Welcome to the website where you can pass online the CES test version 6.0.11 on the subject «Deck Operational LPG». 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: 6.0.11.
- Test type: STCW.
- Department: Deck.
- Level: Operational.
- Type: LPG tanker.
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 «Deck Operational LPG». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Deck Operational LPG» subject includes theoretical and practical information about advanced training for work on any type of vessel. This test evaluates theoretical knowledge and practical skills required for safe LPG handling on liquefied gas carriers. It covers key topics such as cargo operations, tank pressure management and emergency procedures specific to LPG vessels. Candidates will be assessed on their understanding of gas properties, hazards and relevant international regulations (IGC Code, SOLAS). Practical scenarios include simulating leak detection, valve operations and risk mitigation during loading/unloading. The test ensures compliance with STCW advanced training requirements for deck officers serving on LPG tankers. Questions may involve case studies on collision safety, inert gas systems and fire prevention in gas carrier operations. Successful completion certifies competency to work with LPG cargo on both fully refrigerated and semi-pressurized vessels. The assessment combines multiple-choice questions, diagrams and situational judgment tasks for comprehensive evaluation.
On this site Crew Evaluation System Test on the subject «Deck Operational LPG» contains 630 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.
The test includes three modes. In the Training mode, you go through all questions with the option to take a hint, while in the Exam mode, this option is not available. We have also developed another mode – Wild, where you can answer all the questions available in the test at once. Enjoy!
Choose the regime, in which you want to pass CES test:
Training
Exam
Wild Mode
Use the search below to find question.
Amount of questions: 630.
Right answers marked with this sign .
SVI4usLd A ship is turning slowly with the rudder hard over and the propeller stopped. What can be done to increase the rate of turn but not the forward speed?
Give the engine a short full ahead.
Give half astern on the engine.
Increase the rudder angle.
Reduce the weight on board.
9RZWr3fT What does this signal flag indicate when seen on a vessel in a port approach?
I am in distress and require immediate assistance.
The vessel is anchored and not in motion.
The vessel is signaling for a pilot.
The vessel is ready to dock.
LzBp7uzZ The ship is navigating in dense fog where the visibility is less than one mile. The Arpa radar is set on a range 12 miles on a course of 314 degrees and own ship has a vector as shown. What is the vector mode selected on the Arpa?
True vectors.
Relative vectors.
No vectors displayed.
Both true and relative vectors.
6DLYY5EX Why should a Ground Stabilised True Motion radar display not be used for anti-collision purposes?
The "aspect" of the target is confused, so the Regulations for Preventing Collisions cannot be accurately applied
True motion does not provide the collision risk of targets as only true vectors are available.
It is not suitable for long-range detection.
It requires constant manual adjustment.
va2giHzM Semi-pressurised liquefied gas carriers are often fitted with direct, single stage reliquefaction plants for cooling the cargo and dealing with boil off vapours. What cooling medium is usually used in the condenser to condense the cargo vapours for this type of system?
Sea water.
Refrigerant gas.
Fresh water.
Air.
2Tr5ZYSq The water content of inert gas is important when the gas is used for cargo tank inerting and drying operations on a liquefied gas carrier. Which drier arrangement for the inert gas will result in the lowest water content and dew point of the inert gas?
A refrigerated drier followed by an absorption drier in series can reduce the dew point to less than minus 40 degrees C.
An absorption drier followed by a refrigerated drier in series can reduce the dew point down to less than minus 40 degrees C.
A single absorption drier can achieve the same results.
A refrigerated drier alone is sufficient for drying inert gas.
ZH7e6j0Q What is the main difference between "Independent Tank Type A" and "Independent Tank Type C" liquefied gas cargo tanks?
Type A tanks require a secondary barrier. Type C tanks do not.
Type C tanks are suitable for carrying fully refrigerated cargoes. Type A tanks are not suitable for carrying cargoes below minus 10 degrees C.
Type A tanks are larger than Type C tanks.
Type C tanks are designed for higher pressures than Type A tanks.
DX1bcJAL Independent tanks are used in the cargo containment system of some liquefied gas carriers. Are all independent tanks self-supporting?
Yes, all independent tanks are self-supporting.
No, none of the independent tanks are self-supporting.
Some independent tanks are self-supporting, while others are not.
Independent tanks require external support structures.
m$1FiV8N What is normally meant when a cargo tank on a liquefied gas carrier is said to be in a gas free condition according to the IMO Gas Codes?
The tank atmosphere has first been inerted and then fully aerated and contains only fresh air.
All traces of cargo gases have been removed and the tank only contains inert gas or nitrogen.
The tank is filled with water to remove any residual gases.
The tank is sealed and monitored for gas leaks.
VbsXyAPe When a character in the NAVTEX message sent is not received in the proper way:
Nothing or a special character will be printed
The message will not be printed at all until, with repeated transmission, it can be automatically compared and corrected.
The message will be printed with an error indication.
The message will be discarded and not saved.
9ZlHyuX3 The transmitting receiving method, when both stations can transmit and receive at the same time is called:
Duplex
Simplex.
Half-duplex.
Multiplex.
qWXQRu3D Which of the following two digits codes is used to obtain maritime assistance?
39
38.
37.
36.
gpoUBvTK As regards the launching and recovery arrangements for rescue boats which is required among the following?
Means shall be available to prevent any discharge of water on to survival craft during abandonment.
Launching and recovery arrangements shall be such that they can be operated at all times from the bridge.
The rescue boat must be launched within 5 minutes of an emergency.
All crew members must be trained in the use of the rescue boat.
Kt7zvacT Hand flares and buoyant smoke signals can continue to burn or emit smoke after having been immersed for a period of 10 s.
Right if the immersion depth is smaller than 100 mm.
Right.
Wrong.
Wrong if the signal is fully submerged.
6On#gyF2 When mustered to an abandon ship drill, what is the first thing you do when entering the muster station?
Put on a life jacket.
Report your presence.
Check the emergency equipment.
Wait for further instructions.
owSEBOF7 When is a visitor onboard required to present an ID?
On SECURITY Level 1, 2 & 3.
On SECURITY Level 2 & 3.
Only on SECURITY Level 3.
When specifically requested by the crew.
5MaxNa08 What features of the vessel hull, equipment and cargo causes error on a vessel's standard magnetic compass?
Permanent and induced magnetism found in steel or iron on-board
The shape of the hull.
The type of cargo being carried.
The vessel's speed and heading.
WuSGNNNG Super-refraction effects the performance of some bridge devices on the vessel. What should the bridge watchkeeper look out for?
Abnormal ranges of VHF radio and very long range radar detection
The radar will show abnormal sea clutter as the pulse is trapped in an atmospheric layer.
Increased frequency of false alarms on the radar.
Changes in the vessel's speed and heading.
bD7tHrtO The strength of the wind is related to the air pressure gradient between different pressure systems, which one of the following statements is correct?
The closer the isobars on a weather map are together, the greater is the pressure gradient
A great pressure gradient is found in areas where the isobars on a weather map are far apart.
Wind strength is not affected by the pressure gradient.
Isobars do not indicate pressure gradients on weather maps.
zFbNlcFi Gassing up is one of the operations that may be required before loading a cargo of LPG. What is the main reason for gassing up cargo tanks on refrigerated LPG carriers before loading the cargo?
To remove the inert gas, which may contain incondensable elements, from cargo tanks.
To cool down the cargo tanks to the carriage temperature and so reduce thermal stress.
To prepare the tanks for inspection.
To increase the pressure in the tanks for loading.
XpkEUIku You are proceeding along a coastal route when you hear this signal. The visibility is severely restricted. What does the signal mean?
There is a vessel aground in the vicinity. She is more than 100 metres in length. She is sounding an additional warning to approaching vessels that they are "running into danger"
There is a vessel at anchor in the vicinity. She is more than 100 metres in length. She is sounding an additional warning signal to approaching vessels, directing them to "keep clear".
There is a fishing vessel in the area that is restricted in its ability to maneuver.
There is a vessel underway that is signaling for assistance.
bpgftsqC What would be the correct form of response to the question: What is the visibility in your position?
The correct form of response would be: Visibility in my position is two hundred meters
The correct form of response would be: Visibility is okay.
The correct form of response would be: Visibility is good.
The correct form of response would be: Visibility is satisfactory.
e$MeMGuv Whilst on passage, if the visibility unexpectedly reduces to less than 2 miles, what should the OOW do?
Inform the master
Switch on a radar.
Reduce speed and maintain course.
Sound the fog signal.
8rvt04pG If the vessel is floating in water other than salt water having a specific gravity of 1,025 then:
The vessel's draught must be corrected to the equivalent salt water draught prior to entering the KG curve
The vessel's GM must be corrected to the equivalent salt water draught prior to entering the KG curve.
The vessel's stability calculations are not affected by the water type.
The vessel should not enter the KG curve at all.
wWtojlwr Once the Safety Management System is verified and working effectively, what document is issued to the ship?
The Safety Management Certificate
The Document of Compliance.
The International Safety Management Code.
The Safety Management Plan.
Code: vqb5HW8z On a container vessel, the description of a consignment of dangerous goods shows P in the IMDG Dangerous Goods List Column 4. What does the letter P indicate?
The substance is a Marine Pollutant.
The substance is poisonous.
The substance is in powder form.
The consignment is in a pressurised container.
Code: SLPvywsn Under the ISM Code the provision of individual control measures for specific work-related tasks exist in the:
Permit to Work system.
Due diligence clause.
Definition of supervisory responsibilities.
Documentation of individual job descriptions.
Code: EvVKhNI4 What is the normal name of the waterproof suit shown in the picture?
Immersion suit.
Life suit.
Dry suit.
Wet suit.
Code: mqsqn6eH What is the daytime signal to be shown when the vessel is at anchor?
Two black balls where they can best be seen.
A black diamond forward where it can best be seen.
A black ball forward where it can best be seen.
The national flag flying from the fore most.
Code: KW#4I3TO In the diagram, which letter is indicating the "bitts" which would probably be used by the mooring the ship?
The bits for the Forward Spring is indicated by B, in the figure.
The bits for the Forward Spring is indicated by C, in the figure.
The bits for the Forward Spring is indicated by A, in the figure.
The bits for the Forward Spring is indicated by D, in the figure.
Code: FNg6#L6q On a vessel, where is the "boat deck" located?
It is the deck of a life boat giving access to un-hook the boat.
It is on the side of the accommodation from which persons embark into the lifeboats.
It is the lowest deck on the accommodation of a vessel where access is gained from a boat alongside.
It is the name of the main deck of the ship or boat.
Code: 9BHqKdzi How would you alert others on board if you saw a person falling overboard?
If I saw a person falling overboard I would run to the Bridge.
If I saw a person falling overboard I would shout once "Man overboard".
If I saw a person falling overboard I would shout repeatedly "Man overboard".
If I saw a person falling overboard I would inform the Bosun.
Code: 8y1bLUDf What is understood by the term "the Lee Side"?
It is the side with the wind on it.
It is the side opposite the wind.
It is the starboard side of the vessel.
It is the port side of the vessel.
Code: kS1kAfST Why could dirty and oily areas of the deck be dangerous?
They may cause people to slip over and hurt themselves.
They show the ship is not efficient.
They are areas which should be cleaned up.
They do not look good to the customers.
Code: LMBqQISK What do you understand by "Bitter end"?
Bitter end means: the end link of an anchor cable that is secured within the chain locker.
Bitter end means: a foul taste at the end of a meal.
Bitter end means: the toggled end of a lifeboat painter.
Bitter end means: to the very last moment.
Code: SMF$8083EN During an anchoring operation, what does the bridge team mean when they ask "How is the chain leading"?
The Master is asking the Chief Officer whether the ship needs to be moved forward and take the weight off the anchor cable.
The Master is asking the Chief Officer whether the vessel is dragging anchor.
The bridge would like to know the direction of the anchor cable from the hawse pipe.
I don't know.
Code: rZt#A4Hz What do you call the wide rung on a pilot ladder that prevents the ladder from twisting?
The wide rung on a pilot ladder that prevents it from twisting is called a "Wide step"
The wide rung on a pilot ladder that prevents it from twisting is called a "Long rung"
The wide rung on a pilot ladder that prevents it from twisting is called a "Spreader".
The wide rung on a pilot ladder that prevents it from twisting is called a "Ani-twist rung"
Code: R$aCbaXJ On the diagram, what is the area at the forward end of the vessel shown by the letter "A"? It is normally raised by one deck above the main deck.
Poop.
Crows nest.
Forward bridge.
Fo'csle or Forecastle.
Code: oROnIRtU Where is the "PORT QUARTER", in the figure?
The Port quarter is D in the figure.
The Port quarter is A in the figure.
The Port quarter is B in the figure.
The Port quarter is A in the figure.
Code: 7UjcYq2Z What is name of the machine shown, used to heave on the ropes during mooring and unmooring?
Crane.
Winch.
Windlass.
Capstan.
Code: ZJ3jNAcU Which is the "CAPSTAN" in the figure?
The Capstan is indicated by B in the figure.
The Capstan is indicated by A in the figure.
The Capstan is indicated by C in the figure.
The Capstan is indicated by D in the figure.
Code: hRpnAXNP In the diagram, which letter is indicating the position "MIDSHIPS"?
Midships is indicated by D in the figure.
Midships is indicated by C in the figure.
Midships is indicated by A in the figure.
Midships is indicated by B in the figure.
Code: xWaGrnSFR When keeping a lookout, what would be the correct understanding of the question "What is the aspect of the other ship"?
The question is requesting where on the horizon the other ship was sighted.
The question wants to know what type of ship has been sighted.
The question is requesting some idea of how far away the other ship is from your own ship.
The question is requesting some indication of what lights or part of the vessel is seen.
Code: m9lvxTiq What is understood by the term "take the helm"?
Take over the steering of the ship.
Take over heaving of a rope.
Change the place where the lookout is standing.
Take a message to another officer.
Code: eOGcnaCR Would there ever be the need for two lookouts on the Bridge watch?
Every night there should be two lookouts, one on each bridge wing.
Never necessary.
Yes, possibly whne there is dense fog and heavy traffic.
No, one lookout is sufficient even in fog.
Code: j3eTfjfa Your vessel is power-driven and making way in open water. This vessel is sighted wide on the port bow. It's bearing is opening, but its distance is closing rapidly. Which of the following is a correct assessment of the situation and the action to be taken?
Risk of collision is deemed not to exist and I will maintain my course and speed. I will continue to monitor the situation.
Risk of collision is deemed not to exist. However, to be sure of a safe passing distance, I will reduce my speed to allow the other vessel to pass ahead.
Which spaces, in regard to fire protection, shall be separated from the rest of the ship by thermal and structural boundaries? (SOLAS II-2/2.2.2)
Accommodation.
Don't know.
Machinery spaces.
Cargo holds.
What quantity of reserve fuel is to be available for diesel driven fire pumps outside of the main machinery space? (SOLAS II-2/4.3.3.2.4)
Sufficient amount for fifteen hours operation at full capacity.
Don't know.
Sufficient amount for ten hours operation at full capacity.
Sufficient amount for twenty hours operation at full capacity.
The lights here show those that must be exhibited by a vessel engaged in towing, as per rule 24 of the International Collision Regulations. But how long is the tow behind this vessel?
It is between 100 and 150 metres.
It exceeds 200 metres.
Don't know.
It is less than 100 metres.
A man is reported to have fallen overboard and the Officer of the Watch releases the lifebuoy and starts a man overboard manoeuvre, who are the first persons onboard he should inform?
Master and Engine Room.
Don't know.
Deck crew and safety officer.
Chief Mate and radio operator.
What can be used to reduce the effect of the state of sea-waves?
Saltwater solution.
Vegetable/Fish Oil.
Don't know.
Heavy machinery.
What is EPIRB an abbreviation for?
Emergency Position Indicating Radio Beacon.
Don't know.
Emergency Protocol Information Radio Beacon.
Emergency Position Indicator Radio Band.
Two vessels are meeting each other in confined waters. What would be the effects of interaction between the two vessels as they approach each other?
The vessels will collide.
The bows of the ships will be pushed away from each other.
Don't know.
The sterns of the ships will be pushed together.
Where would the "pivot point" be considered to be located when the ship is proceeding at full speed ahead and there is no wind or current?
At about 1/6 of the ship's length from the bow.
Don't know.
At the midpoint of the ship.
At about 1/4 of the ship's length from the stern.
If your vessel is fitted with wires on self-stowing 'split drum' winches, the advantage of having these split drum winches is:
Increased efficiency in handling lines.
All the listed alternatives.
Don't know.
Reduced wear on the wires.
One of the main components in a liquefied gas carrier reliquefaction plant is the cargo condenser. Which of the following would be the probable cause of too high a pressure in a sea water cooled cargo condenser?
Incondensable vapour mixed in with the cargo vapour.
Don't know.
Insufficient sea water flow to the condenser.
Excessive cooling of the cargo vapour.
What should be the status of cargo compressors for handling liquefied gas cargo vapours prior to start up?
They should be in standby mode.
They should be unloaded.
Don't know.
They should be fully loaded.
Abdominal Thrust is the name on a technique which involves applying a series of thrusts to the upper abdomen in an attempt to force air out of a choking casualty's lungs. How to perform this technique?
Stand behind the casualty. Clench your fist with the thumb inwards in the center of upper abdomen. Grasp your fist with your other hand and pull quickly inwards.
Don't know.
Stand in front of the casualty and push down on their shoulders.
Sit the casualty down and encourage them to cough.
Shock is a manifestation of changes in which the circulation fails because either pressure or volume of circulating blood has fallen to a dangerous level. What is the skin colour of a patient in shock?
Red and flushed.
Pale or grey.
Don't know.
Yellowish or jaundiced.
Code signals concerning requests and general information on medical matters normally consist of:
Letter M plus two other letters.
Don't know.
A single letter followed by a number.
Three numbers in sequence.
Which approved publication should be used by a seafarer to help overcome any misunderstanding in communications?
The International Maritime Code.
The (IMO) Standard Marine Communication Phrases (SMCP) booklet
Don't know.
The Maritime Safety Manual.
An Oil Record Book, Part 1, shall be provided to every ship of 400 tons gross tonnage and above to record machinery space operations. Out of below mentioned operations, it is compulsory to record:
Bunkering of bulk lubricating oil.
Don't know.
Discharge of bilge water.
Transfer of fuel oil between tanks.
Which of the following figures drawn on the plane of the Meridian is correct for an observer in position Latitude 30°00' North; Longitude 15°00' West, when observing the sun on the meridian, if the sun's Declination is 15°00' South?
Figure 1 is correct.
Figure 4 is correct.
Don't know.
Figure 3 is correct.
Which of the four calculations illustrated is the correct one to determine the latitude of the observer when the sun is on the meridian?
Calculation 1 is correct.
Calculation 3 is correct.
Don't know.
Calculation 4 is correct.
Deepwell and submerged pumps are the most common types of cargo pump fitted on liquefied gas carriers. What is the main difference between deepwell and submerged cargo pumps?
Deepwell pumps are connected to the deck mounted motor with a long shaft and submerged pumps have both pump and motor at the bottom of the tank.
Don't know.
Deepwell pumps are more efficient than submerged pumps.
Submerged pumps are used for heavier liquids than deepwell pumps.
What are the requirements for heat exchangers that are used for heating the cargo during cargo handling operations on an LPG carrier?
They must be made of stainless steel only.
They must be designed to withstand the expected operating conditions with respect to pressure and temperature and the materials must be compatible with the cargo.
Don't know.
They should be insulated to prevent heat loss.
Some liquefied gas carriers are fitted with cascade type direct cooling plants to meet cargo vapour reliquefaction requirements. What is the cargo vapour normally condensed against in a cascade type cooling plant?
A commercial refrigerant gas.
Don't know.
Sea water.
Fresh water.
Some liquefied gas carriers use prismatic tanks for the cargo containment system. What is the main reason for including a longitudinal bulkhead in prismatic cargo tank designs?
To reduce 'sloshing' in the tanks due to the free surface effect.
Don't know.
To increase the tank's structural integrity.
To facilitate easier loading and unloading of cargo.
Is there any special area under MARPOL where it is forbidden to pump out any sludge or oil residues?
There are special areas where it is forbidden to pump out any sludge or oil residues.
Don't know.
It is allowed to pump out sludge in all areas.
Only in port areas is it forbidden to pump out sludge.
Cargo compressors are often used to handle cargo vapour on LPG carriers. How is liquid cargo prevented from entering the suction side of the cargo compressor?
By using a filter in the suction line.
By fitting a liquid separator in the vapour line between the cargo tank and the compressor.
Don't know.
By maintaining a high pressure in the cargo tank.
How is overfilling of the cargo tanks on a liquefied gas carrier prevented?
The tank filling valves are automatically closed if the tank overfill sensor is actuated.
Don't know.
By manually monitoring the filling process.
By using a pressure relief valve.
Where on board can you find information regarding the different types of safety equipment, such as location, quantity, etc.?
The crew handbook.
The ship’s safety plan.
Don't know.
The ship’s logbook.
LPG and other liquefied gases are often transported by sea on fully refrigerated gas carriers. What is the generally accepted definition of a fully refrigerated gas carrier?
A gas carrier, fitted with a reliquefaction plant, and designed to carry liquefied gases at the boiling temperature and at pressures slightly above atmospheric.
Don't know.
A gas carrier that operates at high pressures only.
A gas carrier designed to carry gases in their gaseous state.
The IMO Standard Marine Communication Phrases are recommended to be used when the ship's Officer is verbally talking to whom?
In circumstances described in all of the answers provided.
Don't know.
Other ship's officers only.
Port authorities only.
What is the meaning of this symbol?
Lifeboat station.
Embarkation ladder.
Don't know.
Fire exit.
What is the most important reason for shutting off the source of fuel before extinguishing the flames on a cargo fire on a liquefied gas carrier?
To prevent forming a potentially flammable gas cloud.
Don't know.
To ensure the fire burns out quickly.
To reduce the risk of explosion.
A vessel is equipped for all sea areas. In the middle of the Indian Ocean the EGC receiver appears out of order. Is it still possible to receive MSI-messages?
Don't know.
Yes, with the MF/HF-radio telex.
Yes, but only through satellite communication.
No, it is not possible to receive any messages.
In the radio telex-traffic the landline-connection with a subscriber ashore will be broken with the following command:
Don't know.
kkkk
Disconnect.
Terminate connection.
A DSC-notice should be sent on VHF-channel:
Don't know.
70
16.
22.
A received DSC ‘distress alert’ contains the following information: “UNDESIGNATED DISTRESS” Of this distress case:
The nature of distress is unknown.
Don't know.
The vessel is sinking.
There is a fire on board.
A distress alert has accidentally been sent with the Inmarsat-C installation. One should now:
Don't know.
Make contact with an RCC.
Wait for a response.
Turn off the Inmarsat-C system.
The transmitting receiving method, when both stations can transmit and receive at the same time is called:
Duplex.
Don't know.
Simplex.
Half-duplex.
When onboard channel 16 is used for a shore radio-connection, you always work:
Don't know.
Simplex.
Duplex.
Half-duplex.
To prevent overload of the MF/HF transmitter:
Clean the dust filter of the fan regularly.
Don't know.
Ensure the transmitter is turned off when not in use.
Use the transmitter only during daylight hours.
A SART must, when the vessel sinks:
Don't know.
Be taken by the crew to the rescue-boat and turned on manually.
Automatically activate when submerged.
Remain on the vessel until rescue arrives.
When steering by autopilot, how often should manual steering be checked?
At least once a watch.
Don't know.
Every hour.
Only when changing course.
What action should the Officer of the Watch (OOW) take if he is forced to make a major deviation from the voyage plan?
Don't know.
Inform the Master.
Document the deviation in the logbook.
Notify the crew of the change.
What is the meaning of the abbreviation "RQ" at the end of a DSC sequence?
Acknowledgement request.
Don't know.
Radio quality.
Request for confirmation.
The frequency 121,5 MHz is used for:
Don't know.
SARSAT-COSPAS EPIRBS.
VHF marine communications.
Weather broadcasts.
The hydrostatic release of an EPIRB should be changed:
Every two years.
Don't know.
Every year.
Every five years.
How will you start a cancelling message after you send by mistake a distress call on your VHF DSC equipment?
Don't know.
"Emergency - This is 'SAINT-ROMAIN'."
"Distress call cancelled - This is 'SAINT-ROMAIN'."
"All Stations - This is 'SAINT-ROMAIN'"
Which of the following spaces may be protected by a fixed carbon dioxide (CO2) fire-extinguishing system?
Machinery spaces of category A.
Don't know.
Accommodation spaces.
Control rooms.
What are the tricing pendants made for?
Don't know.
To secure the lifeboat during rough weather.
To assist in the lowering of the lifeboat.
They automatically prevent any gap between the ship side and the lifeboat at the first stage of its launching.
As regards the launching and recovery arrangements for rescue boats, which is required among the following?
Means shall be available to prevent any discharge of water on to survival craft during abandonment.
Don't know.
The rescue boat must be equipped with a radio.
The rescue boat should have a minimum of two crew members.
Give the meaning of the following symbol:
Don't know.
Emergency signaling device.
Lifeboat communication system.
Survival craft portable radio.
What does ISM stand for?
The International Management Code for the Safe Operation of Ships and for Pollution Prevention.
Don't know.
International Safety Management.
Integrated Ship Management.
What do you understand by the term “Risk Assessment”, and how would this be carried out on board?
Don't know.
Conduct regular safety drills.
Ensure all crew members are trained in safety procedures.
Identify the hazards, quantify the risks, put control measures in place, monitor the work activity and review.
What is the minimum number of channels required for the portable two-way VHF's for survival craft?
Channels 6, 13 & 16.
Don't know.
Channels 1, 2 & 3.
Channels 14, 15 & 17.
Which of the following precautions should be taken when work is to be carried out on the radar scanner unit on the mast?
A "Not to be used" sign on all radars and fuses for the complete radar systems to be removed.
Don't know.
Ensure the radar is turned on for testing.
Work can be done without any special precautions.
An alarm signal consisting of seven short blasts followed by one long blast is sounded by the ship's whistle and the alarm bells. What are you to do?
Go to your lifeboat station (muster station).
Don't know.
Remain in your cabin until further notice.
Proceed to the upper deck for instructions.
Which Security Levels requires the highest security alert?
Don't know.
Security Level 1.
Security Level 2.
Security Level 3.
Which of these are indications that a parcel is suspicious?
The parcel is addressed to no one in particular, arrives unexpectedly and seems heavy for its size.
Don't know.
The parcel has a bright color and is wrapped in shiny paper.
The parcel is sent from a known sender.
Which part of the magnetic compass error changes with a change in the course steered?
Don't know.
Variation.
Magnetic error.
Deviation.
Where can the size of the Magnetic Compass Error be found?
By taking a transit bearing of two fixed geographical positions and comparing it with the bearing of the same points on the chart.
Don't know.
By checking the compass against a known reference point.
By using a GPS device to compare readings.
Which of the answers best summarises the information which should be provided for the bridge Officers of the Watch within an effective Voyage plan?
All of the suggested answers.
Don't know.
Only the weather conditions and navigational hazards.
The estimated time of arrival and fuel consumption.
When the temperature of the air increases with height it is known as a "Temperature Inversion" and may influence the performance of some instruments on the ship. What should the bridge Officer of the Watch be prepared to happen?
Don't know.
Increased fuel consumption.
Changes in wind direction.
Abnormal ranges of VHF RT and Second Trace Returns on the radar.
What is the depth of an iceberg below the surface of the sea?
The draught of an iceberg varies with the type of berg and its age.
Don't know.
Icebergs are always 90 % below the surface.
Icebergs are made entirely of fresh water.
What action should be taken by the Officer of the Watch in the event of fire being reported to the bridge during the 00.00 to 04.00 watch?
Evacuate all crew members to the lifeboats.
Call the captain immediately.
Don't know.
Sound the Fire Alarm.
Which of the suggested navigational systems is a "Hyperbolic" navigational system and has hyperbolae as position lines?
Loran C.
Don't know.
GPS is a hyperbolic system.
Radar is used for hyperbolic navigation.
When using the echo sounder in a river the soundings indicated may be incorrect, what would be the most probable cause of the error?
The type of echo sounder used.
The speed of the vessel.
Don't know.
The density of the water.
What can be done to minimize the reduction of GM due to free surface?
Reduce the number of slack tanks.
Don't know.
Increase the size of the tanks.
Use heavier materials.
How can an approximate value of the initial transverse Metacentric Height (GM) be found from the Curve of Statical Stability (GZ curve)?
Don't know.
Measuring the area under the curve.
Calculating the weight distribution.
Drawing a tangent to the curve through the origin and erecting a perpendicular through the angle of heel of 57,3 degrees
Gassing up is one of the operations that may be required before loading a cargo of LPG. What is the main reason for gassing up cargo tanks on refrigerated LPG carriers before loading the cargo?
Don't know.
To remove the inert gas, which may contain incondensable elements, from cargo tanks.
To cool down the cargo tanks.
To increase the pressure in the tanks.
What is the maximum allowable tank design pressure in the vapour space for Independent Type "A" cargo tanks as used on many LPG carriers?
Don't know.
0,7 barg
1,0 barg.
0,5 barg.
What is the requirement for Independent Tank Type "A"?
Don't know.
A primary and complete secondary barrier.
A single wall with no barriers.
A flexible membrane system.
What would normally be the cargo carriage condition for liquefied gas cargoes carried in membrane type tanks?
Don't know.
Fully refrigerated and approximately atmospheric pressure.
Pressurized at high temperatures.
Heated and under vacuum.
What are the features of the common saturated hydrocarbon cargoes (e. g. propane and butane) that are carried on these vessels?
Don't know.
As liquids they are colourless, odourless and are chemically non-reactive.
They are highly reactive and have strong odors.
They are colored and have a strong smell.
What is the purpose of the discharge booster pump as fitted to some LPG carriers?
Don't know.
To increase the manifold pressure to allow discharge to pressurised storage tanks ashore.
To reduce the pressure in the cargo tanks.
To circulate the cargo within the tanks.
What action will you take under the International Collision Regulations and why?
Don't know.
I will keep out of her way. I am the overtaking vessel and am obliged to keep clear under rule 13.
I will maintain my course and speed.
I will sound my horn to signal my presence.
Under the ISM Code the provision of individual control measures for specific work-related tasks exist in the:
Don't know.
Permit to Work system.
Safety Management Plan.
Risk Assessment Procedure.
The term ‘Fresh Water Allowance’ can be defined as:
The amount of fresh water a vessel can carry.
The difference in density between fresh and salt water.
Don't know.
The number of millimetres by which a vessel's True Mean Draught changes when she passes from salt water to fresh water, or vice versa.
You see this flag hoist on a vessel moored on a berth ahead. What does it mean?
Don't know.
You should proceed at slow speed when passing me.
You must stop your vessel immediately.
You are required to anchor until further notice.
What does this signal hoist mean?
I am preparing to depart.
I am anchored and cannot move.
Don't know.
I require immediate assistance.
What does the word "pyrotechnics" mean?
Don't know.
Pyrotechnics are the items which are capable of self-contained chemical reactions for the production of heat, light, smoke and/or sound.
Pyrotechnics refer to the study of fireworks only.
Pyrotechnics are used exclusively in military applications.
What do you understand by the initials: EPIRB?
This refers to an Emergency Protocol for International Rescue Boats.
This stands for Emergency Procedures in Radio Broadcasting.
Don't know.
This means: Emergency Position Indicating Radio Beacon.
The use of combustible material is restricted in the accommodation spaces in order to:
Don't know.
Contain and suppress fire and explosion in the compartment of origin.
Improve the aesthetic appearance of the accommodation.
Reduce the weight of the vessel.
Select the one option which correctly completes the following statement: A portable ladder _______.
Should be secured before working from it.
Don't need to be checked for stability.
Can be used without any safety measures.
Don't know.
Minimum knowledge is:
He only needs to know how to start the engine.
He should be familiar with the engine room layout only.
Don't know.
He shall have all the knowledge as listed in the other alternatives.
Who are the first persons onboard he should inform?
Master and Engine Room.
Don't know.
The crew members on the deck only.
The passengers on board.
What can be used to reduce the effect of the state of sea-waves?
Bilge water treatment system.
Vegetable/Fish Oil.
High-pressure water jets.
What is SITREP an abbreviation for?
Safety and Inspection Report.
Situation Report.
Signal Transmission Reply.
What is the purpose of a sea anchor?
To keep the lifeboat steady against the sea/wind.
To increase the speed of the lifeboat.
To signal for help using radar reflectors.
Two vessels are meeting each other in confined waters. What would be the effects of interaction between the two vessels as they approach each other?
The bows of the ships will be pushed away from each other.
Both ships will immediately stop due to water resistance.
The bows of the ships will be pulled towards each other.
The ship is drifting in the open sea with a temporary engine breakdown. The ship is equipped with GPS navigation equipment. What should the bridge Officer of the Watch do in this situation?
Notify the cook to prepare emergency rations.
All of the possible answers.
Turn off GPS to save power.
What depth of water would be considered as "Shallow Water" in relationship to a change of the ship's manoeuvring characteristics?
When the "Under Keel Clearance" is less than 50 % of the draught of the ship.
When the depth of water is more than 100 meters.
When the ship is closer than 5 nautical miles from shore.
What percentage of anti-freeze fluid (ethylene glycol) is added to an LPG compressor cooling-water system to give the best protection against ice formation in the cooling system?
60-70 %.
10-20 %.
85-95 %.
At what temperature would a fully refrigerated cargo of propane normally be carried on a liquefied gas carrier?
minus 10 °C.
minus 43 °C.
0 °C.
What would be the normal carriage temperature for a fully refrigerated cargo of ammonia on a liquefied gas carrier?
minus 20 °C.
minus 33 °C.
minus 50 °C.
Which PPM is allowed for discharging of "Bilge Water" overboard?
15 PPM.
50 PPM.
100 PPM.
What are class "C" bulkheads?
Bulkheads constructed of approved non-combustible materials but do not meet any of the requirements relative to smoke and flame nor limitations relative to temperature rise.
Bulkheads made of combustible materials with fire-retardant paint.
Bulkheads that fully prevent the passage of smoke and fire for 2 hours.
What is the purpose of the radiotelephony two tone alarm?
Signal a fire emergency in the engine room.
Activate bridge watchkeeping receivers and attract the attention of the person on watch.
Indicate a successful radio communication.
What does this two flag hoist signal indicate?
I am in distress and require immediate assistance.
I am proceeding with caution.
All clear, no danger.
You are proceeding along a narrow channel and approaching a bend, on the inside shore of which is a large hill, which obsures your view further up channel. What sound signal will you make to indicate your presence to any vessel that is behind the obstructing hill?
One short blast.
One prolonged blast.
Two short blasts.
Which of the following figures drawn on the plane of the Meridian is correct for an observer in position Latitude 30°00' North; Longitude 15°00' West, when observing the sun on the meridian, if the sun's Declination is 15°00' South?
Figure 2 is correct.
Figure 4 is correct.
Figure 1 is correct.
What corrections must be applied to the echo sounder reading to compare the depth of water with the depth printed on the chart?
Sound speed variations due to temperature.
Draught of the ship.
Atmospheric pressure changes.
The OPA-90 notification requirement is:
Notify as soon as you have knowledge of any spill, or threat of a spill.
Notify only after the spill has reached shore.
Notify after completing the cleanup operation.
Deepwell and submerged pumps are the most common types of cargo pump fitted on liquefied gas carriers. What is the main difference between deepwell and submerged cargo pumps?
Deepwell pumps are connected to the deck mounted motor with a long shaft and submerged pumps have both pump and motor at the bottom of the tank.
Deepwell pumps operate only in fresh water tanks.
Submerged pumps require external cooling systems.
On which type of gas carrier can spherical tanks be used for the cargo system?
Only on semi-pressurised gas carriers.
Spherical cargo tanks can be used for fully refrigerated, semi-pressurised/semirefrigerated and fully pressurised gas carriers.
Only on fully pressurised gas carriers.
From which locations is it normally possible to close watertight doors?
Watertight doors can be closed adjacent to the door and remotely from bridge and also one emergency remote control station.
Only manually from the engine room.
Automatically only during ship’s docking.
The cargo tank pressure reading for a refrigerated cargo of propane is higher than the saturated vapour pressure for the cargo temperature. e. g. an absolute pressure of 1,5 bar at minus 43 degrees °C. If the cargo tank had been cleaned before loading the cargo what is the likely cause of this condition?
Cargo temperature sensor malfunction.
Some inert gas or nitrogen remained in the tank after gassing up.
Leakage in the tank pressure valve.
What is normally meant when a cargo tank on a liquefied gas carrier is said to be in a gas free condition according to the IMO Gas Codes?
The tank atmosphere has first been inerted and then fully aerated and contains only fresh air.
The tank contains a mixture of inert gas and cargo vapour below explosive limits.
The tank has been filled with nitrogen only.
It is important that the liquid level in the cargo tanks of a liquefied gas carrier is accurately monitored. The IMO Gas Codes identify level gauging systems as either indirect, closed non-penetrating, closed penetrating or restricted. What feature of the restricted type distinguishes it from the other types?
It uses remote electronic sensors only.
Liquid cargo or cargo vapour is released during operation of the restricted type.
It has no direct contact with the cargo or vapour.
Is it possible to discharge a liquefied gas carrier with a fully-refrigerated cargo by pressurising the vapour space if the cargo discharge pumps have failed?
Only if the cargo containment system has Independent Type C tanks.
Yes, on any type of containment system.
No, pressurising vapour space is never allowed.
Some LPG carriers are designed with semi-membrane tanks. How would LPG normally be carried in semi-membrane tanks?
The LPG would be carried at ambient temperature.
The LPG would be fully refrigerated.
The LPG would be carried under high pressure only.
Which is the "CENTRE LINE", in the figure?
The Fore and aft Centreline is indicated by A, in the figure.
The Centreline is indicated by B, in the figure.
The Centreline is indicated by C, in the figure.
The Second Officer, when on watch on the bridge, is often referred to as the OOW. What does OOW actually stand for?
Officer on Watch.
Officer of the Watchkeeping.
Officer of the Watch.
What do you call the method used for bone-soft part injuries?
ICE-method.
RICE-method.
ABC-method.
What does the abbreviation ABC mean in first aid?
Alertness, Breathing, Care.
Air, Breathing, Circulation.
Airway, Breathing, Compression.
What is a contingency plan for ships?
Plan for safety preparedness.
Plan for routine maintenance.
Plan for cargo loading sequence.
What is the correct lifting technique?
Back bent, legs straight, using back muscles to lift.
Legs bent, back straight, using leg muscles to lift.
Legs straight, back bent, lifting quickly.
What types of fire extinguishers shall be used in the engine room?
Fire extinguishers equipped for powder or CO2 only.
Water-based fire extinguishers.
Foam fire extinguishers only.
Is it necessary to state the accounting code of the vessel in fully automated radio telex traffic with a coast-station?
Yes.
No.
Only if requested by the coast station.
Give the command after ga+ for the transmission of a ‘store and forward’ – message with radio-telex:
rcv..+
tlx..+
snd..+
To guarantee optimal reception of VHF-DSC-calls, every:
DSC-symbol is sent twice and checked extra by Error Check Character.
DSC-symbol is sent once and accepted without check.
DSC-symbol is sent three times without verification.
When on HF band a DSC distress alert is received, you have to listen to:
The DSC distress frequency on VHF band.
The radio telephony distress frequency in the band in which the DSC distress alert was received.
The general calling frequency on the MF band.
EGC is short for:
Enhanced Group Call.
Emergency General Call.
Electronic Group Communication.
A distress-call received via RCC should:
Always be ignored until further notice.
Only be given receipt, if the master has confirmed that assistance indeed can be given.
Be immediately broadcasted to all ships regardless.
The whip-antenna of the MF transceiver was lost in bad weather. The MF-transceiver can be used again:
If the whip-antenna is replaced by an antenna of about the same length as the original one.
Without any antenna at all.
Only after repair by manufacturer.
A lead battery of 200 Ah, in accordance with the DIN-standard, must be able to supply:
10 ampere during 20 hours.
20 ampere during 10 hours.
5 ampere during 40 hours.
When should voyage planning be done?
After leaving the berth.
Prior to leaving the berth.
During the voyage.
What is important to check when transferring a position from the GPS output to a paper chart?
Any necessary corrections are applied to convert between the GPS datum and the chart datum.
The position matches the last radar fix exactly.
The GPS output is always accurate and no checks are needed.
What are the limits of a passage or voyage plan?
From port to port, excluding berth operations.
From berth to berth.
From the open sea to the pilot station only.
On area A3 the function "Transmission and reception of signals for locating" is mainly based on:
the use of SART transponders.
the use of radar systems.
the use of GPS technology.
Which of the following is the correct minimum carriage requirement for a ship of more than 300 gross tons and operating in area A1:
2 VHF RT + DSC + 1 SART – 1 NAVTEX.
1 VHF RT + 1 SART + 1 EPIRB.
1 VHF RT + DSC + DSC watch receiver – 1 or 2 SART – 1 NAVTEX or 1 EGC receiver – 2 or 3 VHF portable - 1 EPIRB.
Which of the following is a ship MMSI?
123456789.
987654321.
227530000.
Which word will precede a distress message?
MAYDAY.
SOS.
HELP.
How long does it take for a fixed low expansion foam fire-extinguishing system of an engine room to discharge a 15 cm thick layer of foam on the largest single area over which oil fuel is liable to spread?
Less than 5 min.
More than 10 min.
5 to 10 min.
Which of the following statements applies to fire doors in main vertical zone bulkheads and stairway enclosures in passenger ships?
Fire doors must be kept closed at all times.
Fire doors should be inspected regularly.
All the alternatives are correct.
How much water per person is provided in a lifeboat not equipped with a desalting apparatus?
3 litres.
2 litres.
4 litres.
The mandatory color of a hand flare is:
Red.
Green.
Blue.
Buoyant smoke signals shall be so designed as to burn or emit smoke:
For a maximum of 5 seconds after immersion.
Intermittently for 10 seconds after immersion.
Continuously after having been immersed for a period of 10 seconds under 100 mm of water when underwater.
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.
Only lifeboat drills.
Fire drills only.
Which one of the listed items has to be included in a distress message?
Identification of the ship.
The weather conditions.
The name of the captain.
The maximum height that a pilot should be required to climb on a pilot ladder before reaching the deck or stepping onto an accommodation ladder platform is:
6 mtrs.
12 mtrs.
9 mtrs.
What kind of foot wear should be used when working on deck and in the engine room?
Safety shoes or safety boots.
Sandals.
Flip-flops.
Fire protected lifeboats when waterborne should be capable of protecting its full complement when subjected to a continuous oil fire that envelops the boat for a period of not less than how many minutes?
8 minutes.
5 minutes.
10 minutes.
Identify this symbol:
Fire extinguisher.
Lifeboat.
Emergency generator?
Which of the following areas may be possible restricted areas? (Review all answers)
All alternatives.
Engine room.
Cargo hold.
Which of these actions should crew take if a suspicious object that may be a bomb is located during a search?
Confirm with their search partner that the object found is suspicious.
Ignore the object and continue searching.
Attempt to move the object to a safer location.
The compass binnacle on the ship has various specific functions, which of the following answers reflect its most important functions?
To protect the compass from external influences.
To provide illumination for the compass.
All of the answers provided.
The gyro compass can suffer from a compass error and may need to be allowed for, when steering a course in a dangerous navigational area. What is the probable cause of the error?
An uncorrected course and speed error.
Magnetic interference from nearby equipment.
A malfunction in the gyro compass itself.
What is the correct understanding of the term "Isobar"?
An "Isobar" is a line joining places of equal temperature.
An "Isobar" is a line joining places of equal humidity.
An "Isobar" is a line joining places of equal pressure.
What is the direction of wind associated with an anticyclone (area of high pressure) in the Northern Hemisphere?
Clockwise around the high pressure.
Counterclockwise around the high pressure.
No specific direction; it varies.
What action should be taken by the Officer of the Watch in the event of fire being reported to the bridge during the 00.00 to 04.00 watch?
Sound the Fire Alarm.
Investigate the source of the fire.
Wait for confirmation from the crew.
When using the echo sounder in a river the soundings indicated may be incorrect, what would be the most probable cause of the error?
The speed of the vessel.
The angle of the echo sounder.
The density of the water.
A ship moving through heavy seas is affected by the water pressure at the bows causing an effect known as "Panting". What structure in the forward region of the ship combats the effects of Panting?
Panting beams and stringers.
Bulkheads.
Keel plates.
Why are oil free compressors, either reciprocating or screw types, generally preferred for LPG carrier cargo compressors?
It avoids the risk of cross contamination between oil and cargo.
They are more energy efficient.
They require less maintenance.
What type of cargo tanks are normally used for the cargo containment system for fully pressurised and semi-pressurised liquefied gas carriers?
Membrane tanks.
Type A tanks.
Independent Type C.
Which IMO publication deals specifically with the construction and equipment of liquefied gas carriers?
The IGC Code.
The SOLAS Convention.
The MARPOL Convention.
Some of the cargoes carried onboard liquefied gas carriers are classed as saturated hydrocarbons. What are the features of the common saturated hydrocarbon cargoes (e. g. propane and butane) that are carried on these vessels?
As liquids they are colourless, odourless and are chemically non-reactive.
They are highly reactive and flammable.
They have a strong odour and are brightly coloured.
Mollier diagrams are often used onboard liquefied gas carriers in relation to the reliquefaction plant and cargo carriage conditions. What parameters are represented by the main vertical and horizontal axis of the diagram?
Temperature and volume.
Density and temperature.
Absolute pressure and enthalpy.
You are proceeding along a coastal route when you hear this signal. The visibility is severely restricted. What does the signal mean?
There is a vessel aground in the vicinity. She is more than 100 metres in length. She is sounding an additional warning to approaching vessels that they are "running into danger."
There is a fishing vessel in the area.
A navigational hazard is present nearby.
The term ‘Fresh Water Allowance’ can be defined as:
The total weight of fresh water carried onboard.
The amount of fresh water needed for ballast purposes.
The number of millimetres by which a vessel's True Mean Draught changes when she passes from salt water to fresh water, or vice versa.
The term ‘luffing’ means:
The raising or lowering of a crane jib, moving the head of the crane and therefore a suspended load horizontally towards or away from the crane.
The rotation of the crane around its base.
The extension or retraction of the crane boom.
You are approaching the port entrance. What do these lights mean?
A vessel may proceed only when she has received specific orders to do so.
Don't know.
A vessel may enter without any restrictions.
A vessel must wait for further instructions.
What would be the correct method to report to other ships in the vicinity that a person has fallen overboard from your vessel?
Don't know.
"Vessel "name" has lost a person overboard in "position….."
"We have an emergency on board, please assist!"
"A person has fallen overboard, send help!"
What would be the correct method to report to other ships in the vicinity that a person has fallen overboard from your vessel?
Don't know.
"Vessel "name" has lost a person overboard in "position"….."
"We have an emergency on board, please assist!"
"A person has fallen overboard, send help!"
What should be a correct form of response to the question: What is the weather in your position?
The correct form of response would be to give the wind force and direction, the range of visibility and the sea state.
Don't know.
It is sunny and clear.
The weather is fine.
The vast majority of electrical instrumentation and testing equipment used onboard liquefied gas carriers is classes as intrinsically safe. What is the IMO Gas Codes' definition of intrinsically safe equipment?
Equipment which is incapable of releasing sufficient energy, during use or in specified fault condition, to cause ignition of a hazardous atmosphere.
Don't know.
Equipment that can operate in any environment.
Equipment that requires special handling procedures.
What type of construction material should be avoided regarding fire protection purposes? (SOLAS II-2/2.2.3)
Non-combustible materials.
All combustible materials.
Don't know.
Materials treated with fire retardants.
What is the maximum allowed suction head for fire pumps? (SOLAS II-2/4.3.3.2.5)
4,5 meters
Don't know.
3,0 meters.
5,0 meters.
When splicing an eye on a mooring wire (using the recommended 5 full tucks and 2 half tucks) the effective breaking strength of the wire may be affected by the splice. What would be the anticipated change in the breaking strength of the wire?
No change in strength.
A reduction in strength of 10 % to 15 %.
An increase in strength of 5 %.
Don't know.
In the figure, which letter gives the correct understanding of the term "LENGTH OVERALL"?
Length Overall is indicated by B, in the figure
Don't know.
Length Overall is indicated by A, in the figure.
Length Overall is indicated by C, in the figure.
How can a new officer, just boarding a ship, ensure that he knows the location and operation of all navigational and safety equipment and take account of the operating limitations of such equipment?
By reading the equipment manuals only.
By asking other officers and practicing with the use of the equipment.
Don't know.
By observing the equipment without using it.
When is the Officer of the Watch officially relieved of his responsibilities of being in charge of the watch?
When the Master informs the Officer of the Watch that he is taking over the "con" (watch responsibilities).
Don't know.
When the next officer arrives on the bridge.
At the end of the scheduled watch period.
What is SITREP an abbreviation for?
Situation Report.
Don't know.
Special Incident Tracking Report.
Standard Information Transfer Report.
Two ships travelling in opposite directions are to pass each other in a narrow river, as illustrated. Explain what is likely to happen as they pass each other?
Both ships will collide due to the narrowness of the river.
Due to interaction, the bows will repel each other, and then when alongside each other the two ships will be sucked together and finally the sterns will be repelled as they start to pass clear.
Don't know.
The ships will pass each other without any effect.
What is the correct understanding of the term "a ship with good Directional Stability"?
A ship which when the rudder is left amidships, it will continue on approximately a straight course.
Don't know.
A ship that can turn quickly in any direction.
A ship that requires constant rudder adjustments to maintain course.
If your vessel is fitted with wires on self-stowing 'split drum' winches, the advantage of having these split drum winches is:
They require less maintenance.
All the listed alternatives.
Don't know.
They are lighter than traditional winches.
What is the disadvantage of using chemicals on an oil-spill on the water?
The chemicals make it difficult to remove the oil from the water.
Don't know.
The chemicals are more effective than physical removal.
The chemicals can enhance the oil's biodegradation.
At what temperature would a fully refrigerated cargo of propane normally be carried on a liquefied gas carrier?
minus 10 °C.
minus 30 °C.
Don't know.
minus 43 °C.
What will you serve seafarers who have been exposed to heat?
Cold drinks and salt.
Don't know.
Hot drinks and sugar.
Water only.
Treatment of burns and scalds depends on the severity of the injury. What is the correct thing to do for minor burns and scalds?
Place the injured part under slowly running cold water for at least 10 minutes, but preferably until the pain is gone. If no water is available, use any cold, harmless liquid.
Don't know.
Apply ice directly to the burn.
Cover the burn with a thick layer of ointment.
Which VHF channel should be used for intership navigation safety communications?
Ch.16.
Ch.22.
Don't know.
Ch.13.
What does this two flag hoist signal indicate?
I am in distress and require immediate assistance.
Don't know.
I am anchoring.
I am leaving the port.
You are proceeding along a narrow channel and approaching a bend, on the inside shore of which is a large hill, which obscures your view further up channel. What sound signal will you make to indicate your presence to any vessel that is behind the obstructing hill?
One prolonged blast.
Don't know.
Two short blasts.
One short blast.
What is the advantages of a GPS satellite system compared to other navigational aids?
It requires less power to operate.
The GPS system gives information about position, speed and time continuously worldwide.
Don't know.
It is less expensive than other systems.
In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?
Qualified Individual.
Don't know.
The ship's captain.
The local authorities.
Some liquefied gas carriers are fitted with cascade type direct cooling plants to meet cargo vapour reliquefaction requirements. What is the cargo vapour normally condensed against in a cascade type cooling plant?
Sea water.
A commercial refrigerant gas.
Don't know.
Fresh water.
Some liquefied gas carriers are fitted with independent, combustion type, inert gas generators. In addition to maintaining an inert atmosphere in hold and interbarrier spaces, what is the other main purpose of having this type of inert gas plant onboard a liquefied gas carrier?
To prevent flammable mixtures forming in cargo tanks and lines during gassing up and gas freeing operations.
Don't know.
To enhance the cargo loading process.
To improve the efficiency of the refrigeration system.
Independent tanks are used in the cargo containment system of some liquefied gas carriers. Are all independent tanks self-supporting?
No, some require external support.
Yes, all independent tanks are self-supporting.
Don't know.
Only certain types of independent tanks are self-supporting.
Some liquefied gas carriers require a secondary barrier as part of the cargo containment system. What is the main purpose of a secondary barrier on these gas carriers?
To provide temporary containment of any leakage of cargo through the primary barrier.
Don't know.
To enhance the structural integrity of the vessel.
The cargo tank pressure reading for a refrigerated cargo of propane is higher than the saturated vapour pressure for the cargo temperature. e. g. an absolute pressure of 1,5 bar at minus 43 degrees °C. If the cargo tank had been cleaned before loading the cargo what is the likely cause of this condition?
Don't know.
The cargo was overfilled during loading.
Some inert gas or nitrogen remained in the tank after gassing up.
What is normally meant when a cargo tank on a liquefied gas carrier is said to be in a gas free condition according to the IMO Gas Codes?
Don't know.
The tank atmosphere has first been inerted and then fully aerated and contains only fresh air.
The tank is filled with a non-flammable gas.
Cargo compressors are often used to handle cargo vapour on LPG carriers. How is liquid cargo prevented from entering the suction side of the cargo compressor?
Don't know.
By fitting a liquid separator in the vapour line between the cargo tank and the compressor.
By using a pressure relief valve on the cargo tank.
Some liquefied gas cargoes are classed as unsaturated hydrocarbons. What general characteristics of unsaturated hydrocarbon cargoes distinguish them from saturated hydrocarbon cargoes?
Don't know.
Unsaturated hydrocarbons usually have a sweetish odour and they are more chemically reactive than saturated hydrocarbons.
They have a higher boiling point than saturated hydrocarbons.
Some LPG carriers are designed with semi-membrane tanks. How would LPG normally be carried in semi-membrane tanks?
The LPG would be fully refrigerated.
The LPG would be carried at ambient temperature.
The LPG would be carried in a gaseous state.
What is "LENGTH OVERALL", in the figure?
Length overall is indicated by A.
Length overall is the total height of the vessel.
Length overall is indicated by B, in the figure.
What is a contingency plan for ships?
Plan for safety preparedness.
Plan for regular maintenance.
Plan for crew training.
How many buoyant smoke signals are carried in each lifeboat?
4.
1.
2
The compulsory testing of a prescribed EPIRB is to be done:
Once a month.
Once a year.
Every six months.
The traffic list of a coast-station is a list of:
Call-signs of ships for which a radio-telephone call, a telegram or another call is intended.
The schedule of ship arrivals and departures.
The list of emergency contacts.
At the end of a radio telex-connection, when a ‘store and forward’ message has been transmitted, the coast-station at least gives a:
Confirmation of message receipt.
A summary of the message content.
Time (in UTC) whereupon the telex for the subscriber is delivered.
With an Inmarsat-C terminal the option ‘PSTN’ for addressing is available. This option:
Is to deliver a message by telephone via a modem on the computer of the subscriber.
Is used for direct satellite communication.
Allows sending messages only to other Inmarsat terminals.
On board an accident happened. Urgent radio-medical advice is needed. We choose the category:
Urgency.
Safety.
Routine.
You wish to send a DSC-message because of a m.o.b. situation and assistance by other ships is required. You have to choose the category:
Urgency.
Distress.
Safety.
“RECEIVED MAYDAY” is used in a:
Receipt of a distress alert.
Confirmation of a routine message.
Acknowledgment of a safety message.
A DSC distress alert is received. The message states that communication by radiotelex is preferred. One preferably uses:
Both FEC and ARQ modes.
FEC mode ARQ mode.
ARQ mode.
Testing a SART is permitted:
At sea, outside territorial waters, and in port or harbour.
Only in port.
Only at sea, away from other vessels.
At the entrance to the space where batteries are stored on board the following notice must be fitted:
Authorized personnel only.
No entry with naked light and/or flame.
Wear protective equipment.
When navigating using the GPS, how does the GPS display indicate when the accuracy of the displayed position is reduced?
A large HDOP value is displayed on the screen.
A warning sound is emitted.
The screen flashes red.
What methods could be introduced into a passage plan for continuous monitoring of the ship's position when navigating along a coastline?
Visual landmarks only.
Radar range circles.
Parallel Index lines.
Where can a ship expect an act of piracy to take place?
All over the world.
Only in specific high-risk areas.
In coastal waters only.
For how long time should a SARSAT COSPAS EPIRB be able to operate on its batteries?
24 hours.
48 hours.
72 hours.
What is the required number of hours that a SART's battery must be able to operate the unit in the standby mode?
Four (4) days.
Two (2) days.
One (1) day.
In which publication will you find the working frequencies of coast stations?
The Maritime Safety Information (MSI) publication.
The International Maritime Organization (IMO) guidelines.
The ITU List of coast stations.
A flame detector is activated by:
The infrared radiation and ultraviolet radiation given off by flames.
The heat produced by the flame.
The visible light emitted by the flame.
Among working conditions listed below which one is required for every propulsion engine of lifeboats?
Engine must run for at least 30 minutes without interruption.
Starting achieved within 2 min of commencing the start procedure at an ambient temperature of -15 °C.
Fuel consumption must not exceed 5 liters per hour.
The mandatory color of a hand flare is:
Red.
Green.
Blue.
How much liferaft capacity should be provided on a conventional cargo ship of more than 85 meters in length?
50 % of the complement on one side only.
100 % of the complement if it can be readily launched on either side of the ship. If it cannot be readily launched on either side, 100 % must be provided on each side.
75 % of the complement on each side.
What is the period of validity of the Safety Management Certificate?
5 years.
3 years.
7 years.
Under ISM, what is a "non-conformity"?
A situation that meets all specified requirements.
A temporary deviation from the safety management system.
An observed situation where objective evidence indicates the non-fulfilment of a specified requirement.
What is the purpose of explosimeters?
Measure the amount of explosive gases in % of LEL.
Detect the presence of toxic gases.
Measure temperature and humidity levels.
What colour flare is used to signal a safe landing place for small boats?
Red.
Blue.
Green.
Having a CO2 alarm during normal working hours, what immediate action should be taken?
Get out of the engine room as soon as possible.
Investigate the source of the alarm.
Silence the alarm and continue working.
An alarm signal consisting of seven short blasts followed by one long blast is sounded by the ship's whistle and the alarm bells. What are you to do?
Remain at your current location.
Wait for further instructions from the captain.
Go to your lifeboat station (muster station).
When is a visitor onboard required to present an ID?
"On SECURITY Level 1, 2 & 3".
Only during emergency drills.
When entering the engine room.
Ship Security Plans all look the same.
Only the cover pages are different.
TRUE.
FALSE.
What could be the reason for the magnetic compass to swing through large angles when the ship is rolling in a seaway?
The heeling error magnets are upside down and/or not in the correct position.
The compass is not calibrated properly.
There is interference from electronic equipment.
Is the location of the Compass Binnacle critical?
Don't know.
No, it doesn't matter.
Maybe, depending on the situation.
Yes, for the reasons stated in all of the suggested answers.
A ship is navigating in the Caribbean in August when it receives the warning of a Hurricane. To determine the centre of the storm the Master uses "Buys Ballot's Law" and faces the wind. On what side of the Master would the low pressure area be located?
Don't know.
On the left side.
On the right side.
Behind the Master.
What is the weather associated with being in the centre of an Anticyclone (a region of High Pressure)?
Don't know.
Stormy weather and heavy rain.
Light winds and fair weather, sometimes fog.
Overcast skies with occasional thunderstorms.
What actions should the Officer of the Watch take when the ship's steering gear fails?
All of the suggested answers.
Don't know.
Check the emergency steering system.
Notify the captain.
What immediate actions should the Officer of the Watch take when the ship goes aground on an uncharted shoal in the middle of the ocean?
Assess the damage to the hull.
Stop engines and call the Master.
Send a distress signal.
Don't know.
When using the echo sounder in a river the soundings indicated may be incorrect, what would be the most probable cause of the error?
The density of the water.
Don't know.
The speed of the current.
The temperature of the water.
The position of the ship is found by taking a series of bearings using a magnetic compass. How should an error of 5 degrees WEST be applied to the compass bearings?
Add 5 degrees to the bearings.
Ignore the error.
Subtract 5 degrees to the bearings.
Don't know.
What are the ideal conditions required to satisfactorily conduct an Inclining Experiment?
All of the suggested answers.
Don't know.
Calm weather conditions.
A stable vessel.
How can an approximate value of the initial transverse Metacentric Height (GM) be found from the Curve of Statical Stability (GZ curve)?
Measuring the area under the curve.
Drawing a tangent to the curve through the origin and erecting a perpendicular through the angle of heel of 57,3 degrees.
Don't know.
Calculating the center of gravity.
LPG carriers often have a booster pump in the cargo system. What is the main purpose of the booster pump on an LPG carrier?
The main purpose of booster pump is to increase discharge pressure normally available from the cargo pump.
Don't know.
To reduce the temperature of the cargo.
To facilitate loading operations.
Why are oil free compressors, either reciprocating or screw types, generally preferred for LPG carrier cargo compressors?
They require less maintenance.
It avoids the risk of cross contamination between oil and cargo.
They are more energy efficient.
Don't know.
Gassing up is one of the operations that may be required before loading a cargo of LPG. What is the main reason for gassing up cargo tanks on refrigerated LPG carriers before loading the cargo?
To remove the inert gas, which may contain incondensable elements, from cargo tanks.
Don't know.
To cool down the cargo tanks.
To increase the pressure in the tanks.
Why is drying of the cargo handling system necessary on fully refrigerated LPG carriers before loading cargo?
To reduce the weight of the cargo.
To avoid the risk of ice and hydrate formation in the cargo system.
Don't know.
To improve the efficiency of the pumps.
The cargo tanks for liquefied gas carriers are grouped into 4 types depending on the survival capability requirements. Which of tank types is suited for the carriage of all cargoes listed in chapter 19 of the IMO IGC Code from a survival capability aspect?
1 G.
Don't know.
2 G.
3 G.
Liquefied gas cargo carriage conditions vary depending on the cargo containment system being used. What would normally be the cargo carriage condition for liquefied gas cargoes carried in membrane type tanks?
Pressurized at high temperature.
Fully refrigerated and approximately atmospheric pressure.
Don't know.
Fully vaporized and under vacuum.
You are proceeding along a coastal route when you hear this signal. The visibility is severely restricted. What does the signal mean?
There is a vessel aground in the vicinity. She is more than 100 metres in length. She is sounding an additional warning to approaching vessels that they are "running into danger".
Don't know.
A fishing vessel is operating in the area.
There is a navigational hazard nearby.
The term ‘Fresh Water Allowance’ can be defined as:
The amount of fresh water a vessel can carry.
The number of millimetres by which a vessel's True Mean Draught changes when she passes from salt water to fresh water, or vice versa.
Don't know.
The difference in density between fresh and salt water.
What does this signal hoist mean?
I require immediate assistance.
Don't know.
I am in a safe position.
I am requesting a pilot.
Which is the correct term given to the company providing stores and provisions to a ship in port?
The port agent.
The ship chandler.
Don't know.
The ship supplier.
What do you understand by the initials: EPIRB?
This means: Emergency Position Indicating Radio Beacon.
Don't know.
This means: Emergency Protocol Information Radio Beacon.
This means: Emergency Position Indicator Radio Base.
The superstructure and deck houses of passenger ships carrying more than 36 passengers shall be divided into main vertical zones by...
Class "A" division.
Don't know.
Class "B" division.
Class "C" division.
The purpose of remotely controlled measuring of tank levels are to measure:
Height of liquid in the tank.
Temperature of cargo pumps.
Density of ballast water.
Pressure in the cargo lines.
One of the following is NOT an alarm on an inert gas plant ,which one -
Low oxygen alarm.
High oxygen alarm.
Low water seal pressure alarm.
High gas temperature alarm.
While commencement of loading cargo direct high pressure loading is advisable.
False.
True.
Only when cargo is non-hazardous.
Only if shore approval is obtained.
If centrifugal pump operating with a positive suction head becomes air bound , your FIRST response should be to...
Vent the casing.
Increase pump discharge pressure immediately.
Stop the pump and open the discharge valve fully.
Close the suction valve completely and restart the pump.
How much cleaner is Natural Gas to Burn?
Reducing carbon dioxide (CO2) emission by 20 % to 30 %.
Reducing carbon dioxide (CO2) emission by 5 % to 10 %.
Increasing carbon dioxide (CO2) emission by 20 % to 30 %.
Producing no carbon dioxide (CO2) at all.
Self contained Breathing apparatus – SCBA is also called as...
Compressed air breathing apparatus - CABA.
Oxygen rebreather unit.
Emergency escape filter mask.
Portable gas detection set.
The space enclosed by the ship structure is which a cargo continment system is situated called...
Hold space.
Ballast tank.
Cofferdam space.
Double bottom space.
This liquefied gas is normally carried in its fully refrigerated condition at its atmospheric boiling of -104 degree C is...
Ethylene.
Propane.
Ammonia.
Butane.
How is cooling water supplied to the inert gas scrubber tower?
By the scrubber sea water pump.
By the ballast pump.
By the cargo oil pump.
By the fire main emergency pump.
Which safety device is fitted on the deck inert gas line to monitor the supply condition of the inert gas?
The inert gas low pressure alarm.
The oxygen analyser.
The cargo tank temperature sensor.
The flame arrester.
Tank relief v/v used for release of excessive pressure.
True.
False.
Only when the tank is empty.
Only during tank cleaning operations.
What characteristics should insulation material possess for use in gas carrier?
Low thermal conductivity , ability to bear loads, ability to withstand mechanical damages , lightweight, unaffected by cargo liquid or vapour.
High thermal conductivity, high density, and ability to absorb moisture.
Heavyweight construction with low resistance to mechanical damage.
Ability to dissolve in cargo vapour and expand under load.
Which of the following is the ultimate source of energy for us...
Solar.
Nuclear.
Geothermal.
Tidal.
Why strainers are commonly installed in the cargo piping system?
To protect the cargo.
To increase cargo temperature.
To reduce tank capacity.
To measure cargo density.
Which of these you consider essential equipment to carry when working on the deck of ship carrying ammonia?
Gas mask.
Binoculars.
Sounding tape.
Portable spotlight.
What is the condition of the inert gas as it is produced by the boilers or inert gas generator?
Free of oxygen and clean.
Hot, contaminated, and containing combustion products.
Fully dried and enriched with oxygen.
Cold, compressed, and free of moisture.
For what reason cargo sampling is necessary in gas tanker?
To establish safe condition prior to cargo transfer and to establish that the cargo is within commercially agreed specifications.
To determine the vessel\'s fuel consumption during the voyage.
To calculate the ship\'s freeboard before departure.
To verify the condition of the cargo tank coating only.
What is the MAIN danger to be guarded against when discharging using a cargo heater with seawater as the heating medium?
Freezing of the water side of the heater.
Overheating of the ship’s main engine.
Excessive oxygen content in the cargo tanks.
Corrosion of the cargo manifold due to sunlight exposure.
Magnesium, titanium, sodium, lithium and potassium are classified as...
Class D fire.
Class A fire.
Class B fire.
Class C fire.
What are the symptoms of Asphyxiant, when LPG and LNG carried as cargo?
Increased rate and depth of respiration & loss of consciousness , Blueness of the skin , stertorous breathing with a snoring sound.
Increased appetite, improved vision, and elevated body temperature.
Severe skin rash, itching, and excessive sweating only.
Sharp abdominal pain, toothache, and muscle cramps only.
Inert gas – how is sea water supplied to the deck seal?
Through the deck seal pump fitted in the engine room.
Through the ballast pump connected to the cargo tanks.
By gravity feed from the fresh water tanks.
Through the fire main using the emergency fire pump only.
On tank vessels, which of these valve types is most commonly used in conjunction with hydraulically actuated controls?
Butterfly valves.
Globe valves.
Needle valves.
Foot valves.
What is critical temperature of methane in degree Celsius?
(- 82,5).
(-42,0 °C).
(-161,5 °C).
(-25,0 °C).
On tank vessels equipped with the power operated cargo tank valves , the types of power operator most commonly used is...
Hydraulic.
Pneumatic.
Electric.
Manual mechanical.
The valve best suited for throttling gas or liquid flow in pipeline is the...
Globe valve.
Gate valve.
Butterfly valve.
Check valve.
What is the boiling point at atmospheric pressure of Ammonia?
(- 34 °C).
(-104 °C).
(-162 °C).
(-10 °C).
What tanks are completely self supporting and do not form part of the ships hull structure?
Independent tanks.
Membrane tanks.
Integral tanks.
Double-bottom tanks.
Ammonia forms explosive compounds with...
mercury , chlorine, iodine, bromine, calcium silver oxide and silver hypochlorite.
copper, zinc, magnesium and aluminium oxides.
nitrogen, argon, helium and carbon dioxide.
sodium chloride, potassium chloride and calcium carbonate.
Mole hydrogen is...
2.
1.
16.
32.
What should your first action be on seeing someone have an accident with spillage of liquefied gas...
Sound the emergency alarm.
Attempt to move the casualty immediately.
Start cargo operations to disperse the gas.
Enter the affected area and investigate the leak source.
A centrifugal pump should always be started against a closed or partially open discharge valve. What is the reason for this...
To minimize the pump motor load.
To increase the pump suction pressure.
To prevent the pump from drawing air into the system.
To maximize the flow rate immediately after start-up.
If the containment pressure of LPG increase the boiling point will...
Increase.
Decrease.
Remain unchanged.
Fall to atmospheric boiling temperature.
Which of these cargoes would you be allowed to carry in type 3G (as defined by the IMO gas code) ship.
Liquid Nitrogen.
Liquid Chlorine.
Vinyl Chloride Monomer (VCM).
Ethylene Oxide.
You are discharging cargo of propane and the cargo tank pressure are falling quickly. What would you do to maintain a steady tank pressure?
Request that vapour is supplied from shore.
Increase the cargo discharge rate significantly.
Open the tank vent mast to atmosphere.
Start cooling the cargo tanks with additional spray.
Pressure gauges on gas tanker are marked in absolute pressure or gauge pressure. Which of these refers to absolute pressure?
kPaA.
kPaG.
barg.
psig.
What is the MAIN danger to be guarded against when discharging using a cargo heater with seawater as the heating medium?
Freezing of the water side of the heater.
Overheating of the cargo due to excessive seawater temperature.
Corrosion of the cargo tanks caused by seawater vapour.
Excessive cargo tank pressure caused by seawater circulation.
What is meant when a liquid gas cargo is described as flammable?
The vapour from the cargo will burn when mixed with air and ignited.
The liquid cargo will spontaneously ignite at ambient temperature.
The cargo will explode without any external ignition source.
The cargo cannot be safely transported in bulk.
Who is responsible for keeping certificates such as the Cargo Ship Safety Construction certificate and Cargo Ship Safety Radio certificate up update?
The Master.
The Ship’s Cook.
The Cargo Surveyor.
The Classification Society only.
If the cargo density is different from that specified by the float gauge manufacturer which of these correction will compensate for this?
Float correction.
Temperature correction.
Pressure correction.
Ullage correction.
Which of these cargo would NOT need TOTAL segregation when carried in separate tanks on the same ship?
Propane and Butane.
Ammonia and Chlorine.
Ethylene oxide and Propylene oxide (with different hazards).
Vinyl chloride monomer and Oxygen.
On an LNG tanker why would you carry out cargo tank spraying operations?
To cool the tank ready for loading.
To warm the cargo tank before discharge.
To remove inert gas from the tank atmosphere.
To increase cargo tank pressure for pumping operations.
Operational which of these would you NOT use on gas pool fire?
Water.
Dry chemical powder.
Foam.
Carbon dioxide (CO2).
Setters can be changed on pilot operated relief valves to increase the lifting pressure as long as this does not exceed the MARVS what does MARVS stand for?
Maximum Allowable Relief Valve Setting.
Maximum Automatic Release Valve System.
Minimum Allowable Relief Valve Setting.
Main Air Release Valve Standard.
If a gas is carried in a pressurized state how will this affect the temperature at which it is carried?
Can be carried warmer.
Must be carried at its normal boiling point only.
Must be carried at very low (cryogenic) temperature.
Temperature has no effect on pressurized gas storage.
If you changed the set point of relief valve where would you make a record of the change?
Ships log.
Oil Record Book.
Cargo manifest.
Engine room bell book.
Why would an inhibitor be added to a liquefied gas cargo?
To stabilise an unstable or reactive product.
To increase the vapour pressure of the cargo.
To reduce the density of the liquid for easier pumping.
To neutralise seawater contamination in cargo tanks.
Why is glycol added to the cooling water system of reliquefaction plant?
To stop the water freezing.
To increase the cooling capacity of seawater.
To raise the boiling point of the refrigerant gas.
To prevent corrosion in cargo tanks.
You are gas freezing a tank LNG using a combustion type inert gas generator. After blowing through with air, for which of these would you not need to test?
Hydrogen sulphide.
Oxygen content.
Hydrocarbon vapours.
Carbon monoxide.
A cargo tank has been gas freed from LNG and you wish to inspect it. From where would you take sample to test for hydrocarbons?
The top , bottom and levels in between.
Only from the tank bottom.
Only from the tank top ullage space.
Only from the pump suction level.
Which of these is not a hydrocarbon gas?
Sulphur dioxide.
Methane.
Ethane.
Propane.
On all gas ship any pipework entering or leaving the cargo tank must do so through the...
Top of the tank.
Bottom of the tank.
Side shell of the ship.
Double bottom space.
One of the main parameters to be considered in tank design for refrigerated gas cargoes is...
Thermal stress.
Cargo colour change.
Electrical resistance of cargo liquid.
Tank wall magnetic permeability.
What do you understand by the term ESD system?
Emergency shut down system.
Emergency supply distribution system.
Engine safety detection system.
Exhaust smoke dilution system.
What type of cargo would you normally carry in ship fitted with independent type B tanks?
LNG.
Crude oil.
Dry bulk cargo.
Containerised cargo.
Colourless and odourless gases are stenched to assist in their...
Detection.
Liquefaction.
Compression.
Neutralisation.
On which type of cargo tank would you find a bi-metallic joint or STJ (special transition joint)?
Kvaerner Moss type B.
Membrane type.
Type C independent tank.
Type A prismatic tank.
There are various IMO gas carrier code. What determines which code the ship must comply with?
The years of construction.
The flag state of the vessel.
The type of cargo carried only.
The ship’s deadweight tonnage.
Where would you look to find the properties and hazards of gas carried on your ship?
ICS cargo data sheet.
Ship’s logbook.
Engine room log.
Ballast water management plan.
In a gas tanker what should be your first action on heating the emergency alarm?
Go to your emergency station.
Continue cargo operations until instructed otherwise.
Start cargo pumps immediately.
Open all tank vents.
How would you identify roll over in a full or part full cargo tank?
Rapid rice in pressure.
Gradual decrease in cargo temperature.
Increase in pump discharge rate.
Steady reduction in tank level.
What is the lower flammability limit of butane in % volume hydrocarbon of propane in air?
2,2.
1,0.
5,0
10,0.
Deep well pump shaft bearing are cooled and lubricated by liquid...
Cargo being pumped.
Seawater from ballast system.
Hydraulic oil from deck system.
Inert gas from cargo tanks.
The study of behaviour of matter at low temperature is called...
Cryogenics.
Thermodynamics.
Hydrodynamics.
Metallurgy.
Fixed gas detection system alarm should be activated when the vapour concentration reaches...
5.
1.
10.
20.
A device fitted in gas vent pipeline to arrest the passage of flame into enclosed space is called...
Flame arrestor.
Pressure regulator.
Relief valve.
Gas scrubber.
Chemical combination of flammable substance with oxygen is called...
Combustion.
Evaporation.
Condensation.
Polymerisation.
In an LNG carrier mixture of methane and air are avoided at all time. What is reason?
Risk of fire or explosion.
Risk of cargo freezing.
Risk of cargo contamination only.
Risk of pump cavitation.
Which cargo operation are to be recorded in cargo record book?
All cargo operation.
Only loading operations.
Only discharging operations.
Only emergency cargo operations.
When cargo carried as liquid in cargo tank and not shipped in drums, containers, or packages what are they called as...
Bulk cargo.
General cargo.
Breakbulk cargo.
Packaged cargo.
Gas ship accommodation and machinery space are...
Gas safe.
Gas dangerous areas.
Cargo spaces only.
Inerted spaces.
What is the hazards – reactivity when cargo reacts with water called...
Hydrate formation.
Polymerisation.
Thermal cracking.
Combustion.
Fire fighting technique with a pool fire is to sweep...
Side to side and front to back.
Only from top downward.
In a circular motion only.
Directly into the centre of the fire only.
The mass of vapour compared with the mass of an equal volume of air both at standard condition of temp and pressure is...
Relative vapour density.
Vapour pressure.
Absolute density.
Specific heat capacity.
All account accommodation ventilation system should be stopped or operation on closed cycle if there is possibility of cargo vapour being drawn into accommodation spaces.
True.
False, ventilation should be increased.
Only engine room ventilation should be stopped.
Only cargo ventilation should be stopped.
The term “overall damage” included both safety hazards and pollution hazard.
True.
False, it only refers to structural damage.
False, it only refers to cargo contamination.
False, it only refers to fire hazards.
Removal of liquid from the cargo tank may cause change in inter barrier space pressure and these should be...
Monitored throughout the discharge..
Ignored once discharge starts.
Ventilated continuously to atmosphere.
Fully isolated during cargo operations.
Changing of cargo which may involve...
Only gas freeing, only inerting.
Only inerting.
Both gas freeing and inerting.
Only heating of cargo tanks.
The frequency of pressure testing ashore of BA set should at least every...
5 years.
1 year.
10 years.
6 months.
What is the guiding rule for limiting pressure surge on loading or discharging?
Stop the cargo pump, first close ESD valve nearest to the pump, finally cloase other ESD valves.
Close all ESD valves simultaneously before stopping the cargo pump.
Increase pump speed before shutting any valves to maintain flow.
Open all tank vents fully to relieve pressure surge.
The ventilation of the airlock should be of the pressure type...
Positive.
Negative.
Neutral (atmospheric).
Vacuum type.
Why is it necessary to cool down cargo tank during bulk loading?
To avoid excessive tank pressure.
To increase cargo evaporation rate for faster loading.
To reduce cargo density for measurement accuracy.
To eliminate the need for inert gas use.
An overdose of toxic petroleum vapour effect your sense of smell by...
Taking it away completely.
Increasing sensitivity to all odours.
Turning odours into a sweet smell.
Causing immediate hearing loss instead of smell loss.
All liquified gases produce vapours which have a relative vapour density greater than that of...
Methane.
Helium.
Hydrogen.
Oxygen.
Gas code and classification society rules requires every tank to be...
Fitted with at least two level gauges.
Opened to atmosphere for level checking.
Pressurised continuously during service.
Filled completely at all times.
The concentration of a hydrocarbon gas is air below which there is insufficient hydrocarbon is called...
Lower flammable limit.
Upper flammable limit.
Auto ignition temperature.
Flash point.
What is the critical parameter to be observed for the supply of dry air to cargo tanks for aerating operation?
Due point of dry air supply.
Oxygen content only.
Nitrogen purity only.
Air temperature only.
Oxygen reduction is particularly likely in cargo tanks where...
the tanks have been empty for a long period of time.
The tanks are fully loaded with cargo.
The tanks are continuously pressurised with inert gas only.
The tanks are fitted with heating coils in operation.
LPG, LNG, other gases and electrical are classified as...
Class B fire.
Class A fire.
Class C fire.
Class D fire.
What should cargo sample lockers be constructed of?
Fully resistant material.
Wooden panels with insulation.
Ordinary mild steel only.
Plastic containers without lining.
Removal of liquid from the cargo tank may cause change inter barrier space pressure and these should be...
Monitored throughout the discharge.
Ignored once discharge has started.
Kept fully open to atmosphere at all times.
Permanently sealed during cargo operations.
Earthing and bonding minimize the dangers arising from...
Accumulation of electrostatic charges.
Increase in cargo temperature.
Formation of toxic vapours.
Overpressurisation of cargo tanks.
Which one of these hazards does not apply to methane?
Danger of toxicity (i. e. poisoning).
Flammability in air.
Risk of asphyxiation in confined spaces.
Formation of explosive mixtures with air.
Which of the following fuels is expected to leave a residue upon burning?
Coal.
Methane.
Hydrogen.
Propane.
A process which is accompanied by the absorption of heat called...
Endothermic.
Exothermic.
Isothermal.
Adiabatic.
What protective devices are fitted to the seawater supply to the deck seal, ensuring an effective water barrier in the deck seal and preventing gas back flow in the engine room?
High water level/ overflow alarm , high deck seal temperature, low deck seal , low deck seal pressure.
Low oxygen alarm, high cargo pressure alarm, fire detection system.
Cargo tank level alarm, pump overload protection, gas detector only.
Inert gas generator alarm, compressor trip, ESD activation only.
Which of these valve will be cycled from fully open to fully close when the handle is turned 90 degree?
Butterfly valve.
Globe valve.
Gate valve.
Needle valve.
Liquefied gas spilled on the deck can cause the deck to...
Crack or fracture.
Increase in paint adhesion.
Improve steel flexibility.
Reduce corrosion rate immediately to zero.
Overdose of toxic petroleum vapors affect your sense of smell by...
Reducing it temporarily.
Improving it significantly.
Causing permanent blindness immediately.
Increasing sensitivity to all vapours.
A pump used to increase the discharge pressure from another pump called...
Booster pump.
Bilge pump.
Stripping pump.
Ballast pump.
What are the drawback of using a centrifugal pump as the main cargo pump?
Difficulty of constructing a pump with a high differential pressure per stage, efficiency with a limited field , normally noy being self priming, backflow through the pump when it its stopped difficulty of pumping high viscosity liquids.
High maintenance costs due to excessive moving parts and complex valve arrangements only.
Inability to pump any liquefied gas cargo under pressure.
Requirement for continuous manual operation throughout cargo transfer.
Which specific element plays a vital role in organic chemistry?
Carbon.
Oxygen.
Nitrogen.
Sulfur.
What is meant when a liquid gas cargo is described as flammable?
The vapors from the cargo will burn when mixed with air and ignited.
The cargo will automatically freeze when exposed to air.
The cargo cannot react with oxygen under any conditions.
The vapors from the cargo are incapable of supporting combustion.
Prior to any cargo operation what test need to be carried out?
A full function test of all the equipment and system to be used.
A pressure test of all cargo tanks at maximum working pressure.
A calibration test of the ship\'s magnetic compass only.
A structural load test of the cargo manifold and pipelines.
Toxicity is the ability of substance to harm living tissues quoted in term of threshold limiting value.
True.
False.
Only for flammable substances.
Only when the substance is in liquid form.
What is the maximum oxygen content in tank atmosphere for checking flammable vapor with a combustible gas indicator?
8 % to 10 % O2.
2 % to 4 % O2.
12 % to 14 % O2.
18 % to 20 % O2.
A centrifugal pump should always be started against a closed or partially open valve in order to...
Minimize the starting load.
Increase the pump discharge temperature.
Maximize the flow rate immediately.
Prevent the pump from becoming self-priming.
On an LNG taker why would you carry out cargo tank spraying operation?
To cool the tank ready for loading.
To remove water from the cargo tanks.
To increase the cargo tank pressure before discharge.
To inspect the tank coating for damage.
If at sea the inert gas low pressure alarm is activated it may be necessary to conduct?
Inert gas topping up operations.
Emergency cargo discharge operations.
Ballast water exchange operations.
Tank washing operations.
Which of these is not a hydrocarbon gas?
Sulphur dioxide.
Methane.
Propane.
Butane.
If a cargo is of low flash point it is said to be?
Flammable.
Non-reactive.
Non-toxic.
Inert.
Why is natural gas required to convert into liquified gas?
environmental friendliness, easy to transport, the world has enormous quantities of natural gas but much of its located in areas far from where the gas is needed.
To increase its chemical toxicity for industrial use.
To make it heavier than air for easier combustion control.
To convert it into a solid fuel for long-term storage.
What does EX p represents?
Pressurized.
Purged.
Passive.
Pumped.
What types pf ships are most suitable for the shipment of smaller size cargoes of LPG and chemical gases on short sea and near sea routes?
Fully pressurized ship, semi refrigerated/semi pressurized ship, semi – pressurized/fully refrigerated ship.
Semi-refrigerated/semi-pressurized ship.
Semi-pressurized/fully refrigerated ship.
All of the above.
What is the critical temperature of propane in degrees Celsius?
98,8 °C.
32,1 °C.
-42,1 °C.
150,0 °C.
How is boil-off gas getting generated?
Evaporation, heat ingress , drop in pressure.
Chemical decomposition of inert gas.
Compression of liquefied cargo under pumping.
Reaction between cargo and tank coating.
Emergency means of lightning is provided when there is a blackout?
Both emergency generator and emergency batteries.
Only main generator supply.
Shore power connection.
Cargo pump drive system.
The heat used in evaporation is called...
Latent heat.
Specific heat.
Sensible heat.
Radiant heat.
The unit of measurement of gas is...
Mole.
Newton.
Pascal.
Watt.
What is the ideal location for a cargo tank from the shell planting, in any gas tanker type?
Less than 760 mm from shell planting.
More than 2 000 mm from shell plating.
Directly in contact with the shell plating.
At least 5 meters from shell plating.
When the seller and buyer agree to Free On Board (FOB) what does the buyer pay?
Buyer pays fright , insurance, unloading costs and end transportation.
Buyer pays only the loading costs at the port of shipment.
Seller pays all costs including freight and insurance to destination.
Buyer pays only customs duties at the destination port.
In the cargo tank of a Moss type LNG cargo tank, where are the pumps, pipe work and cabling secured?
Tubular tower inside the cargo tank.
External deck-mounted manifold system.
Double hull ballast space.
Insulation void between hull and tank.
Which code will you refer to for the requirement LNG containment system?
IGC Code.
SOLAS Chapter II-1.
MARPOL Annex - VI.
ISM Code.
The pressure that occurs above a vacuum is called as...
Absolute pressure.
Gauge pressure.
Atmospheric pressure.
Differential pressure.
What is the ideal location for the cargo tank from the bottom shell planting, for any gas tanker type?
B/15 or 2 meters whichever is less.
B/5 or 5 meters whichever is greater.
B/10 or 1 meter whichever is more.
Directly on the bottom shell plating.
Onboard an LNG tanker, what is the option available when gas burning operation is not possible to control the cargo tank pressure?
Heat the boil-off gas and vent to atmosphere via common mast riser.
Increase cargo pumping rate to reduce tank pressure.
Inject inert gas into cargo tanks to stabilize pressure.
Stop all cargo operations and isolate tanks completely.
Which of the following machinery is used for the initial pressurization of insulation spaces?
Nitrogen generator.
Air compressor.
Cargo pump.
Refrigeration compressor.
Onboard an LNG carrier, during loading operations, what will happen when a tank cargo level hits 99 % by volume capacity?
Very high level alarm initiated and ESOS is activated.
Only a low-level alarm is triggered for monitoring purposes.
Cargo pumps automatically increase discharge rate.
Inert gas is automatically injected into the tank.
Your vessel has completed loading and is ready for gauging. Which of the following should you ensure?
All cargo system on the ship should be closed and the shore connection isolated or disconnected.
Cargo pumps should remain running at minimum speed.
Tank inerting should be stopped and vents fully opened.
Shore valves should remain fully open for pressure equalization.
What will happen if cold LNG boil-off gas vented through the mast riser?
A big white plume will be produced.
The gas will immediately ignite due to auto-ignition.
The tank pressure will become negative.
The cargo will instantly liquefy again in the atmosphere.
Onboard a membrane class LNG during purging cargo tanks with LNG when should the vaporizer be shut down?
After it has warned to the ambient temperature.
Immediately after starting purging operations.
When tank pressure reaches maximum allowable working pressure.
Only after inert gas concentration reaches 100 % in the tank.
A gas has to be cooled below its critical temperature to be liquefied?
True.
False.
Only under high vacuum conditions.
Only if pressure is constant at atmospheric level.
During the dilution method of gas replacement, where does the concentration of existing gas drop faster?
Tank inlet.
Tank outlet.
Tank bottom only.
Uniformly throughout the tank.
During heat transfer from one body to another, what transfer takes place?
Energy.
Mass.
Momentum.
Volume.
What is the IGC Code definition for a liquefied gas?
Product having a saturated vapour pressure of 2,8 bar absolute at 37,8 °C (100 °F).
Product that is solid at ambient temperature and pressure.
Any hydrocarbon mixture with flash point above 60 °C.
Gas that cannot be liquefied under any pressure conditions.
How can gas be liquefied?
By the application of pressure or by cooling.
By increasing its temperature only.
By mixing it with inert gas.
By reducing its density through expansion.
What does the pressurizing of insulation with nitrogen and maintaining a slightly higher pressure than the atmospheric pressure prevent?
Formation of explosive mixture ingress of moisture and air.
Increase of cargo temperature during loading.
Over-pressurization of cargo tanks.
Boil-off gas generation inside cargo tanks.
What is the consequence of ice formation in a cargo tank?
Possible damage to the cargo pump during discharging.
Increase in cargo vapor pressure leading to spontaneous ignition.
Complete neutralization of cargo toxicity.
Conversion of LNG into inert gas mixture.
Why is LNG liquefied for sea transportation?
It makes it more economical to transport.
It increases the energy content of the gas.
It eliminates the need for insulation on cargo tanks.
It converts methane into a non-flammable liquid.
Up to what temperature is methane vapour heavier than air?
−110,5 °C.
−161,5 °C.
−42,1 °C.
−82,5 °C.
In case of heating the mercury column containing the test liquid, the level of mercury will...
Decrease.
Increase.
Remain constant.
First increase then decrease.
Find the correct statement in monitoring a typical HSC performance indicator.
LTF and TRCF.
LNG and LPG.
O2 and CO2.
PSV and PRV.
What are typical set point values for the insulation space pressure relief valve?
+10 mbar above atmosphere pressure.
−50 mbar below atmospheric pressure.
+1 bar above atmospheric pressure.
Equal to cargo tank design pressure.
Why should we maintain a low cargo tank pressure during the inerting operation?
To reduce mixing of inerting gas and air during displacement.
To increase the rate of cargo evaporation.
To enhance ignition probability inside the tank.
To maximize oxygen concentration in the tank.
What is the limitation of combustible gas detector of catalytic combustion type?
It cannot be used for measurement in nitrogen.
It can only detect oxygen, not hydrocarbons.
It works only at cryogenic temperatures.
It requires liquid samples instead of gas samples.
Which of the following machinery is used for the initial pressurization of insulation space?
Nitrogen generator.
Cargo pump.
Boil-off gas compressor.
Refrigeration compressor.
How many portable multi gas detector should be carried onboard?
At least two stes with methane gas detection capability.
Only one set for the entire vessel.
One per cargo tank regardless of vessel size.
At least five sets for emergency use only.
What is the type of gas detection system fitted to monitor gas content of the insulation spaces?
Infrared type/sequential measurement.
Catalytic bead type only.
Flame ionization detector (FID) only.
Electrochemical oxygen sensor only.
Which is the melting point temperature of the ESDS automatic fusible element normally fitted onboard?
Between 98 °C to 104 °C.
Between 40 °C to 50 °C.
Between 150 °C to 180 °C.
Between 0 °C to 10 °C.
Under the pneumatic link system what will happen when the ship moved off the jetty exceeds its safe working limits?
Hose-break air pressure drop ESDS alarm sounded and ESD activated.
Only a visual alarm is activated on the jetty control panel.
Cargo pumps automatically increase discharge rate.
Inert gas system is shut down immediately without alarm.
Following are means of links available onboard to connect ships ESDS except...
Bluetooth link.
Pneumatic link.
Electrical hard-wire link.
Fibre optic link.
In ships ESDS an automatic electrical system which energies ESDS due to temperature change of the sensor fitted at each tank domes and both manifold platform is known as...
Automatic fusible element.
Cargo overfill sensor.
Pneumatic emergency link.
Pressure vacuum relief valve.
The stationary powder post should have a minimal capacity of...
2,5 kg/second.
0,5 kg/second.
1,0 kg/second.
5,0 kg/second.
What is the range of expansion ratio for high expansion foams?
1 000:1.
10:1.
50:1.
200:1.
A glass bulb under the cap of the soda acid type water extinguisher has a solution of...
Dilute sulfuric acid H2SO4.
Dilute hydrochloric acid (HCl).
Sodium hydroxide (NaOH) solution.
Distilled water.
RICE stand for...
Rest Ice Compression and Elevation.
Recovery, Immobilization, Cooling and Exercise.
Rest, Inspection, Care and Evaluation.
Rehabilitation, Ice, Circulation and Endurance.
Classification of burns and scald included the following except...
Fourth degree.
First degree.
Second degree.
Third degree.
Identify the correct statement from the following list, that describe the dangerous gases emitted from a sewage tank correctly.
Methane and hydrogen sulfide.
Oxygen and nitrogen.
Carbon dioxide and argon only.
Helium and neon.
The location of electrical equipment is often classified by zone, what does zone 1 means...
Flammable material is present – an explosive mixture can from in normal operation.
An explosive mixture is never expected to be present.
An explosive mixture is continuously present for long periods.
Only non-flammable gases are present during normal operation.
Quick closing valve is fitted on...
Fuel tank above double bottom tank.
Fresh water tank in accommodation spaces.
Ballast tank vent line.
Sewage holding tank discharge line.
What would you regard as the minimum allowable O2 content of a space you wish to enter?
20 % O2.
10 % O2.
15 % O2.
25 % O2.
For what purpose do we have deck spray on gas carriers?
The purpose of deck water spray is to cool the deck in case of fire and to be used for washing the deck.
To increase cargo pressure during loading operations.
To inert cargo tanks before maintenance.
To detect gas leaks around cargo pipelines.
Whare is the inert gas tapped which is lead to the oxygen analyzer?
At the inert gas discharge line to the bulkhead valve.
At the inert gas blower suction line.
At the scrubber seawater inlet line.
At the cargo tank vent riser outlet.
While commencement of loading cargo direct high pressure loading is advisable.
False.
True.
Only when loading refrigerated cargo.
Only if the cargo tanks are less than 50 % full.
What is the purpose of reliquefaction plant in gas carrier?
All of the above.
To increase the oxygen content in cargo tanks.
To heat cargo vapours before discharge.
To remove ballast water from cargo tanks.
When finishing a discharge on gas carrier it is usual to throttle in the cargo pump discharge valve to reduce the NPSH requirement and facilities stripping of the tank when should this not be done?
When using a booster pump.
When the cargo tank is fully loaded.
When operating the inert gas system.
When the cargo temperature is below ambient temperature.
The handle of a butterfly valve must be...
Parallel to the flow when in the fully open position.
Perpendicular to the flow when in the fully open position.
Pointing vertically upward when fully open.
Locked at a 45° angle when fully open.
What is the purpose of heat exchange in cargo handling system?
Condensers & intercoolers in a reliquefaction plant.
To increase the oxygen content of cargo vapours.
To separate ballast water from cargo.
To maintain inert gas pressure in cargo tanks.
Butadiene is incompatible with...
None of the above.
Propane only.
Ammonia only.
Methane and ethylene.
The concentration of a hydrogen gas in air below which there is insufficient hydrocarbon support combustion is called...
Lower flammable limit.
Upper flammable limit.
Auto-ignition temperature.
Flash point.
What are the factors influence the pumps suction condition?
The pumps NPSH.
The colour of the cargo.
The diameter of the vent mast only.
The number of ballast tanks in use.
Where would you look to find the properties & hazards of a gas carried on your ship?
ICS cargo data sheet.
Ballast water record book.
Ship’s engine log book.
Fire control plan.
Which inert gas system uses only gases from the ship’s main or auxiliary boilers?
The flue gas plant.
Nitrogen generator system.
Stored inert gas cylinder system.
Vapour recovery system.
What is the critical temperature of ethylene in degree Celsius?
9,9 °C.
−103,7 °C.
35,0 °C.
−56,6 °C.
What is the chemical used in driers to absorb moisture?
Silica gel.
Sodium chloride.
Calcium carbonate.
Ammonium nitrate.
The most common valve used on LNG are:
Gate valve, globe valve & butterfly valve.
Ball valve, check valve & needle valve.
Diaphragm valve, plug valve & relief valve.
Solenoid valve, piston valve & pinch valve.
High expansion foam system is suitable for fighting fires in:
Engine room.
Cargo oil tanks only.
Open deck fires only.
CO₂ storage rooms only.
How can you determine which grades of cargo a tank vessel is permitted to carry?
Refer to the vessel certificate of inspection.
Check the ship’s radio licence.
Look at the engine room log book.
Refer to the ballast water management plan.
The master is the incharge of the technical team:
True.
False.
Polarographic cells are not sensitive to which of the following gases:
Carbon dioxide.
Oxygen.
Hydrogen.
Carbon monoxide.
Methanol is common:
Alcohol.
Acid.
Salt.
Hydrocarbon.
What is the vapour relative density for propane?
1,55.
0,98.
2,10.
0,45.
Temperature control of cargoes means:
Applying warming up/cooling down in a controlled manner.
Increasing cargo pressure to maximum limits.
Removing inert gas from cargo tanks.
Changing cargo density by mixing with seawater.
What is span gas used for on a liquefied natural gas carrier?
Calibrate the gas leak detector.
Increase cargo temperature during loading.
Reduce oxygen content in cargo tanks.
Neutralize cargo vapours in the vent mast.
How is BOILOFF gas generated?
Evaporation, heat ingress, drop in pressure.
Compression of cargo vapours only.
Injection of inert gas into cargo tanks.
Chemical reaction between cargo and steel.
What are the necessary conditions that must take place for an electrical discharge to occur?
Electrostatic accumulation.
High cargo viscosity.
Low ambient humidity only.
Presence of ballast water in tanks.
Gas ships cargo compressor room and cargo tank area are:
Gas dangerous.
Oxygen enriched spaces.
Non-hazardous enclosed spaces.
Safe for continuous accommodation use.
On board LNG tanker which of this equipment is not required for gas burning:
Vacuum pump.
Gas compressor.
Gas heater.
Gas control valve system.
Which of these would you consider essential equipment to carry when working on the deck of a ship carrying ammonia?
Gas mask.
Welding helmet.
Lifejacket only.
Ear protection only.
What is the condition of the inert gas as it is produced by the boiler or inert gas generator?
Free of oxygen and clean.
Highly flammable and dry.
Rich in hydrocarbons and toxic gases.
Saturated with seawater vapour.
What is the main danger to be guarded against when discharging using a cargo heater with seawater as the heating medium?
Freezing of water side of the heater.
Overheating of cargo tanks due to inert gas expansion.
Excess oxygen entering cargo lines.
Contamination of cargo with lubricating oil.
If cargo density is different from that specified by the float gauge manufacturer, what will you adjust?
Float correction.
Cargo temperature setting.
Pump discharge pressure.
Inert gas flow rate.
It is always necessary to bring down the GEEL to the:
Absolute minimum.
Maximum allowable level.
Atmospheric pressure level only.
Tank design pressure.
The vapour, which is caught in the space over the incoming liquid during loading and compressed is sent to the:
Shore tank.
Engine room bilge tank.
Ballast water tank.
Inert gas generator.
What are the two types of insulation system used on the Moss tank?
Flat panel insulation and spiral generation.
Spray-on polyurethane foam and vacuum insulation.
Fiberglass blanket and aluminium foil wrapping.
Layered rubber membrane and water-cooled shielding.
Which chapter of the IGC Code refers to the summary of minimum equipment requirements for an LNG carrier?
Chapter 19.
Chapter 7.
Chapter 12.
Chapter 3.
The temperature at which the liquid starts boiling is called:
Boiling temperature.
Flash point.
Freezing point.
Ignition temperature.
On a membrane class LNG tanker, upon completion of cargo, how is the remaining liquid in the discharging arm drained?
By opening one of the aft cargo tank loading valve with ship trimmed by stern.
By increasing inert gas pressure in the cargo lines.
By using the ballast water ejector system.
By heating the discharge arm with steam injection.
Where is the suitable measuring point for monitoring the oxygen content for a cargo tank to achieve the desired end result for its aerating operation?
Individual loading line.
Engine room ventilation outlet.
Ballast water discharge line.
Inert gas generator exhaust stack.
What happens when heat is transferred to the liquid cargo (LNG) during cargo operation or during a voyage?
It generates boil-off from the cargo.
It increases the oxygen content in the cargo tank.
It eliminates vapour pressure completely.
During the ballast voyage after discharging what is the expected change in terms of pressure in insulation spaces?
IS pressure will rise and nitrogen exhaust control valve will open to vent.
IS pressure will drop and vacuum breakers will open to admit air.
IS pressure remains constant and no automatic valves operate.
IS pressure increases causing cargo pumps to auto-start.
Onboard a membrane class LNG tanker, during purging of a cargo tank with LNG, what should be done when a methane content of 5 % by volume (CH₄) is detected at the common mast riser?
Exhaust gas is directed ashore or to boilers.
Purging is stopped immediately and tanks are inerted with air.
Cargo loading is commenced immediately without further checks.
The inert gas system is shut down and ventilation stopped.
Onboard LNG carrier, which computer-based system is used for calculating the cargo loaded/discharged?
Custody transfer system.
Ballast water management system.
Engine monitoring system.
Voyage data recorder system.
Which type of LNG carrier propulsion system will typically have a reliquefaction plant onboard?
Low speed diesel.
Steam turbine only.
Gas turbine with open cycle.
Nuclear propulsion system.
Onboard an LNG tanker during gas burning, what operation is available if the LD compressor is out of service during gas burning?
Gas burning can be continued via free flow.
Gas burning must be stopped immediately.
Cargo tanks must be inerted with air.
LNG cargo discharge must be reversed to shore.
What is the quantity of heat absorbed on vaporization at normal boiling point?
Latent heat.
Specific heat capacity.
Sensible heat.
Heat of combustion.
In case of heating the mercury column containing the test liquid, the level of mercury:
Will decrease.
Will increase.
Will remain constant.
Will fluctuate randomly depending on pressure only.
During heat transfer from one body to another, what transfer takes place?
Energy.
Mass.
Momentum.
Pressure.
Purified natural gas is liquefied by cooling to -161,5 °C. What will be the ratio of initial volume of the gas to the final volume of the liquid?
600:1.
100:1
50:1
1000:1
Saturated vapour pressure of a substance can be defined as the pressure exerted by:
A saturated vapour at a specific temperature.
A dry gas at constant volume.
A liquid at its freezing point.
An inert gas mixture in a closed tank.
There are a few components in LNG. Identify one with 1-8 % presence from the options below:
Ethane.
Propane.
Butane.
Pentane.
You are using the displacement method for inerting cargo tanks. If mixing occurs, what will happen to the quantity of inert gas required?
3 to 5 times IG is required.
No additional inert gas is required.
Only half the normal inert gas quantity is required.
Inert gas requirement is reduced to zero.
For effective replacement of gas in a tank by displacement, which of these is important?
A suitable piping arrangement.
High cargo pump discharge pressure.
Maximum tank agitation.
Increasing cargo temperature.
Statement on the goals of the International Safety Management (ISM) Code and Safety Management System (SMS) are listed. Find one statement that captures the said goals succinctly:
These tools aid compliance with regulation as well as embed the safety culture needed to improve safety performance.
These tools are mainly designed to increase ship speed and efficiency.
These tools are only used for documentation and record keeping.
These tools replace the need for onboard navigation systems.
The result of the safety culture assessment must be used in the organization continuous improvement program and not because:
The analysis is likely to uncover areas of cost saving and thereby enhance profitability to the organization which will impact all.
It is required only for insurance purposes.
It is used solely to reduce crew workload.
It is only relevant for port state control inspections.
What is the typical measuring range for an oxygen analyzer?
0-25 % volume in air.
0-100 % volume in air.
10-50 % volume in air.
0-5 % volume in air.
During cool down / loading of cargo, what is the expected change in terms of pressure in insulation space?
IS pressure will drop and nitrogen make-up valve will open.
IS pressure will rise and relief valves will lift continuously.
IS pressure remains constant with no valve action.
IS pressure becomes negative and air is admitted automatically.
Why is inert gas preferred over nitrogen for inerting cargo tanks?
Nitrogen is more expensive and quantity required is large.
Nitrogen is highly flammable compared to inert gas.
Nitrogen reacts with cargo vapours to form toxic compounds.
Nitrogen cannot be stored onboard in any form.
How does bringing down the dew point of cargo tank atmosphere help?
Prevent ice formation in valves and pumps.
Increase cargo vapor pressure for faster discharge.
Promote corrosion of cargo piping.
Improve oxygen content for combustion.
Onboard a membrane class LNG tanker, what is the typical differential pressure status maintained between the primary and secondary insulation space?
Primary IS pressure > secondary IS pressure.
Secondary IS pressure > primary IS pressure.
Both spaces are maintained at atmospheric pressure always.
Onboard a membrane class LNG tanker, what is the typical gas heater outlet temperature control set at during inerting operation using nitrogen?
−20 °C / 68 °F.
+50 °C / 122 °F.
0 °C / 32 °F.
What is the type of gas detection system fitted for space with air?
Catalytic combustion type.
Infrared absorption type only.
Electrochemical oxygen type only.
Thermal conductivity type only.
Onboard a membrane class LNG tanker during operation, what will happen if a cargo tank pressure is below or equal to 5 mbar gauge than primary insulation space pressure?
HD & LD will automatically stop.
Cargo pumps will automatically increase speed.
Inert gas system will switch to air intake mode.
Boil-off gas production will immediately double.
What is the requirement alarm set point for monitoring insulation space?
30 % LEL of methane.
10 % LEL of methane.
50 % LEL of methane.
20 % by volume oxygen concentration.
During inerting operation using nitrogen why is it significant to maintain gas heater outlet temperature control at -20°C?
To ensure nitrogen supply to the tank is heavier then the air in the tank.
To prevent nitrogen from condensing into a liquid inside the cargo tank.
To increase the oxygen content of the inert gas mixture.
To maintain positive pressure in the cargo pumps during operation.
Liquefied gas tankers are categorized as per the cargo carried as...
LPG ships, LEG ships, LNG ships.
Crude oil tankers, product tankers, chemical tankers.
Bulk carriers, container ships, Ro-Ro ships.
Membrane ships, double-hull ships, single-hull ships.
There are three types of gas tankers according to the carriage condition?
Fully pressurized ship , semi pressurized ,fully refrigerated ship.
Double-hull ship, single-hull ship, membrane ship.
LNG carrier, crude oil tanker, chemical tanker.
Self-propelled ship, towed barge, articulated tug barge.
The cargo area of a gas tanker which is not equipped in an approved manner to ensure that its atmosphere is at all times maintained in safe manner is a...
Gas dangerous space.
Gas safe space.
Non-hazardous area.
Controlled ventilation zone.
A space other than a gas dangerous is known as...
A gas safe space.
A restricted cargo space.
A hazardous enclosed space.
A controlled atmosphere space.
Can hot work in dangerous and hazardous area be carried out during cargo operations or tank cleaning?
No.
Yes, with the Master\'s permission only.
Yes, if portable gas detectors are available.
Yes, provided the ventilation system is running continuously.
Air intakes for accommodation and engine room have to be at a minimum safe distance from ventilation outlet from...
Gas dangerous spaces.
Ballast tanks.
Fresh water tanks.
Steering gear compartments.
Access from a gas dangerous zone on the open weather deck to a gas safe space is arranged through...
An airlock.
A watertight door.
A ventilation trunk.
A pressure relief chamber.
Fill in the blanks airlock doors should be self-closing and there must not be any hook or other device by which they could be held open. There should be minimum distance of at least...
1,5 meter.
0,5 meter.
3,0 meter.
5,0 meter.
An audible and visual alarm system gives a warning on both side of the airlock when...
more then one door is moved from the closed position.
One door is opened for normal access.
The ventilation system is started.
The pressure inside the cargo tank increases.
The gas safe and airlock spaces within the cargo area have...
Positive pressure ventilation.
Negative pressure ventilation.
No ventilation requirement.
Natural ventilation only.
When the over pressure of airlock or gas safe space is lost?
All electrical equipment that is not a certified safe type should be de- energized.
Cargo operations must continue without restriction.
Only lighting systems remain in operation.
Ventilation fans should be stopped immediately.
Segregation separation and airlock are fundamental to the safety of...
Gas tanker.
Container ship.
Bulk carrier.
General cargo vessel.
List the dryers used with an inert gas generation on gas shps to dry the inert gas generated...
Refrigerated drier & absorption drier.
Mechanical filter & centrifugal separator.
Heat exchanger & condenser unit.
Vacuum pump & compressor system.
What is the atmospheric boiling point of methane...
-161,5 °C.
−111,9 °C.
−34,0 °C.
−196,0 °C.
What is the atmospheric boiling point of propane?
−42,3 °C.
−161,5 °C.
−89,0 °C.
−12,0 °C.
What is the atmospheric boiling point of butane?
−0,5 °C.
−42,3 °C.
−161,5 °C.
−89,0 °C.
What is the vapour relative density of Methane?
0,554.
1,52.
0,97.
2.01.
What is the vapour relative density of Propane?
1,55.
0,55.
0,97.
2,10.
What is the vapour relative density of Butane?
2,09.
0,65.
1,15.
1,75.
What is the operation carried out prior to cooling down the tank on fully refrigerated liquified gas carrier?
Gassing up.
Inerting.
Purging with air.
Warm-up circulation.
What is the operation carried out prior to gassing up the tank on liquid gas carrier?
Inerting.
Cooling down.
Gas freeing.
Tank washing.
Requirement for cargo tank entry with respect to tank atmosphere check of Hydrocarbon content...
Hydrocarbon content must be less than 1 % LFL.
Hydrocarbon content must be less than 10 % LFL.
Hydrocarbon content must be less than 50 % LFL.
Hydrocarbon content must be less than 100 % LFL.
What is the vapor relative density of chlorine?
2,49.
0,97
1,52.
3,21.
What is the auto ignition temperature of ethylene oxide?
429 °C.
365 °C.
520 °C.
610 °C.
What is the auto ignition temperature of propylene oxide?
465 °C.
380 °C.
512 °C.
600 °C.
What is the critical pressure of propane in bars absolute?
42,6 bar absolute.
46,2 bar absolute.
37,8 bar absolute.
52,0 bar absolute.
What is the critical pressure on n butane in bars absolute?
38,1 bar absolute.
42,6 bar absolute.
29,4 bar absolute.
50,0 bar absolute.
What is the critical pressure of methane in bars absolute?
44,7 bar absolute.
37,2 bar absolute.
50,5 bar absolute.
42,6 bar absolute.
What is known as inert gas?
Non flammable gases containing insufficient oxygen to support combustion.
Any gas with oxygen content above 21 %.
A gas that always supports combustion at low temperature.
A mixture of hydrocarbon vapours and air.
What is the critical pressure of ethylene in bars absolute?
50,5 bars absolute.
42,6 bars absolute.
38,1 bars absolute.
44,7 bars absolute.
LNG fire is classified under which class of fire?
Class C fire.
Class A fire.
Class B fire.
Class D fire.
Which fixed fire fighting system is mandatory for fire fighting on the deck of liquefied gas carrier?
Fixed DCP system.
CO2 flooding system.
Foam total flooding system.
Water mist system.
What to do in case the general emergency alarm sound?
Wear PPE, lifejacket , carry immersion suit.
Continue normal cargo operations until instructed otherwise.
Go to engine room immediately without equipment.
Start firefighting equipment on deck.
What is critical temperature?
The temperature above which a gas cannot be liquefied by pressure alone.
The temperature at which all gases become solid.
The temperature at which a liquid starts to boil under vacuum.
The lowest temperature at which a substance can exist as a vapor.
What is flammable range?
A mixture of flammable gas in air whose gas percentage is between the LFL and UFL.
The temperature range where all gases become inert.
The pressure range between atmospheric and critical pressure.
The oxygen concentration range below 5 % in air.
What is flash point?
The lowest temperature at which a liquid gives off sufficient vapour to form a flammable mixture with air near the surface of the liquid.
The temperature at which a liquid starts to boil at atmospheric pressure.
The temperature at which vapour becomes inert and non-reactive.
The highest temperature at which a gas remains stable under pressure.
The ships general emergency alarm is...
Seven or more short blasts followed by one long blast.
Three long blasts.
One short blast repeated continuously.
Two long and two short blasts.
What operation is done on fully refrigerated gas carriers before loading?
Cooling down.
Inerting.
Gassing up.
Tank heating.
What operation is done on fully refrigerated gas carriers before gassing up after getting out from dry dock?
Inerting.
Cooling down.
Purging with cargo vapour.
Nitrogen removal by ventilation.
What is the chemical formula of vinyl chloride?
CH2H3CI.
C2H6Cl2.
CH3CH2Cl.
C2H4Cl2.
Critical temperature for Propane...
96,8 °C.
82,5 °C.
110,3 °C.
134,2 °C.
Critical temperature of Methane...
-82,5 °C.
−42,3 °C.
−96,8 °C.
−61,5 °C.
Critical temperature of Ethylene...
9,9 °C.
−42,3 °C.
35,0 °C.
−10,5 °C.
Independent type B tank on gas carrier are....
Completely self supporting when full or empty.
Integrated into the ship’s hull structure.
Supported only when cargo is loaded.
Dependent on insulation space pressure for strength.
The maximum allowable tank design pressure in the vapour space for independent type A tank...
0,7 bar.
2,0 bar.
5,0 bar.
1,5 bar.
The IGC code stipulates the secondary barrier must be able to contain tank leakage for a period of how many days?
15 days.
5 days.
30 days.
7 days.
What are the symptoms as asphyxiant when LPG and LNG carried as cargo?
All of the above.
Headache and dizziness only.
Skin irritation and coughing only.
Increased appetite and thirst.
Inert gas – how is sea water supplied to the deck seal?
Through the deck seal pump fitted in the engine room.
By gravity feed from ballast tanks.
By compressed air line from cargo compressor.
By cargo pump discharge line.
On tank vessels which of these valves types is most commonly used in conjunction with hydraulically actuated control?
Butterfly valve.
Gate valve.
Globe valve.
Needle valve.
The valve best suited for throttling gas or liquid flow in a pipeline is the...
Globe valve.
Gate valve.
Ball valve.
Check valve.
What is the boiling point at atmospheric pressure of ammonia?
-34 °C.
−78 °C.
−161 °C.
−12 °C.
What tanks are self supporting and do not form part of the ships hull structure?
Independent tanks.
Membrane tanks.
Integral tanks.
Cofferdam tanks.
Ammonia form explosive compound with...
Mercury, chloride, iodine, bromine.
Oxygen, nitrogen, argon, helium.
Carbon dioxide, methane, propane, butane.
Water, steam, seawater, fresh water.
A bigger spell of LPG will be visible as a...
White cloud which is condensed wate vapour from the atmosphere.
Black smoke due to carbon combustion.
Colourless gas with no visible effect.
Yellow flame caused by oxidation.
What are the necessary condition that must take place for an electrical discharge to occur?
Electrostatic accumulation.
Continuous grounding of all equipment.
Presence of inert gas only.
High humidity in the atmosphere.
Gas ship cargo compressor room, cargo tank area are....
Gas dangerous.
Gas safe.
Non-hazardous.
Restricted ventilation zones.
On board LNG tanker which of these equipment is not required for gas burning?
Vacuum pump.
Gas combustion unit.
Gas valve unit.
Boiler burner control system.
Which of these would you consider essential equipment to carry when working on the deck of ship carrying ammonia?
Gas mask.
Safety helmet only.
Cotton gloves.
Ear protection plugs.
What is the condition of the inert gas as it is produced by the boiler or inert gas generator?
Free of oxygen and clean.
Fully saturated with oxygen for stability.
Mixed with hydrocarbon vapours.
High in moisture and combustible gases.
For what reason cargo sampling is necessary in as tanker?
Both A & B.
To increase cargo temperature during discharge.
To reduce tank pressure automatically.
To remove inert gas from the tank.
The valve best suited for throttling gas or liquid flow in a pipeline is the...
Globe valve.
Gate valve.
Ball valve.
Check valve.
What is the main dander to be guarded against when discharging using a cargo heater with sea water as the heating medium?
Freezing of the water side of the heater.
Overheating of cargo pump motor.
Excess oxygen entering cargo tank.
Loss of inert gas pressure in ballast tanks.
If cargo density is different from that specified by the float gauge manufacturer what will you adjust?
Float correction.
Tank pressure setting.
Pump discharge rate.
Vapour return line capacity.
What is the guiding rule for limiting pressure surge during loading or discharging?
All of the above.
Maintain gradual valve operation only.
Avoid sudden pump start/stop.
Control flow rate changes slowly.
Outcome of complying with IGC Code are listed as below...
Award of international Certificate of Fitness for carriage of liquified gas in bulk.
Issuance of cargo manifest approval certificate.
Automatic classification of vessel as oil tanker.
Exemption from all port state control inspections.
The latent heat is termed as latent heat of vaporization in the case of...
Boiling.
Freezing.
Condensation.
Solidification.
What is the latest propulsion solution introducing to the LNG shipping industry?
Low speed diesel with a BOG requefaction plant.
Steam turbine propulsion only.
Gasoline dual-fuel engines.
Nuclear propulsion system.
The pressure applied at the sea level is called as...
Atmospheric pressure.
Gauge pressure.
Vacuum pressure.
Hydrostatic pressure.
The balancing pipeline lying between the shore tank and the ship is called as...
Vapour return line.
Cargo discharge line.
Inert gas line.
Ballast transfer line.
Why is the moss LNG cargo tank fitted with external insulation?
To reduce boil-off.
To increase cargo pressure.
To improve cargo pumping rate.
To allow faster loading operations.
What is the ideal location for a cargo tank from the shell plating, in a gas tanker type?
Less than 760 mm from the shell plating.
More than 3 000 mm from the shell plating.
Directly attached to the shell plating.
Above the main deck level only.
In the cargo tank of a moss type LNG tank where are the pump pipe work and cabling secured?
Tabular tower inside the cargo tank.
External cargo manifold system.
Double bottom ballast tanks.
Insulation space outside the tank.
Which equipment is used to produce dry air for cargo tanks aerating operation?
IG plant on dry air production mode.
Cargo vapour compressor operating in recirculation mode.
Nitrogen generator operating in purge mode.
Deck water seal air blower.
In a low duty gas compressor the lubricating oil must not get into the LNG vapor compressed by the LD compressor identify that arrangement correctly from the listing...
The seal gas system.
The intercooler drain system.
The compressor suction strainer arrangement.
The cargo tank spray line system.
Apart from oxygen content what other check should be carried out on the tank atmosphere prior man entry?
Toxicity and combustible gas mixtures.
Cargo temperature and tank pressure.
Humidity level and dew point.
Ballast tank water level and density.
Onboard a moss cargo tank LNG carrier what is the desired tank shell temperature at equator to declare cargo tank cool down operation is completed?
-113 °C.
-80 °C.
-95 °C.
-140 °C.
Onboard an LNG tanker, what is the optimum methane liquid pressure to be maintained into the vaporize inlet during forced boil off operation?
5 bar gauge/73 psig.
2 bar gauge/29 psig.
8 bar gauge/116 psig.
12 bar gauge/174 psig.
What is the medium used for inerting cargo tank?
Inert gas.
Compressed air.
Oxygen-enriched air.
Fresh water mist.
Pick the IEC symbol for explosion proof electrical protection.
Ex-d.
Ex-i.
Ex-p.
Ex-e.
A typical membrane method nitrogen generators air compressor will trip when the following occur except...
Air compressor oxygen reading 20 % by volume.
High air compressor discharge temperature.
Low lubricating oil pressure.
High air compressor discharge pressure.
What is the main reason for a membrane class LNG tanker to retain a small quantity of cargo during ballast passage?
For cold maintenance of the cargo tanks.
To improve the vessel\'s trim and stability.
To keep cargo pumps submerged at all times.
To reduce ballast water treatment requirements.
During aeration operation the cargo tank pressure is kept low, how does this help the operation?
Aids the piston effect by forming a defined gas interface.
Increases nitrogen consumption efficiency.
Prevents hydrate formation in ballast tanks.
Improves cargo pump discharge rate.
What is the IGC Code definition for a liquified gas?
Product having a saturated vapor pressure of 2,8 bar absolute at 37,8 °C (100 °F).
Product having a boiling point below -50 °C at atmospheric pressure.
Product that becomes liquid only under refrigeration below -20 °C.
Product stored exclusively in pressurised cylinders above 10 bar.
Saturated hydrocarbon produce...
Carbon dioxide.
Nitrogen oxide.
Hydrogen chloride.
Sulphur dioxide.
At what temperature will methane change from vapor to liquid at atmospheric pressure?
-161,5 °C/-259 °F.
-100 °C / -148 °F.
-120 °C / -184 °F.
-196 °C / -320 °F.
What is the process of transfer of thermal energy from a hot body to another at a lower temperature called...
Heat transfer.
Conduction resistance.
Thermal equilibrium.
Specific heat capacity.
What is the critical temperature pressure of methane?
-82,5 °C/-116 °F and 44,7 bar/646 psi.
-161,5 °C / -259 °F and 10,2 bar / 148 psi.
-56.6°C / -69.9°F and 73 bar/ 1057 psi.
-100°C / -148°F and 30 bar/ 435 psi.
There are a few components in the LNG identify one with 1-8 % presence from the options below?
Ethane.
Propane.
Butane.
Pentane.
You are using the displacement method for inerting cargo tanks. If mixing occurs, what will happen to the quantity of inert gas required?
3 to 5 times more IG is required.
The IG requirement remains unchanged.
50 % less IG is required due to dilution efficiency.
No IG is required once initial purge is completed.
When can roll over happen in an LNG storage tank?
When unstable strata of LNG form within the tank.
When tank pressure exceeds relief valve set pressure.
When boil-off gas compressor is shut down.
When cargo temperature reaches the methane critical temperature.
Which of the following statement is true for an ideal gas law if pressure = P, volume = V, temperature = T and C is constant?
PV/T = C.
P + V = CT.
PV = T/C.
P/VT = C.
At the end of inerting and before shutting down IG generator , cargo tanks pressure will be increased. Why?
To prevent air ingress by maintaining positive pressure.
To accelerate nitrogen removal from the tank.
To improve cargo pump suction performance.
To reduce boil-off gas formation rate.
What is the objective of drying cargo tank?
To reduce moisture content.
To increase oxygen concentration in the tank.
To raise the tank pressure for loading readiness.
To improve cargo pump lubrication efficiency.
After heating of cargo tank and prior to gasification the atmosphere in the cargo tanks is replaced with inert gas. Why this procedure is required?
To avoid the possibility of an explosive or flammable LNG/air mixture.
To increase the LNG vapor pressure for faster loading.
To reduce boil-off gas generation during warm-up.
To enhance cargo pump discharge efficiency.
What is the limitation of a combustion gas detector of combustion type?
Equalize the primary insulation space and vapor dome pressure of the affected cargo tank – it cannot be used for measurement in methane.
It cannot detect oxygen deficiency in enclosed spaces.
It only works accurately at temperatures above 100 °C.
It requires continuous liquid sampling for operation.
Onboard a membrane class LNG tanker what is the ideal pressure differential to be maintained between the cargo tank and insulation spaces?
Insulation space pressure is lower than cargo tank pressure.
Insulation space pressure is higher than cargo tank pressure.
Both pressures must be equal to prevent membrane stress.
Insulation space must always be maintained at atmospheric pressure only.
What is the normal in-service operating pressure difference between the primary and secondary insulation space?
Secondary IS pressure = primary IS pressure + 1-2 mbar.
Secondary IS pressure = primary IS pressure − 5-10 mbar.
Both insulation spaces are maintained at equal vacuum levels.
Primary IS pressure must always be atmospheric while secondary is pressurised.
Onboard membrane class LNG carriers during drying operation it is important to ensure the cargo tank pressure is above the primary insulation space pressure this is to avoid...
Inward collapse of primary barrier.
Excess boil-off gas formation.
Overheating of insulation material.
Oxygen enrichment of the cargo tank atmosphere.
What is the temperature at which gas saturates and the water vapor present begins to condense?
Dew point.
Flash point.
Boiling point.
Critical point.
What is typically the first action taken when there is a serious primary membrane leak?
Equalize the primary insulation space and vapor dome pressures of the affected cargo tank.
Immediately start cargo tank inerting with air.
Increase cargo tank pressure to maximum allowable limit.
Stop all insulation space monitoring systems.
During inerting operation using nitrogen why is it significant to maintain gas heater outlet temperature control at -20°C?
To ensure nitrogen supply to the tank is heavier than the air in the tank.
To increase nitrogen oxygen content for better mixing efficiency.
To prevent condensation of methane in the gas heater.
To raise the flammability limit of the tank atmosphere.
What is the medium used for the initial pressurization of insulation space?
Nitrogen.
Oxygen.
Dry compressed air.
Carbon dioxide.
During cargo tank inerting operation normally the IG is supplied via loading line and air is expelled via vapour dome. Why is this arrangement used?
The heavier IG is led to the bottom to displace the lighter air in the tank.
The lighter IG is led to the bottom to increase turbulence and mixing.
The vapour dome is used to compress IG before entry into the tank.
Air is expelled via the bottom to accelerate inerting efficiency.
You are using the displacement method for inerting cargo tanks. If mixing occurs, what will happen to the quantity of inert gas required?
3 to 5 times more IG is required.
The IG requirement is reduced by half due to dilution efficiency.
No additional IG is required once initial purge is completed.
IG demand remains unchanged regardless of mixing.
Onboard a membrane class LNG tanker during drying operation what will happen if a cargo tank pressure is below or equal to 5 mbar gauge than the primary insulation space pressure?
HD & LD will automatically stop.
Cargo pumps will start automatically.
Nitrogen supply will be diverted to vapour return line.
Primary insulation space will be depressurised to atmospheric pressure.
During the ballast voyage after discharge what is the expected change in terms of pressure in insulation space?
Insulation space pressure will rise and nitrogen exhaust control valve will open to vent.
Insulation space pressure will drop and vacuum breakers will open automatically.
Insulation space pressure remains constant with no valve action required.
Insulation space pressure is transferred to the cargo tank vapour space.
Which is the melting point temperature of the ESDS automatic fusible element normally fitted onboard?
Between 98 °C to 104 °C.
Between 50 °C to 60 °C.
Between 150 °C to 160 °C.
Between 200 °C to 220 °C.
Which of the following is not part of an arrangement in fibre optical system to accommodate fail safe ESDS system?
Optical cable protected with double layer of insulation.
Redundant fibre optic signal paths for system reliability.
Continuous self-diagnostic monitoring of signal integrity.
Fail-safe signal default to shutdown on loss of transmission.
In ESDS pneumatic link system which equipment is used to sense and monitor the air pressure in the system so that the ESDS will activate if the air pressure in system fall below set point?
Pressure switch.
Flow meter.
Thermocouple.
Relief valve.
The following are the communication connection integrated in the ESDS fibre system EXCEPT:
Satellite telephone connection.
Redundant fibre optic communication link.
Control room alarm interface.
Cargo control system network interface.
What does ESDS stand for?
Emergency Shutdown system.
Emergency Safety Drain System.
Electronic Signal Detection System.
Emergency Supply Distribution System.
Under the pneumatic link system what will happen when the ship moved off the jetty exceed its safe working limit (hose break/air pressure drop)?
ESDS alarm sounds and ESD is activated.
Only visual alarm is activated with no shutdown.
Cargo pumps increase speed to compensate pressure loss.
Nitrogen system automatically isolates the jetty manifold.
In ship ESDS an automatic electrical system which energize ESDS due to temperature change of the sensor fitted at each tank dome and both manifold platform is known as...
Automatic fusible element.
Pressure differential switch.
Optical flame detector relay.
Pneumatic trip valve system.
Following are means of links available on board to connect ships ESDS to shore ESDS EXCEPT:
Bluetooth link.
Fibre optic link.
Hardwired electrical umbilical cable.
Pneumatic signal link.
Which of the following will not cause an activation of the ESDS?
Differential pressure between primary and secondary insulation space too low.
Emergency shutdown push button activation.
Excessive ship movement exceeding loading arm limits.
Loss of pneumatic control signal in the link system.
The guiding rules for limiting pressure surge on loading or discharging in general of liquefied gas tank ship related to the ESD system find the correct sequence:
Stop the cargo pump → close the ESD → close the other ESD.
Close both ESD valves → start cargo pump → open loading line.
Open ESD → increase pump speed → then stop cargo pump.
Activate alarm → open vapour return → then close cargo valves.
