Answers to CES test about Basic Hydraulic System

Welcome to the website where you can find answers for the Computer Based Test (CBT) also known as Crew Evaluation System (CES) on the subject «Basic Hydraulic System». This site will help you as a marine specialist improve your knowledge with the help of open information, where you can find questions as well as answers for them. CES/CBT based on practical information and marine specialists experience.

CES & CBT 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.

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 «Basic Hydraulic System». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.

«Basic Hydraulic System» subject includes theoretical and practical information about basics of the hydraulic system. Knowledge of this information directly shows employee’s competence who holds a relevant post on a vessel, provides to know the basics of hydraulic systems used on ships, be able to control pressure, understanding common reasons for failures in order to avoid them.

This page contains answers to Seagull CES CBT (Crew Evaluation System/Computer Based Test) test about Basic Hydraulic System, and serve as a database of questions and answers, using which seafarer can prepare to exams for getting certificate of competence, or just to challenge yourself with knowledge in this theme.

Use the search below to find question.

Amount of questions: 16.

Right answers marked with this sign .

By reducing the flow, the torque will:

Be reduced.

Be the same.

Be higher.

Counterbalance valve is used:

To support a load and prevent “creeping”.

To unload the delivery pump.

It is the same as a check valve.

Energy not used to move the load in a hydraulic system turns into what?

Pressure.

Heat.

Noise.

How much pressure will a force of 2 000 N create in a cylinder with a piston area of 0,0025 m²?

400 kPa.

800 kPa.

1 600 kPa.

Internal leaks create:

Faster movement of the actuator.

Higher pressure in the system.

Heat.

Is hydraulic oil compressible?

No.

Approx. 1/2 % pr. 7 MPa.

10 % pr. 5 MPA.

Movement of the actuator depends on:

Pressure.

Flow.

Pascal’s law says:

Force = pressure * area.

Force = pressure / area.

Force = pressure + area.

Rate of flow determines:

Torque.

Speed.

Pressure.

What creates pressure in a hydraulic system?

The directional valve.

The resistance to flow.

The pump.

What is the most common reason for failures in hydraulic systems?

The use of the wrong type of oil.

Water in the oil.

Contamination of the oil.

What type of gas should be used to charge an accumulator?

Compressed air.

Nitrogen.

Oxygen.

When do we use a pilot operated check valve?

To reduce load.

To prevent overload.

To prevent creeping.

Which statement is not true?

Hydraulics has a simple design, few parts and is easy to operate.

Hydraulics cannot be used in hazardous condition.

Hydraulics produce constant torque with variable speed.

Which statement is true?

Hydraulic components need external lubrication.

Difficult to control speed of actuator.

Hydraulic components have a high power to weight ratio.

Which type of pump is most common in hydraulic systems?

Positive displacement pump.

Non-positive displacement pump.