, the exhaust gas turbine.

In part 5, the scavenge air blower.

The scavenge air compressed in the turbo blower is cooled down in the scavenge air cooler (item 3) under……

constant pressure (Isobaric condition).

constant volume (Isochoric condition).

isothermic condition.

adiabatic condition.

In which part indicated on this scavenge air schematic is mechanical power converted to thermal power?

In the exhaust gas boiler.

In the main engine.

In the exhaust gas turbine (no 1).

In the turboblower and scavenge air blower (no 2 and no 5).

In an “impulse type\" exhaust gas turbocharger, the exhaust gases of the main engine ………?

are led to two or three sections of the exhaust gas manifold.

are entering into a spacious exhaust gas manifold.

are driving only one single turbocharger.

are led in pipe groups directly and separately to the turbocharger.

On which unit of the scavenge air system is an automatic drain fitted?

On the turbo blower.

On the exhaust gas boiler.

On the scavenge air manifold.

On the scavenge air blower.

Why can the temperature of the scavenge air after the scavenge air cooler not be lowered below a given temperature and why has the temperature to be regulated above this value ?

To avoid condensate and water entering the engine.

To avoid misfiring and starting problems.

To avoid cracking of the cylinder line.

To maintain the thermal efficiency of the diesel.

In a constant pressure type turbocharger the exhaust gas enters the turbo charger via …………..?

a separate manifold for each turbocharger.

the grids of the common exhaust gas manifold.

the grids of two or more exhaust piping groups.

nozzles on each individual exhaust pipe.

For a turbo charger is running at full speed, what would be a usual oil sump temperature on the turbine side ?

45 to 50 degrees °C.

72 to 82 degrees °C.

35 to 45 degrees °C.

55 to 65 degrees °C.

When you read a crankshaft deflection figure and the + sign is indicated, for example +4, this means that……

the main bearing on one side is 4/100 mm greater than the other.

the crankpin location is 4/100 mm out of centre.

the crankwebs have opened up by 4/100 mm.

the crankwebs have closed in by 4/100 mm.

What are the two most important factors influencing the crankshaft deflection readings?

Bearing wear and bedplate alignment.

Ballast tank condition and bedplate alignment.

Bedplate alignment and condition of after peak.

Condition of ballast tanks and temperature of engine.

What are the steps to be taken, in what order, to stabilise the governor of a diesel engine after overhaul?

Set integrating to MAX. than adjust speed P and differential D.

Adjust speed P, then integrate, next differentiating, from 0.

Integrating and differentiating MAX, set speed from 0 upwards.

Set integrating to MAX, differentiating to MIN, adjust speed upward.

What is the purpose of a safety valve fitted in the cylinder cover of a diesel engine?

To release gas from the cylinder by operating turning gear.

To open in port so the engine cannot be started.

To release excessive gas pressure from the cylinder.

To drain off water and condensate from the cylinder.

What force makes a safety value of a diesel engine open?

The exhaust gas pressure.

The starting air pressure admitted in the cylinder.

The fuel pressure to the cylinder head.

The pressure inside the combustion space.

At which moment exactly does the safety value of a diesel engine opens?

When the gas pressure in the engine exceeds the spring pressure.

When fuel was retained previously in the cylinder.

When too much starting air is admitted.

At top dead point of the cylinder by max firing pressure.

In which stage of its working process is this two-stroke diesel engine?

Gas expanding.

Compressing.

Scavenging.

Firing.

What type of engine is shown here?

A two stroke diesel with piston underside scavenging.

A two stroke diesel with spiral scavenging.

A two stroke diesel with uniflow scavenging.

A two stroke diesel with loop scavenging.

If you are taking crankshaft deflections, for which position will you list the reading which was last taken if the engine turns counterclockwise ? Right is PS, left is SB.

Zero.

TS.

What is the structural lay-out of this diesel engine?

Foundation, one-piece motor block.

Separate bedplate, one part crankcase and cylinder block.

One unit foundation and bedplate, separate cylinder block.

Separate bedplate, columns, cylinder block for each cylinder.

From which type of diesel engine is this running gear?

A four stroke air cooled diesel engine.

A two stroke trunk type diesel engine.

A two stroke crosshead type diesel engine.

A four stroke oil cooled piston diesel engine.

A piston of this type is composed of the following main parts:

piston body, piston flange, piston crown.

piston crown, piston rod, piston skirt, intermediate piece.

piston crown, piston body, piston rings.

piston, piston rings, telescopic piping.

What would you call the assembly fitted on the piston rod, which fits into a flange on top of the crankcase block opening through which the piston rod moues in order to secure tightness ?

The piston rod stuffing box.

The crankcase sealing assembly.

The piston underside values.

The scavenging air value box.

During normal operation, the telescopic piping of this diesel engine\'s piston are sliding up and down into ……..

compressed air vessels.

telescopic buffer vessels.

piston cooling water piping.

the crankcase cooling space.

What should you inspect and measure on the piston crown, when overhauling this main engine piston?

The scavenge and exhaust ports, the piston/ring grooves.

Cylinder liner wear, ring groove clearance, piston rod ovality.

The rubbing bands, the oil and the carbon, stuffing box.

Ovality, burning marks and pitting, piston ring/groove clearance.

What is the purpose of the starting value fitted on the cylinder head of a diesel engine?

To allow air from the main air bottle to enter the cylinder directly.

To block the fuel and air supply unless in “START\" position.

To allow starting air of 25 kg/cm² into the cylinder if applicable.

To activate the main air starting value fitted on the engine.

At what moment will the cylinder head starting air valve, shown here, open and allow 25 kg/cm² to flow into the cylinder ?

When the control air on top is vented by the starting cam.

When control air is supplied to the top connection.

When the main starting air is opened from the bottle.

When 25 kg/cm² air is supplied on top by manoeuvring.

How is the air-tightness of the sliding piston (moved by control air pressure and spring) ensured in starting air values of this type ?

Labyrinth seals are fitted.

O-ring seals are fitted.

Piston rings are fitted.

Teflon seats are fitted.

What kind of periodic activity needs to be carried out on the main engine prior to manoeuvering with regard to the starting air system?

See that the cy starting valve is moving by air hose connection.

Check if the valves are moving freely with a torque spann.

Open up the main and cylinder head starting valve and clean pistons.

Grease the valves by grease cup or grease gun, drain moisture.

How are starting air values made gas tight in the cylinder heads of diesel engines?

They are screwed into the cylinder head and asbestos sealed.

A copper gasket is fitted.

By face to face, hydraulic pressure applied.

Teflon or Viton seal rings are fitted.

What kind of scavenging is shown on the top left drawing?

Cross scavenging.

Transversal scavenging.

Loop scavenging.

Single valve uniflow.

What kind of diesel scavenging system is shown on the top centre drawing?

Cross scavenging.

Four-way uniflow.

Transversal.

Loop scavenging.

What kind of diesel scavenging system is shown on the top right drawing?

Loop scavenging.

Cross scavenging.

Traverse scavenging.

Uniflow scavenging.

What kind of scavenging system is shown on the bottom left drawing?

Loop scavenging.

Cross scavenging.

Transverse scavenging.

Uniflow scavenging.

What kind of scavenge air system is shown on the right bottom drawing?

Uniflow scavenging.

Loop scavenging.

Balanced scavenging.

Cross scavenging.

Loop scavenging, cross scavenging and traverse scavenging are called ………… scavenging, as opposed to UNIFLOW scavenging.

INVERSE FLOW.

MULTIFLOW.

DIVERSE FLOW.

REVERSE FLOW.

How is it ensured that the flow of the scavenge air is directed symmetrically through the cylinder?

By the uniflow system.

By the reverse system.

By the scavenge port shape.

By the turbocharger.

What common name is given for this type of fuel pump?

Bosh type fuel pump.

Rotating plunger type fuel pump.

Plunger type fuel pump.

M.A.N. type fuel pump.

What determines the amount of fuel pumped per stroke with this fuel pump?

The setting of suction and overflow valve.

The lifting height of the plunger.

The setting of the overflow valve.

The rotating angle of the plunger in the barrel.

How is the timing adjusted on this type fuel pump?

By the fuel cam setting.

By the plunger rotation.

By the suction valve setting.

By the delivery valve setting.

The fuel delivery pipe between fuel pump and injector, is shown here as a red interrupted line. For \"UMS \" classed vessel, how is this pipe best described ?

It is manufactured of high tensile steel and has to have thermal insulation fitted.

It needs to be a shielded pipe so that in case of rupture the fuel leakage can be contained and the alarm sounded.

It is manufactured from Austenit Steel and has flame/smoke detectors fitted in the vicinity.

It must be provided with sensors so that the corresponding fuel pump cuts out in case of rupture.

What is the mechanism that moves the injection needle upwards in the injector and causes the injector to spray fuel under pressure into the cylinder?

The balance pressure obtained by the injector spring.

The mechanical force of the fuel cam.

The hydraulic pressure in the fuel line.

The lifting pressure of the pump plunger.

If you want to obtain a higher lift-off pressure in the injector, you can……

tension the fuel pump spring more.

adjust the fuel pump cam to advance.

adjust the fuel oil cam to retard.

tension the injector spring more.

The engine to which this fuel pump is fitted is ……..

a main engine with controllable-pitch propeller.

an auxiliary engine fuelled by heavy fuel oil and driving an alternator.

main engine with direct coupled shaft and propeller.

an auxiliary engine fuelled by diesel oil driving an alternator.

The upward movement caused by the fuel cam is transferred to the plunger via the ………… on the pump.

barrel.

plunger spring.

roller.

cam lever.

The injector seen in the drawing is best described as …. type injector.

forced circulation.

a heavy fuel oil.

a diesel oil.

a water cooled.

The end of the pumping action of this fuel pump is determined by the position of the………

fuel cam.

suction valve.

overflow valve.

pipe plunger.

As an engine runs the position of the crankshaft changes constantly with respect to the engine bed plate. Distortions need to be measured and are called ……..

crankshaft distortion readings.

crankshaft misalignment calibrations.

crankshaft deflection measurements.

Any of these answers.

What is the distance between the piston and the cylinder head known as when the piston is at bottom dead center?

Any of these.

The stroke.

The compression clearance.

The combustion clearance.

In an engine operation, what is the effect called that describes the unstable operation of the governor that will not maintain a steady state condition?

Stability.

Sensitivity.

Deadbeat.

Hunting.

In a diesel engine using a constant stroke fuel pump, to increase the firing pressure or maximum pressure in the cylinder the fuel pump plunger is adjusted by..

changing plungers.

lowering the plunger.

lifting the plunger.

cleaning and lubricating the plunger.

When a new cylinder liner is fitted to a 2-stroke engine, which of the following steps should be taken ? I. Increase the cylinder oil flow. II. Reduce the cylinder load. III. Reduce the oil flow.

I, II and III.

I and II.

II and III.

I and III.

When checking the tightness of nuts and bolts during at the quickest and most effective method is……

checking the tightness using torque spanners.

checking the stress on the locking plates or split pins.

checking bold clearances with feeler gauges.

tapping the nuts and bolts with a hammer.

If you get a heavy scavenging air fire, which of these parts is likely to take the most serious damage?

The exhaust valve.

The piston.

The crosshead bearing.

The stuffing box.

In diesel engines, cylinder lubrication has the primary function of …

cooling the piston which would otherwise overheat and ensure that the carbon between the piston rings is cleared away.

ensuring that cylinder liner and piston are well oiled so that they will not overheat.

flushing the carbon residue from the piston skirt and wash it down into the scavenge space.

forming a film between liner and rings acting as a sealing barrier to prevent the escape of combustion gases, at same time reduce friction of parts.

Broken piston rings on diesel engines, if not visibly broken, can be identified because …….

the piston skirts show marks of burned oil.

the ring or groove clearances have worn in excess.

the piston crowns have developed hot spots and burning arks over the surface.

they are darker in colour and lack elasticity when pushed towards the inside of their grooves.

Fire in the scavenging chambers of diesel engines may be caused by combustion of carbon deposits accumulated over an extended period due to……..

locked stuffing box drain piping or worn stuffing box ear rings or sealing rings.

slow combustion caused by poor injection.

excessive lubrication of the cylinder liner.

wrong grade fuel oils used for extended period in the engine.

Diesel Engine crankcase oil mist detectors are designed to analyse….

the temperature of the bearings in the crankcase.

the temperature of the oil in the crankcase.

the concentration of oil vapours in the crankcase.

fire risk in the crankcase.

The direction of flow of cooling water in an engine is always…….

from left to right.

from bottom to top.

from right to left.

from top to bottom.

Which part of a diesel engine keeps the engine speed constant regardless of the engine load?

The manoeuvring controller.

The vibration damper.

The flywheel.

The governor.

Automatic shutdown of the main diesel engine always acts on the…

manoeuvring disc.

fuel supply.

control air supply.

governor.

Putting additives into diesel engines cooling water is primary designed to prevent….

freezing.

leakages.

scaling.

overheating.

In the Main Engine sea water circuit why are the Lub Oil and the Scavenge air coolers fitted in front of the jacket and piston water coolers?

The Scavenge air and Lub Oil coolers have by-pass valves fitted.

For no particular reason.

They need more cooling water.

The Lub Oil and Scavenge air temperatures are lower.

Pressure in the combustion chamber can be reduced by:

a burnt piston top.

a leaking exhaust valve.

All of these.

a piston ring failure.

Temperature in the combustion chamber will be reduced by:

not using the auxiliary fan.

a defective fuel valve.

lubrication low pressure.

a low air pressure.

Which part is the fresh water cooler?

Number 6.

Number 7.

Number 1.

Number 4.

What is part number 5?

A double valve.

A controllable thermostat.

A thermostat.

A Three-Way Valve.

What part is the de-airating tank?

Number 4.

Number 7.

Number 1.

Number 6.

Pipe number 8 is connected to the salt water cooling system. Why?

To back flush the cooling water system.

For use in an emergency only.

Any of the above.

To operate the cooling system with salt water during cleaning of the fresh water generator.

What is the purpose of part number 6?

To prevent accumulation of air in the cooling system.

To prevent an increase in water pressure.

To measure difference of pressure before and after the cooler.

To be an extra expansion tank.

What is the purpose of the expansion tank?

To act as a spare tank in case the pressure is dropping.

To take up the difference of water volume with changes of temperature.

To store extra water.

To take up the difference of water pressure with changes of temperature.

Which of the following is a record of the pressure existing in the cylinder at vacuum positions of the piston throughout the engine cycle?

An Indicator diagram.

A Cycle diagram.

A Timing diagram.

A Temperature diagram.

To find the indicated power developed in the cylinder the indicator card is used to determine the…….

mean effective pressure.

compression pressure.

mean height of the diagram.

bring pressure.

How is the exhaust gas turbocharger cooled in relation to the engine?

In tandem with the cylinders.

In series with the cylinders.

In parallel with the cylinders.

In line with the cylinders.

The revolutions on the turbocharger have increased during the night with unmanned engine. This is be cause by ………

the wind and current holding the vessel back.

the wind and current being favourable.

poor combustion due to malfunction of fuel valves.

the viscosity of the fuel being high.

Which of the following is the distance between the piston and the cylinder head when the piston is at bottom dead center?

Compression clearance.

Combustion clearance.

Cylinder clearance.

Any of these.

An engine\'s fuel pump supplies fuel in excess of the fuel consumed and this excess fuel is returned to the pump suction via the ….

non-return valve.

fuel rack.

pressure regulating valve.

plunger.

Failed O-rings on a 2 stage air compressor cylinder liner have resulted in a water leak. Where is the leaking water most likely to go when the compressor is operating?

Into the crankcase and mix with the lube oil.

Into the LP cylinder.

Into the HP cylinder.

Into the intercooler.

For which duties are gear and screw pumps normally employed?

Fuel and lubricating oil services.

Jacket cooling water circulation for diesel engines.

Bilge pumping.

Main sea water circulation systems.

From the options given, select the conditions that you would expect to give best separation results from a centrifuge operating as a purifier.

High temperature and low flow rate.

High flow rate and low temperature.

High flow rate and high temperature.

Low flow rate and low temperature.

How is the condenser cooling water flow regulating valve automatically controlled in a vapour compression refrigeration system?

By the compressor discharge pressure.

By the temperature in the refrigerated room.

By the quantity of refrigerant in the system.

By the temperature of the refrigerant after the evaporator.

How is the condenser in a fresh water evaporator normally cooled?

With seawater.

With distillate.

With air.

With brine.

How often should an oxygen analyzer instrument for the inert gas system be calibrated?

Prior to every plant start-up following a shut down of 8 hours or more.

Every time the plant is shut-down.

At regular intervals.

On Chief Officers order.

In a low pressure auxiliary boiler, what would be considered to be the maximum allowable chloride level of the boiler water?

300 PPM.

600 PPM.

1 000 PPM.

50 PPM.

In a low pressure, auxiliary boiler, water tests show that the p-alkalinity is 50ppm CaCO₃. What action should be taken?

Increase the dosage of boiler water treatment.

Blow down the boiler and reduce dosage of boiler water treatment.

No action is necessary because this is a normal reading.

Reduce dosage of boiler water treatment.

In a purifier assuming the separating temperature is correct, what is the probable cause of the processed oil containing water?

The gravity disc is too small and/or the flow rate is too high.

The gravity disc is too large.

The throughput is too low.

The back pressure at the clean oil outlet is too high.

The amp-load for an electric motor driving a centrifugal pump has gradually reduced over a period of service. The pump is still supplying water but at a reduced pressure and flow. Which of the alternatives given is the probable reason for this?

The pump impeller and wear rings have worn.

The pump is running at a lower speed due to a short circuit in the electric motor.

The pump has suction from a number of sources at the same time.

The suction strainer element has been removed so the pump is more efficient.

What action should be taken if a purifier starts to vibrate heavily during normal operations?

Stop the purifier immediately. Check the machine for fouling or mechanical damage. Donot restart until cause is identified and fault rectified.

Stop the purifier and then restart it.

Change the flow rate.

Leave the purifier running and check it again after its next scheduled sludge cycle.

What action should be taken if the heat transfer capacity of a heat exchanger operating as a lubricating oil cooler is reducing?

Increase the cooling water pressure.

Decrease the lubricating oil flowrate.

Increase the lubricating oil flowrate.

The heat transfer surfaces should be cleaned.

What cooling medium is normally used to cool the condenser of a fresh water generator?

Seawater.

Distillate (Freshwater).

Air.

Brine.

What effect does an increased oil feed flow rate have on the performance of a centrifuge operating as a purifier?

Separating efficiency is increased, more water is removed.

Separating efficiency is reduced.

Separating efficiency is unchanged.

Separating efficiency is increased, more solids are removed.

What is the correct method to be used to obtain a reduced output from a centrifugal pump?

By throttling of the pump suction valve.

By adjusting the pump relief valve.

By throttling of the pump discharge valve.

By opening the pump recirculation line.

What is the expected state of the refrigerant immediately before the expansion valve in a vapour - compression refrigeration system?

Liquid at high pressure.

Vapour at high pressure.

Liquid at low pressure.

Vapour at low pressure.

What is the main advantage of having a central cooling system fitted on board ship?

It is a simple system with minimum control requirements.

Only one heat exchanger is needed for all cooling duties.

It does not require any seawater.

It should require less maintenance than a conventional water.

What is the most likely cause of an increase in the chloride content of the fresh water in a central cooling system?

Insufficient cooling water treatment.

Leakage of sea water from the central coolers.

Exhaust gas leakage into the freshwater at the turbochargers.

Leakage from an oil cooler into the fresh water system.

What is the most likely cause of the clean oil outlet pressure being higher than normal when operating a centrifuge as a fuel oil separator?

Valve in the outlet line incorrectly positioned.

High fuel oil temperature.

Broken water seal.

Drive clutch slipping.

What is the most likely reason for vibration and noise at the suction side of a centrifugal pump when it is running?

Water hammer in the pump casing.

Fluid friction in the suction line.

Pump suction valve fully open.

Collapsing vapour bubbles due to cavitation.

What is the purpose of an expansion valve in a refrigeration system circuit?

To control the suction pressure at the compressor.

To control the cargo hold temperature.

To control the flow rate of liquid refrigerant to the evaporator.

To control the cooling water temperature through the condenser.

What pressure is present in the crankcase of a vapour compression refrigeration compressor?

The same as the discharge pressure.

The same as the suction pressure.

The same as the atmospheric pressure.

The same as the lubricating oil pressure.

What refrigerant temperature would you expect to find at the compressor discharge of an air conditioning system?

+ 5 °C.

-10 °C.

+ 85 °C.

+ 40 °C.

What will happen with the oil water interface in the purifier bowl if the dirty oil throughput rate is too great?

The interface will move outwards allowing oil to discharge from the water outlet.

The bowl will be forced open and the interface will be lost.

The interface will move inwards allowing water to discharge through the oil outlet.

The throughput rate has no effect on the interface.

What would be a typical oil feed temperature for purifying heavy fuel oil in a centrifuge in order to ensure good separation?

105° - 108° Celsius.

75° - 78° Celsius.

85° - 88° Celsius.

95° - 98° Celsius.

What would be a typical separating temperature range for purifying mineral oil based lubricating oil in a centrifuge?

65 -85 °C.

45 - 65 °C.

85 - 105 °C.

< 45 °C.

What would be a typical setting for the low lubricating pressure trip for a refrigeration compressor?

+ 1,0 bar.

- 0,5 bar.

+ 5,0 bar.

+ 10 bar.

What would be considered as an acceptable range for the p-alkalinity in a low pressure auxiliary boiler?

100 - 300 ppm CaCO₃.

0 - 100 ppm CaCO₃.

300 - 600 ppm CaCO₃.

600 - 1000 ppm CaCO₃.

What would be the consequence of operating a centrifugal pump with the discharge valve closed for an extended period of time?

The pump relief valve will open and discharge to the bilge.

The pump will eventually overheat.

The electric motor will eventually overheat.

The electrical motor overload will eventually trip.

What would be the main effect on a refrigeration system of insufficient cooling water flow through the condenser?

Reduced delivery pressure.

Increased icing up of the compressor suction line.

Reduced suction pressure.

Increased delivery pressure.

When operating two centrifuges in series, in a purifier and clarifier arrangement, what is the purpose of the clarifier?

To improve the efficiency of solids removal.

To stabilise the feed temperature.

To increase the overall throughput rate.

To improve the efficiency of water removal.

Which of the following conditions could be the cause of an air conditioning system evaporator icing up?

Too high discharge pressure.

Too low suction pressure.

Low sea water temperature.

High sea water temperature.

Which of the following statements is correct in relation to two stage air compressors?

The largest diameter piston is the second stage piston.

A greater mass of air is delivered by the first stage than the second stage.

The pistons for both stages are the same diameter so that air delivery from each stage is equal.

The smallest diameter piston is the second stage piston.

Which parameters are required in order to evaluate the condition of a heat exchanger during operation?

Inlet and outlet temperatures and pressure drops for both fluids.

Inlet and outlet temperatures for either fluid.

Pressure drop for cooling water.

Outlet temperatures for both fluids.

Why are Chromate Based Cooling Water Treatments not allowed when the cooling system is connected to a fresh water generator?

Chromates react with the materials used in fresh water generators.

Chromates increases the chloride level in the fresh water generator.

Chromates are poisonous.

Chromate based cooling water treatments are not allowed to be used in any cooling water system.

Why are crankcase heaters fitted to some refrigeration system compressors?

To control the viscosity of the lubricating oil.

To prevent refrigerant condensing in the crankcase when the compressor is stopped.

To boil off any water from condensation in the crankcase.

To prevent ice from forming on the compressor casing.

Why are hypochlorite based treatments used on some sea water cooling systems?

To prevent biological growth in the system.

To prevent corrosion of the system.

To increase the heat transfer capacity of the system.

To reduce sediment build up in the system.

Why is it preferable to have the sea water pressure lower than the fresh water pressure in a sea water cooled heat exchanger for a central cooling system?

To reduce any scale deposits on seawater side.

To reduce erosion of the seawater side of the heat exchanger.

To minimise the load on the seawater pump motor.

Prevent seawater contamination of the central cooling system in the event of seal failure.

With reference to using centrifuges for cleaning fuel and lubricating oil what is the difference between a purifier and a clarifier.

There is no difference, both use centrifugal force.

In a clarifier only solids are removed from the oil, whereas in a purifier both solids and water are removed from the oil.

Purifiers are used when only solids are present in the oil.

Clarifiers are used when water is present in the oil.

What is the correct method to be used to obtain a reduced output from a centrifugal pump?

By throttling of the pump suction valve.

By adjusting the pump relief valve.

By throttling of the pump discharge valve.

By opening the pump recirculation line.

What is the expected state of the refrigerant immediately before the expansion valve in a vapour - compression refrigeration system?

Liquid at high pressure.

Vapour at high pressure.

Liquid at low pressure.

Vapour at low pressure.

What is the main advantage of having a central cooling system fitted on board ship?

It is a simple system with minimum control requirements.

It should require less maintenance than a conventional water.

Only one heat exchanger is needed for all cooling duties.

It does not require any seawater.

What is the most likely cause of an increase in the chloride content of the fresh water in a central cooling system?

Insufficient cooling water treatment.

Exhaust gas leakage into the freshwater at the turbochargers.

Leakage from an oil cooler into the fresh water system.

Leakage of sea water from the central coolers.

What is the most likely cause of the clean oil outlet pressure being higher than normal when operating a centrifuge as a fuel oil separator?

Valve in the outlet line incorrectly positioned.

High fuel oil temperature.

Broken water seal.

Drive clutch slipping.

What is the most likely reason for vibration and noise at the suction side of a centrifugal pump when it is running?

Water hammer in the pump casing.

Fluid friction in the suction line.

Pump suction valve fully open.

Collapsing vapour bubbles due to cavitation.

What is the purpose of an expansion valve in a refrigeration system circuit?

To control the suction pressure at the compressor.

To control the flow rate of liquid refrigerant to the evaporator.

To control the cargo hold temperature.

To control the cooling water temperature through the condenser.

What pressure is present in the crankcase of a vapour compression refrigerationcompressor?

The same as the suction pressure.

The same as the discharge pressure.

The same as the atmospheric pressure.

The same as the lubricating oil pressure.

What refrigerant temperature would you expect to find at the compressor discharge of an air conditioning system?

+ 5 °C.

-10 °C.

+ 85 °C.

+ 40 °C.

What will happen with the oil water interface in the purifier bowl if the dirty oil throughput rate is too great?

The bowl will be forced open and the interface will be lost.

The interface will move inwards allowing water to discharge through the oil outlet.

The interface will move outwards allowing oil to discharge from the water outlet.

The throughput rate has no effect on the interface.

What would be a typical oil feed temperature for purifying heavy fuel oil in a centrifuge in order to ensure good separation?

95° - 98° Celsius.

85° - 88° Celsius.

75° - 78° Celsius.

105° - 108° Celsius.

What would be a typical separating temperature range for purifying mineral oil based lubricating oil in a centrifuge?

< 45 °C.

85 - 105 °C.

45 - 65 °C.

65 -85 °C.

What would be a typical setting for the low lubricating pressure trip for a refrigeration compressor?

- 0,5 bar.

+ 1,0 bar.

+ 5,0 bar.

+ 10 bar.

What would be considered as an acceptable range for the p-alkalinity in a low pressure auxiliary boiler?

600 - 1000 ppm CaCO₃.

300 - 600 ppm CaCO₃.

0 - 100 ppm CaCO₃.

100 - 300 ppm CaCO₃.

What would be the consequence of operating a centrifugal pump with the discharge valve closed for an extended period of time?

The pump relief valve will open and discharge to the bilge.

The pump will eventually overheat.

The electric motor will eventually overheat.

The electrical motor overload will eventually trip.

What would be the main effect on a refrigeration system of insufficient cooling water flow through the condenser?

Increased delivery pressure.

Reduced delivery pressure.

Increased icing up of the compressor suction line.

Reduced suction pressure.

When operating two centrifuges in series, in a purifier and clarifier arrangement, what is the purpose of the clarifier?

To stabilise the feed temperature.

To increase the overall throughput rate.

To improve the efficiency of solids removal.

To improve the efficiency of water removal.

Which of the following conditions could be the cause of an air conditioning system evaporator icing up?

Too low suction pressure.

Too high discharge pressure.

Low sea water temperature.

High sea water temperature.

Which of the following statements is correct in relation to two stage air compressors?

The largest diameter piston is the second stage piston.

The smallest diameter piston is the second stage piston.

A greater mass of air is delivered by the first stage than the second stage.

The pistons for both stages are the same diameter so that air delivery from each stage is equal.

Which parameters are required in order to evaluate the condition of a heat exchanger during operation?

Inlet and outlet temperatures for either fluid.

Pressure drop for cooling water.

Outlet temperatures for both fluids.

Inlet and outlet temperatures and pressure drops for both fluids.

Why are Chromate Based Cooling Water Treatments not allowed when the cooling system is connected to a fresh water generator?

Chromates react with the materials used in fresh water generators.

Chromates increases the chloride level in the fresh water generator.

Chromates are poisonous.

Chromate based cooling water treatments are not allowed to be used in any cooling water system.

Why are crankcase heaters fitted to some refrigeration system compressors?

To prevent refrigerant condensing in the crankcase when the compressor is stopped.

To control the viscosity of the lubricating oil.

To boil off any water from condensation in the crankcase.

To prevent ice from forming on the compressor casing.

Why are hypochlorite based treatments used on some sea water cooling systems?

To prevent corrosion of the system.

To increase the heat transfer capacity of the system.

To reduce sediment build up in the system.

To prevent biological growth in the system.

Why is it preferable to have the sea water pressure lower than the fresh water pressure in a sea water cooled heat exchanger for a central cooling system?

To reduce any scale deposits on seawater side.

Prevent seawater contaminaton of the central cooling system in the event of seal failure.

To reduce erosion of the seawater side of the heat exchanger.

To minimise the load on the seawater pump motor.

With reference to using centrifuges for cleaning fuel and lubricating oil what is the difference between a purifier and a clarifier.

In a clarifier only solids are removed from the oil, whereas in a purifier both solids and water are removed from the oil.

There is no difference, both use centrifugal force.

Purifiers are used when only solids are present in the oil.

Clarifiers are used when water is present in the oil.

When an automatic power supply system is provided with an auxiliary diesel stand-by system, and the power supply trips at time ZERO, which of the following is a feasible sequence of activities ?

Time zero + 30 sec: the stand-by diesel starts. + 45 sec: the stand-by diesel runs. + 60 sec: the power is restored.

Time zero + 5 sec: the stand-by diesel starts. + 10 sec: the stand-by diesel runs. + 25 sec: the power is restored.

Time zero: the stand-by diesel starts. + 7 sec: the stand-by diesel runs, + 8 sec: the power is restored.

Time zero + 10 sec: the stand-by diesel starts. + 20 sec: the stand- by diesel runs. + 40 sec: the power is restored.

The best way of testing the \"stand-by\" function of the emergency diesel alternator is by…..

starting the emergency diesel manually from the spot and check for any leakages or deficiencies.

causing a total black-out on the ship, example in drydock or when time is available in port.

by switching off the emergency switch board supply breaker on the main switch board.

switching on the lest run\' button on the emergency diesel switchboard.

In which part of a large alternator is the electric power produced?

In the rotor.

In the sliprings.

In the excitatory.

In the stator.

How is the voltage output of an alternator controlled?

By the excitation current in the rotor.

By the resistance bridge in the main switchboard.

By the excitation current in the stator.

By the alternator speed.

The reason why two-stage starting air compressors are used in preference to single stage compression is that ........

the starting air current of a single stage compressor would be too high.

the temperature developed by single stage compression would be too high.

the power absorption by single stage compression would be too high.

the friction in a single stage compressor would be too high.

In what kind of machinery do you find this type of valve fitted?

Main engine scavenge air manifold.
Auxiliary diesel crankcase doors.
Air compressors cylinder heads.
Ventilation air ducts.

Which kind of cooling water system is used with this compressor?

Free flow fresh water cooling.
Forced sea water cooling.
Open free flow sea water cooling.
Forced fresh water cooling.

What is the indication of the inlet of the cooling water in position \"I\" of both cylinders ?

Water inlet of cylinders.
Water inlet of cylinders/intercoolers.
Water inlet of aftercoolers.
Water inlet of Intercoolers.

Suppose the delivery air pressure of this compressor is 30,0 kg/cm². What class of compressor could this be?

An instrument air compressor.
A service air compressor.
A starting air compressor.
A working air compressor.

What are the units marked \"C\" fitted on both cylinders?

Aftercoolers.

Cooling water vessels.

Intercoolers.

Cylinder blocks.

When is manual by-pass valve of this compressor cooler \'\'CW\" operated?

During normal running to keep the temperature constant.

In cold climates to avoid moisture.

When the compressor is new/overhauled with new rings.

When the compressor is started to allow for temperature rise.

This drawing indicates the timing of the unloader and drains of a compressor. After how many seconds will the compressor pump at full capacity?

Somewhere between 7 and 14 seconds.
12 seconds.
14 seconds.
7 seconds.

When starting a compressor, why is it necessary for the unloader to be activated before the drain valves closed?

To prevent the compressor from tripping.
So the pumping action can blow the drains through.
To avoid the safety valves blowing.
To avoid air blowing in the bilges.

Why is it necessary to start a compressor with the drains open?

To get rid of all the dirt inside.
To avoid overloading.
To hear that it is delivering pressure.
To blow clear the inevitable moisture of.

On what part of the compressor does the unloader act and in what way?

It keeps the suctions valves closed.
It keeps the delivery valvesclosed.
It keeps the suction valves open.
It keeps the delivery valves open.

What is the function of item \"PC\" ?

Pressure Container admitting air to air bottle.
Piston Controller activating compressor piston movement.
Pressure Controller activating 3-way valve solenoid.
Pressure Container activating automatic pressure release valve.

What is item \"U\" how does it act on item \"S\"?

Item \"U\" is the unloader lifting the compressor suction valve.
Item \"U\" is the upper pressure limit valve activating the solenoid.
Item \"U\" is the activator for the safety release valve.
Item \"U\" is the uplifter of the air bottle\'s safety valve.

What would be the pressure in the air bottle which activates the \"PC\" and \"S\" connecting the unloader line with c and a?

Between 6,5 and 8,5 kg/cm2.
Between 8,5 and 9,35 kg/cm2.
Between 0 and 8,5 kg/cm2.
Between 8,5 and 10,0 kg/cm2.

What is the purpose of the stuffing box in this combined piston compressor assembly?

All of these.
To prevent oil from being pumped up to the pumping piston.
As sealing between pumping cylinder and guide cylinder.
To keep the air of the pumping space separated from the guide.

In this oil-free compressor, of what material are the piston rings of the pumping piston \"P\" made?

Ribbed alloy.
Chromium.
Slotted chromium.
Carbon.

Which main compressor is normally used to top up the main air bottles?

Main air compressor N° 1.

Main air compressor N° 1 or N° 2.

Main air compressor N° 2.

During vessel maneuvering, which Main Air Bottles are used?

N° 1 and N° 2 Main Air Bottle.

N° 1 or N° 2 Main Air Bottle.

N° 1 Main Air Bottle.

N° 2 Main Air Bottle.

What are items \"NR\"fitted after the compressors.

Demisters.

Oil separators.

Check valves.

Safety valves.

What kind of filling valves are fitted on all the air bottles?

High pressure butterfly valves.

High pressure remote-control valves.

High pressure gate valves.

High pressure SD check valves.

What is item \"M\" fitted in the discharge line of the Instrument Air Compressor (IAC)?

A moisture separator.

A drain valve.

An oil separator.

An automatic drain valve.

What is the primary purpose of drain valves \"D\" fitted on all air bottles?

To remove excessive oil from the bottle.

To remove water and condensate from the bottle.

To remove dirt from the bottle.

To blow the bottles empty if required.

Which of the appendages listed below is NOT usually fitted on a compressed air bottle?

A manometer.

A drain valve.

A thermometer.

A safety valve.

What is item \"AD\" in the main air supply line from the Instrument Air Bottle?

An air drain.

An air dryer.

An air safety discharge valve.

An air pressure safety device.

What are items \"CP\" fitted in the Working Air and Instrument Air supply lines?

Pressure capacity vessels.

Pressure relief units.

Condensate pots.

Constant pressure vessels.

Suppose you find that the safety valve of the Working Air Bottle blows off at a pressure in excess of 8,5 g/cm². Which of the causes listed below is not a possible cause for this lifting of the safety valve ?

Insufficient air consumption by the working air consumers.

Compressor unloader is stuck in loading position.

Pressure reducing valve from main air bottle defective or stuck.

Setting of cut-in/cut-out pressostat wrongly adjusted or defective.

What is part N° 3 of this valve?

A valve flexible disc.
A feather spring plate.
A disc connecting plate.
A suction/discharge plate disc.

How do you to make valve air tight during overhaul?

By lapping and polishing valve disc 4 and seat plate 5.
By fitting O-rings on seat plate 5.
By fitting cupper gaskets to the valve body.
By machining the seat of valve disc 4 and seat plate 5.

What will happen if the seat plate 5 is grinned too much so that the distance of the value disc 4 in open position increases ? Same applies for the suction as well as for the delivery valve.

The maximum output pressure decreases.
All of these.
The thermodynamic efficiency decreases.
The compression ratio decreases.

How is the value shown here made air tight in the cylinder head of the compressor?

An 0-ring of perbunan is fitted between valve and seat.
Face to face polished in the cylinder head seat.
A flat Teflon or Viton gasket is fitted.
A copper gasket is fitted.

In which kind of compressor is this type of piston assemble fitted.

A service air compressor.
CO₂ compressor.
Refrigeration compressor.
Oil-free instrument air compressor.

How is this type valve kept in place in the cylinder head of an air compressor?

It is pressed down on seating by a pressure bolt in the cylinder head.
It is fitted in a valve housing which is bolted by a flange onto the cylinder head.
It is screwed into the value space of the cylinder head.
It is kept in place by a collar flange, bolted on the cylinder head.

Why is a heavy flywheel (item number 7) required on this starting air compressor?

To accelerate evenly when starting.
To absorb the large torsional forces (2 cylinder).
To avoid stalling when drain and unloaders close.
To absorb the vibrations due to high speed (900 - 720 RPM).

How are the cylinder liners and piston rings of main air compressors usually lubricated?

By an oil wick.
By a small lubricator drop by drop via the suction valve.
By splash lubrication.
Ho lubrication is required.

In which machinery can you not add oil when running?

Air compressors or refrigerant compressors.

Hydraulic power packs.

Main Engine or Auxiliary Diesels.

Steering machinery or stern tube header tanks.

When would the high sea suction values be used?

When the ship is deeply laden at sea.

When the ship is in shallow water.

When the ship is in ballast condition.

When the ship is in polluted waters.

Can leaking stern tube seals be replaced when the vessel is afloat and if yes, how?

Yes, ballast the ship until the stern tube is clear of the water.

Yes, but only the forward seal can be replaced.

No, they can only be replaced in dry-dock.

Yes, with divers working under water whilst the forward seal is blanked.

How is stern tube wear down measured when in dry-dock?

By blade feelers inserted in the after seal.

By a poker gauge, inserted in the plugm above the stern boss tube.

By measuring the lift on the shaft.

By blade feelers inserted in the forward bush from the engine roo.

What is the purpose of the 3-way cock sited in the lowest point of the stern tube oil circuit?

To change from main to forward stern tube sealing circuit.

To remove air from the system.

To drain or sample the oil from the stern tube bearing.

To fill oil in the system.

Why is the stern tube header tank fitted above the sea water level?

To avoid sea water entering the stern tube.

Ensure lubrication of the forward stern tube seal.

Ensure lubrication of the after stern tube seal.

To prevent bilge water entering the stern tube.

What type of strainer is used in a turbine lube oil system to remove metallic particles?

A Fuller\'s earth strainer.

A Magnetic basket strainer.

A Simplex strainer.

A Metal edge strainer.

What is the steering system oil tank within the steering pedestal?

Lubrication tank for the steering gear linkage.

Reservoir for the telemotor system.

Main hydraulic system header tank.

Header tank for the auto pilot control system.

What type of filling value is fitted on all air bottles?

High pressure SD check values.

High pressure remote-control value.

High pressure gate values.

High pressure butterfly value.

What regular maintenance is required on the burner?

Cleaning and resetting of the air register.

Cleaning of the burner tips.

Overhauling of the shut-off valves.

Renewing of the electrodes.

What is the first action when flashing up a boiler?

Start up the water feed pump.

Clean the burner nozzle.

Purge furnace with air.

Power the oil pressure.

What is the effect if the fuel oil temperature is too low?

Flame impingement and refractory damage.

Blocking of fuel filter.

Fuel delivery pump cutting out.

Flame failure.

What is the most dangerous effect of water in fuel?

Damage to furnace refractory.

Loss of boiler efficiency.

Extinguishing of burner flame.

Poor combustion.

What purpose is the settling tank?

To settle out sludge.

To settle out all impurities.

To settle out water.

To settle out suspended solids.

What is the function of a Viscotherm?

Controlling fuel pressure and temperature.

To control viscosity by altering temperature.

To regulate the fuel pressure.

To control the fuel temperature.

What is the most damaging fuel contaminant?

Plater.

Sludge.

Bacterial growth.

Suspended solids.

What are gauze element filters designed to remove?

Fine non-metallic solids.

Water and sludge.

Metallic particles.

Coarse solids.

What could be the purpose of checking the fuel pump spill position?

To check the position the fuel pump ceases delivery.

To check the tightness of the pump delivery value.

To check the amount of fuel the pump will deliver.

To check the start point of injection.

How does the fuel pump rack adjust the fuel delivery?

By altering the opening and closing of the delivery valve.

By altering the effective stroke of the plunger.

By increasing the delivery pressure.

By altering the length of time the fuel pump roller contacts the cam.

What is the required temperature in the ship\'s fish room?

From -15 to -20 deg °C.

From -5 to -10 deg °C.

From 0 to -5 deg °C.

Below -25 deg °C.

How are boiler tubes secured in the end plates?

Screwed.

Expanded.

Screwed collar on the outside of the plate.

Welded.

What is the most damaging on riveted mountings?

Rusting of the rivet heads.

Raising steam too quickly.

Chloride levels too high.

Leakage through the rivets.

What condition would necessitate blowing down the boiler?

Steam pressure too high.

Chloride readings too high.

PH reading below 7 ppm.

Water level too high.

Why are some boiler tubes not plain cylindrical?

To reduce scale formation.

To facilitate gas flow.

To glue a greater heating area.

For extra strength.

What test is used in boilers to detect leaks after structural repairs?

A hydrostatic test.

A penetrant dye crack test.

An efficiency test.

Air pressure test.

What is the term for the weakening of boiler steel, as the result of inner crystalline cracking?

Caustic embrittlement.

Exposure stress.

Corrosion.

Alkaline stress.

What daily test should be carried out on boiler water?

Sludge.

Dissolved nitrogen.

Chloride.

Dissolved oxygen.

What is the most dangerous effect of scale build up in the water space?

Flame impingement on the furnace walls.

Overheating and deformation of furnace.

Damage to feed water values.

Loss of boiler efficiency.

What is the test to determine the discharge capacity of boiler safety values?

Safety value adjustment test.

Steam stop test.

Pop test.

Accumulation test.

Why are cylindrical boiler end plates of dished shape?

Increased water capacity.

Stronger than flat plates.

Easier access to manhole doors.

Better accommodates the furnace.

What mountings must be tested daily on steaming boilers?

Water level indicators.

Main feed water check values.

Safety value easing gear.

Boiler blow down values.

What material is the boiler shell constructed from?

High tensile steel.

Good quality low carbon steel.

High grade Molybdenum steel.

High carbon steel.

What is the usual pressure adjustment method on safety values?

Machine able adjustment rings.

Removable shim packs.

Different rate springs.

Set bolt and locknut.

What is the purpose of the scum values?

Draining the boiler water to the bilge.

Removal of scum from boiler water surface.

Removal of scum from feed tank water.

Removal of scum from drains observation tank.

What best describes the \"easing gear\"?

Manual lifting arrangement of safety valves.

Feed control unit.

Remote operation of stop valves.

Reduction gearing to facilitate opening of main stop valves.

What term is used to describe access holes to the boiler drum?

Furnace inspection panels.

Manholes.

Access spaces.

Inspection holes.

What mountings must be dismantled for inspection during survey?

Feed water check valves.

Safety values.

Gauge glass & value components.

AIl boiler mountings.

What is \"simmer\" in a safety value?

A metallic hammering noise.

Initial leakage before the safety value opens.

A hissing sound indicating that a safety value is leaking.

A failure of a safety value to re-seat.

What is the purpose of air release valves fitted on the boiler shell?

To vent the boiler when shut down.

To expel air when filling the boiler.

To expel air when raising steam.

To check when steam is being produced.

How is \"water hammer\" best avoided in steam lines?

Leave main stops and line values open when shutting down the boiler.

Ensure lines are drained and open valves slowly.

Open line valves as quickly as possible.

Fully open main stops and line valves when raising steam.

What controls feed water delivery?

Steam demand.

Water level control of feed pump.

Feed water tank level.

Water level control of feed water inlet value.

What is the function of the Low Level alarm?

Sound low level alarm.

Sound alarm and shut down boiler burner.

Reduce the oil supply to the boiler burner.

Increase the feed water supply.

If the gauge glass indicates no water level what is your first action?

Check the feed tank water level.

Shut off all the burners.

Blow down the gauge glass.

Check the operation of the feed pump.

What action would you take if Chloride readings are too high?

Add more chemical to the feed water.

Drain and refill the feed water tank.

Increase frequency of testing.

Blow down the boiler regularly until readings are acceptable.

What action should you take in the case of an uptake fire?

Shut off burners, shut down fans and close off air supply.

Operate soot blowers to extinguish fire.

Shut down burners but maintain fans to clear fire.

Increase air supply to burn fire out.

What percentage CO₂ in the flue gases would indicate correct combustion?

5 %.

20 %.

7 %.

13 %.

A hydrazine test is conducted on boiler water to check for:

Excess oxygen.

Phosphates.

Nitrates.

Sulphates.

What is the most likely source of Chloride contamination?

Fuel heater.

Feed water tank.

Accommodation heating.

Trains cooler.

What is the possible consequence of too high a water level in the boiler?

Boiler shutting down.

Carry-over of the boiler water.

Feed pump cutting out.

Insufficient steam generation.

When testing for chlorides what does the test indicate?

Total dissolved solids present in the water.

Phosphate present in the water.

Alkalinity level.

Solids in the water from sea contamination.

What damage could be caused by raising steam too quickly?

Overpressure of the shell.

Excess soot deposits.

Lifting the safety values.

Damage to refractory.

What term is used for unequal distribution of burner spray in the furnace?

Combustion air imbalance.

Unequal firing.

Furnace distortion.

Flame impingement.

What would your first action be if the feed pump stopped?

Shut the main stop valves.

Check the gauge glass readings.

Change over to the auxiliary feed pump.

Shut down the boiler burners.

Is it possible to blow down a steaming boiler?

No, this should never be carried out.

Yes but steam pressure should be maintained.

Yes but never allow the level to disappear from the gauge glass.

Only in an extreme emergency.

How is temperature controlled in a steam oil heater?

Steam inlet value throttled.

Oil flow increased.

Steam supply pressure reduced.

Steam outlet value throttled.

Why is a by-pass fitted onto the cooling water of the charge air cooler?

To prevent overcooling of the charge air.

To prevent the air temperature going too high.

To allow increased Jacket water flow to the water spaces.

To maintain the jacket water temperature.

What precaution must be observed when fitting new anodes?

PTFE tape applied to the plug threads to enable easy removal.

Ensure the anode is as close as possible to the tube plate.

Ensure no damage is caused to the exterior surface of the anode.

Ensure good, clean contact is made between anode and cooler body.

How is temperature controlled in a jacket water heat exchanger?

Jacket water bypassing the heat exchanger.

Regulating the sea water inlet value.

Seawater bypassing the heat exchanger.

Regulating the sea water outlet value.

What could be the effect of excess steam or reduced oil flow in an oil heater?

Deformation.

Carbon formation.

Corrosion.

Fitting.

What is the plate material used in sea-water, plate heat exchangers?

Stainless steel.

Bronze.

Cupro Nickel.

Titanium.

Why are anodes fitted to the seawater side of heat exchangers?

To afford corrosion protection to the heat exchanger.

To prevent the formation of marine growth in the water spaces.

To afford corrosion protection for the system pipes and values.

To prevent scaling of the tubes and tube plates.

What is the main advantage of plate heat exchangers?

Require less maintenance.

Easier to clean.

More efficient and take up less space.

Cheaper to install.

How is the quality of the distilled water from a fresh water generator improved?

Decreasing the jacket water flow to the evaporator.

Decreasing the seawater feed to the evaporator.

Slowing down the output of the evaporator.

Increasing the shell vacuum.

What is the required salinity of the fresh water produced as drinking water onboard?

Below 50 ppm.

Below 7 ppm.

Below 2 ppm.

Below 20 ppm.

What liquid is present in the collecting point at the bottom of the evaporator?

Fresh water.

Brine.

Sea water.

Ejector water.

What is the maximum salinity for water produced by a freshwater generator when it is to be used as feed water for medium-pressure boilers?

20 ppm.

15 ppm.

7 ppm.

2 ppm.

How is a vacuum created in the fresh water generator?

By the condensing effect in the condenser.

By the vapour ejector driven by the ejector pump.

By pumping or ejecting out the brine.

By the differential temperature of fresh and sea water.

Why is a baffle plate fitted between evaporator and condenser?

To prevent carry over of brine.

To maintain vacuum inside the shell.

To maintain the evaporator temperature.

To cool the vapour.

What is the main advantage of vacuum production of FW?

Low cost of distillation equipment.

Utilizes waste heat from the main engine.

Less possibility of contamination.

Simpler to operate.

What precaution is necessary before starting the distillate pump?

The vacuum in the evaporator is still minimum.

The discharge valve of the pump is shut.

The pump is primed via the priming line.

Water is visible in the sight glass of the condenser.

How far from the coast is it permitted to use Low-pressure evaporation to produce drinking water?

20 miles.

30 miles.

5 miles.

12 miles.

Why is it necessary to produce fresh water from seawater?

To save cost.

To ensure purity.

To make use of waste engine heat.

Limited shipboard storage.

What factors influence the vacuum inside the shell of a fresh water generator?

The temperature of the sea water cooling the condenser.

The pressure of the ejector water on the vacuum ejector.

All of these.

The temperature of the fresh water heating the evaporator.

In a single stage air compressor what is the maximum practical delivery pressure?

15 bar.

7 bar.

3 bar.

10 bar.

What is the purpose of the automatic unloading value?

Unload the compressor at working air pressure.

Avoid high starting current on the motor.

Avoid the first stage relief values lifting when starting.

Prevent damage to the values when starting.

In the case of air-cooled compressors what form does the cooler take?

Horizontal box section pipes.

Finned circular pipes.

Honeycombed radiator.

Vertical flattened pipes.

What material are cylinder blocks and covers normally constructed from?

Fabricated steel.

Cast steel.

Cast iron.

Gunmetal.

What type of values are normally found in air compressors?

Plate or disc values.

Poppet values.

Piston controlled ports.

Slide values.

Why is the presence of oil particularly dangerous in starting air lines?

It could affect the operation of the relief valves.

The high oxygen content makes it very explosive.

It may cause sticking of the air start values.

It may carbon up and choke the lines.

What shutdown device might be fitted on air compressors?

High air pressure.

Low first stage pressure.

High delivery temperature.

Over speed.

Which is the correct sequence after starting the compressor?

Drain value closes and then unloader deactivates.

Drain closes and unloader deactivates together.

Drain value only operates on shutdown.

Unloader deactivates then drain value closes.

What service is most suitable for the use of rotary compressors?

High pressure, tow volume.

Low pressure, high volume.

High pressure, high volume.

Low pressure, low volume.

Where would you find a rotary compressor in the engine room?

Diesel engine charge air compressor.

Starting air compressor.

Control air compressor.

Emergency air compressor.

What slows the rudder movement when the requested position is reached?

The steering wheel transmitter.

The rudder control receiver unit.

The hunting gear feedback signal.

The rudder telemotor control.

In a conventional rudder system when will least power be required to move the rudder?

With vessel moving astern.

Vessel full ahead at service speed.

With the vessel stationary.

With vessel moving slowly ahead.

What happens if the rudder is moved in a heavy sea?

The tetemotor pump prevents movement by increasing the hydraulic pressure.

The main pressure relief valves lift.

The over pressure is absorbed by system accumulators.

The hydraulic motor absorbs the shock.

What is a telemotor system?

Hydraulic actuation of steering rams.

Steering gear feedback system.

Transfer of steering signals from wheel to steering gear.

Hand actuation of steering gear.

In a hydraulic telemotor system what does wheel movement provide?

Movement of the transmitter electric motor.

Movement of the transmitter pistons.

Transmits electrical signal to the hydraulic actuator valves.

Direct control of the main hydraulic pumps.

What is the purpose of Hunting Gear?

Limits the speed of the rudder movement.

To transmit hydraulic pressure.

Provides feedback to the pump control.

To control hydraulic motor swash plate movement.

In an electrically controlled hydraulic system what do the electrical controls replace?

Rudder feedback signal.

Hydraulic control values.

Hydraulic telemotor system.

The hunting gear.

What does the telemotor receiver unit control?

Hydraulic operating pressure.

Speed of rudder movement.

Hydraulic control valve.

Main steering motor control voltage.

What is meant by radial vane type steering system?

Telemotor is vane type operation.

Hydraulic actuation is onto vanes mounted onto the rudder stock.

Steering is via rotating propulsion unit.

Hydraulic pumps are vane type pumps.

When will the Hele-Shaw pump commence pumping action?

As soon as the electric motor is started.

As soon as the pilot system is started on the bridge.

As soon as a signal is received from the telemotor receiver.

As soon as the telemotor pump is started.

Upon what is the movement of the rudder dependant, when a helm order is given?

The degree of opening of the hydraulic bypass valve.

On the distance the hydraulic control lever is moved by the floating link.

On the adjustment of the feedback rod connection.

On the hydraulic pressure setting of the relief valves.

What is the function of the relief values fitted between main hydraulic cylinders?

To be opened to allow emergency steering.

To act as automatic by-pass values when the steering gear is stopped.

To act as safety values to absorb shock and avoid damage.

To return any excess oil back to the suction of the pump.

When would both steering gear motors be run together?

When at anchor in a confined anchorage.

In the tropics to overcome the lowering of the oil viscosity.

When manoeuvring in confined areas.

When on passage to minimise wear.

In a single motor electrical steering system what supplies the main steering motor?

Mains electrical supply.

Electrical supplyfrom a local motor generator.

Hydraulic power delivered bythe main steering motors.

Hydraulic power pack.

What does wheel movement control in an electric steering system?

Hydraulic transmitter.

The electrical balance of the wheel and steering motor rheostats.

Current supplied directly to the electric steering motor.

Current to the steering gear motor-generator.

Which of the following is a system for controlling the steering electrically?

Graduated stepper motors.

Ward Leonard System.

Compass repeater motors.

AC-DC rectification.

In tankers an alternate hydraulic oil supply must be automatically connected within what time?

2 minutes.

3 minutes.

5 minutes.

45 seconds.

What provides power to the hydraulic emergency steering system?

Accumulators in the hydraulic system.

Battery power to the entire steering system.

Emergency generator running main hydraulic pumps.

Manual operation of main pumps.

What would be the most likely cause of high compressor discharge pressure?

Failure of the expansion value.

Inadequate condenser cooling.

Overcooling of the evaporator return.

Ice formation on the evaporator coils.

Which is the least harmful of these refrigerants?

Freon 12.

Ammonia.

Freon 22.

Carbon Dioxide.

What could cause frost on the discharge side of the expansion value?

Insufficient condenser cooling.

Chamber temperature too low.

The expansion value being dirty or iced up.

Air in the refrigerant system.

Why should refrigeration compressor oil be stored in small capacity drums?

Ease of stowage.

Only small quantities are required.

Refrigerator oil is hygroscopic and should not be stored in part full drums.

Ease of handling.

What would be fitted to relieve excess compressor pressure?

Pressure relief value to atmosphere.

Pressure relief value to suction line.

Bursting disc to condenser inlet.

Bursting disc to compressor suction.

How is an air conditioning compressor normally unloaded?

By throttling the discharge values.

By throttling the suction values.

By holding open the suction values.

By holding open the discharge values.

What kind of metal must never be allowed to come into contact with Freon liquid or Freon gas, and why?

Copper, it has a harmful effect on the Freon.

Iron, it will be rapidly wasted by the Freon.

Aluminium, it dissolves in contact with Freon.

Chromium, it will overheat.

What is the function of the expansion valve?

To increase the pressure of the liquid refrigerant.

To reduce the pressure of the liquid refrigerant.

To regulate flow and reduce the pressure of refrigerant to the evaporator.

To allow the expansion of the high-pressure gas before the condenser.

What is the function of the low-pressure cut-out fitted on the compressor suction line?

Cut-out/cut-in device, no reset required.

Low-pressure shutdown with manual reset.

To prevent over pressure of the evaporator.

Safety shutdown device with manual reset.

What is the function of the HP cutout fitted on the compressor discharge line?

High-pressure shutdown with manual reset.

High pressure cut out with auto cut-in.

By-pass device cutting out the expansion value.

High-pressure alarm device only.

What is the function of the oil differential pressure switch?

To indicate oil is returning from the oil separator.

As warningicut out due to oil foaming.

High temperature alarm.

As a low lub oil pressure shutdown.

What effect has the solenoid stop valve?

ELectrically shuts down the compressor.

Operates the stop value on the compressor discharge line.

Stops the refrigerant from entering the evaporator.

Shuts off the refrigerant on the compressor suction line.

What is the correct SG for brine used as a secondary refrigerant?

1,05.

1,5.

1,25.

1,1.

What determines the brine SG (specific gravity) required?

The carrying temperature of the cargo.

Capacity of refrigerant compressors.

Type of primary refrigerant in use.

Amount of brine in circulation.

What is the required temperature in the ship\'s vegetable room?

From +4 to +6 degree °C.

From +3 to -3 degree °C.

From 0 to +4 degree °C.

From +8 to +12 degree °C.

What is the most usual cause of a restriction at the expansion value?

Moisture in the system.

Insufficient gas charge.

Dirt in the system.

Blockage in the filter/drier unit.

What does the sight glass indicate?

Operation of the expansion value.

Adequate refrigerant charge.

Condition of the filter drier unit.

Condition of the condenser.

Where is the fitter/drier unit fitted?

At the evaporator inlet.

Between expansion value and evaporator.

On the compressor discharge line.

Between condenser and expansion value.

What is the state of refrigerant leaving the evaporator?

Low-pressure liquid.

High pressure gasiliquid mixture.

Gas at high pressure.

Gas at low pressure.

What is the state of the refrigerant flowing from the condenser?

High pressure liquid.

High-pressure gas.

Low pressure liquid.

Gas liguid mixture at evaporator pressure.

Where is the temperature of the refrigerant highest?

At the expansion value.

At the compressor discharge.

At the compressor suction.

At the condenser outlet.

When starting a compressor, why is it necessary for the unloader to be activated before the drain values are closed?

To avoid the safety valves blowing.

To avoid air blowing in the bilges.

So the pumping action can blow the drains through.

To prevent the compressor from tripping.

Which part of the compressor does the unloader act on, and how?

It keeps the DELIVERY VALVES open.

It keeps the SUCTION VALVES open.

It keeps the DELIVERY VALVES closed.

It keeps the SUCTION VALVES closed.

Suppose the delivery air pressure of this compressor is 30,0 bar. Which compressor could this be?

A starting air compressor.

An instrument air compressor.

A service air compressor.

A working air compressor.

What is part number 3 called?

The purifier.
The primary pump.
The clarifier pump.
The secondary pump.

What is shown here?

A common suction mesh strainer.
A Fuel Oil pressure line filter.
A Lubricating Oil pressure line filter.
A centrifugal filter.

What ensures the tightness of the filter cover (1) to the fitter body (3)?

The clamp on top of the fitter cover.
The fitter\'s gasket.
The gasket pressed down by the filter cover\'s clamp.
The vacuum created in the filter.

What type of filter is shown here?

A magnetic fitter.
A cartridge type pressure line fitter.
A suction wire mesh fitter.
A rotating fitter.

What is the correct parts description list of this pressurized filter?

1 = Top plate, 2 = Mesh cloth, 3 = Housing.
1 = Filter cover, 2 = Ribbed cartridge, 3 = Filter body.
1 = Filter top, 2 = Filter cloth, 3 = Housing body.
I = Top cover, 2 = Element, 3 = Cast body.

How is pump \"4\" driven from the purifier?

By being directly attached to the gears of the purifier crankcase.
By electric motor.
By replaceable sheer pins from the purifier crankcase.
By lf-belt.

What is item \'F’ ?

A fuel shut-off solenoid.
A normal mesh filter/strainer.
A fine filter.
A flow meter.

What is the usual inlet temperature of Main Engine lubricating oil to the purifier (Tin)?

70 degree °C.
75 degrees °C.
95 degree °C.
85 degree °C.

When you start a purifier it takes several minutes to accelerate to full speed since the power from the electric motor is transferred by …………. to the purifier?

a magnetic coupling.
friction pads.
a rotating coupling.
the bowl spindle.

What kind of heat exchanger is drawn here?

A plate battery heat exchanger.
A double flow or loop flow tube heat exchanger.
A finned bank block heat exchanger.
A single flow pipe tube heat exchanger.

If the heated medium of this heater is oil and the heating medium is steam, excess steam supply or sufficient oil flow could cause excessive …………... in the heater.

deformation.
corrosion.
carbon formation.
pitting.

What grade of fuel does the temperature of the daily tank suggest is in use?

Marine diesel.
Gas oil.
Distillate diesel.
Intermediate or heavy fuel oil (1 500 - 3 500 sec redwood 1).

What are items ‘F’ ?

Filters.
Flow controllers.
Flow meters.
Fast shut-off values.

What is the function of the lubrication oil sump tank?

To act as as buffer tank of the system oil in use.
As supply source of the system oil.
To collect the system oil in use.
All of these.

What kind of fuel oil system is shown here?

A heavy fuel oil system.
A blend fuel oil system.
A marine diesel oil system.
A gas oil system.

What is the component marked ‘BUC’?

The Blend Unit Caforifier.
The Base Unit Calorifier.
The Basic Unit Controller.
The Blend Unit Controller.

Over which components does the Blending Unit Controller act in order to blend fuel of the required viscosity?

The diesel oil and heavyfuel oil booster pumps.
The steam inlet and return by-pass valves of the fuel heater.
All of these.
The diesel oil and fuel oil inlet valves of the blender.

Where does the blending of fuels take place in this system?

In unit H.
In units DP and FP.
In unit BUC.
In unit BU.

What are the components marked \'M’ ?

Manometers.
Magnetic shut-off values.
Flow meters.
Microprocessors.

What are the components marked ‘F’ ?

Fuel pumps.
Flow meters.
Fuel heaters.
Fuel filters.

Which part of this system is usually heated to 65 degree °C? Study the picture.

The blending unit controller BUC.
The HFO daily tank.
The blending unit BU.
The unit H.

What is the purpose of the Main Engine Dirty Oil tank?

To act as collecting tank from Main Engine scavenge drains.
To act as collecting tank for dirty oil from the Main Engine intend for purification.
To act as a collecting tank for all non-reusable oils.
To act as a drain tank of the piston rod stuffing boxes.

In what kind of piping would you find this type of filter?

In bilge piping.
In fuel oil piping.
In sea water piping.
In starting air piping.

If when you start up a purifier it does not come up to the desired revolutions, or it takes too long a time to come up to the required revolutions, you should change the ………………

friction pad linings.

gravity disc.

purifier ball bearings.

O-rings and seal set of the bowl.

The most common reason for overflow on purifiers is ………………

small bearings worn out.

the wrong gravity disc.

water seal broken.

dirt between the purifier plates.

When the density of purified oil has increased, you should ………….

Increase the temperature and decrease the gravity disc diameter.

Decrease the temperature and decrease the gravity disc inside diameter

Decrease the temperature and increase the gravity disc inside diameter.

Increase the temperature and increase the gravity disc inside diameter.

During start up of a purifier, how will you notice when the bowl has reached the required revolutions?

The crankcase rotating indicator will turn fast.

The starting amperage will drop sharply to normal (1/3 to 1/4) from the starting current.

The purifier will make a humming noise.

The vibrations on the purifier will increase.

Caution must be taken when handling purifiers since errors can cause great danger. Handle with due caution is required in operation, dismantling, assembling, inspection, maintenance. This is because …………….

oils and fuels cause fire and explosion when handled carelessly. This danger is increase because the fuels and oils fed to purifiers is heated.

static electricity may be generated if parts are wrongly assembled causing explosion within the purifier.

danger of electrocution from the electric power supply to driving motor, various control solenoids and other required operational controls is great.

purifier bowls revolve at very high speed causing great centrifugal forces to act, careless handling causes danger of disintegration.

If some part of a purifier bowl assembly is defective, what action should be taken?

Contact the makers for guidance and act on their advise only.

Order the specific bowl spare part.

Have it repaired on board if it can be done.

Sent it to a qualified workshop for repair.

The starting/accelerating current of a purifier is ……………% of the normal operating current.

100.

150.

50.

250.

The time interval for automatic sludge discharge from purifiers must be chosen correctly, in general the more frequent the interval, the better, however intervals too short give bad efficiency, intervals too long …………

will atso give bad efficiency.

may result in overflowing of the purifier due to clogging with dirt.

will result in difficult desludging due to adhesion of sludge.

may result in water seal depletion.

As a rule of thumb, the time interval set for automatic desludging of diesel oil purifiers should be….. hours.

4 to 5.

2 to 4.

6 to 8.

6 to 9.

As a rule of thumb, the time interval set for automatic desludging of 380 cSt heavy fuel oil purifiers should be………. hours.

4 to 6.

1 to 2.

6 to 8.

2 to 4.

As a rule of the thumb, time interval set for automatic desludging of 180 cSt heavy fuel oil purifiers should be………hours.

3 to 5.

2 to 3.

4 to 6.

6 to 8.

As a rule of the thumb, time interval set for automatic desludging of lubricating oil purifiers used on crosshead type engine sumps should be………hours.

As a rule of the thumb, time interval for automatic desludging of lubricating oil purifiers fitted on sumps of trunk-type engines should be set at……….hours.

The factors which determine the selection of the size of gravity disc for a purifier are………..

the oil temperature, the sludge content and the specific gravity.

the bowl speed, the oil temperature and water content.

the specific gravity of the oil, the oil temperature and the feed rate.

the oil temperature, the water and sludge content and the specific gravity.

Oil purifiers can be used for purifying as well as for clarifying operations. The purifying operation is………

the separation of solids from oils with the use of a water barrier seal and is called a two-phase operation.

the separation of solids from liquids and is called a single phase operation.

a 3-phase separating operation of light liquid, heavy liquid and solids (water, oil, dirt).

the separation of light liquids from heavy liquids, (oil from ater) and is called a two-phase operation.

CES – Medium Speed Test Answers (Engine, Management)

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