Welcome to the website where you can pass online the CES CBT CD-0396 test on the subject «Cargo Cooling Systems of Gas Carrier». 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.
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 «Cargo Cooling Systems of Gas Carrier». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Cargo Cooling Systems of Gas Carrier» subject includes theoretical and practical information about advanced training for work on any type of vessel. The test delves into the intricate mechanisms and operational protocols essential for maintaining optimal cargo temperatures on gas carriers. It offers a comprehensive overview of the latest cooling technologies, including cryogenic systems, which are crucial for transporting liquefied natural gas (LNG). Practical training components focus on the safe operation and maintenance of these systems, ensuring crew members are well-prepared for various maritime conditions and emergencies. Theoretical aspects cover thermodynamics, heat transfer and the chemical properties of gases, providing a solid foundation for understanding the principles behind cooling system design. This advanced training also emphasizes environmental compliance, highlighting the importance of minimizing emissions and adhering to international maritime regulations. Additionally, the course includes hands-on simulations and real-world case studies to enhance problem-solving skills and operational efficiency. By mastering this test, maritime professionals can significantly enhance the safety and reliability of gas carrier operations, contributing to the global energy supply chain.
On this site Crew Evaluation System Test on the subject «Cargo Cooling Systems of Gas Carrier» contains 12 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.
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Exam
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* Some questions may have more than 1 correct answer.
Cooling or Liquefaction plants are one way of keeping the pressure inside cargo tanks within acceptable limits. What other methods are commonly used? Select the TWO correct answers.
Burning the gas in a gas combustion unit.
Transferring some of the cargo to other tanks.
Some cargoes like LNG can be used in the main propulsion plant.
Venting the cargo.
During the cargo liquefaction process, from what point is cargo taken? Select the ONE correct answer.
It is taken as vapour, from the top of the cargo tank.
It is taken as liquid, from the bottom of the cargo tank.
It is taken at the surface of the liquid, where its removal will have the greatest cooling effect.
It is taken from just below the surface of the cargo, where its removal will have the greatest cooling effect.
If the working fluid is pure, then what determines the compressor discharge pressure in a vapour compression cycle? Select the ONE best answer.
The inlet pressure of the compressor.
The speed of the compressor.
The temperature in the condenser, which largely depends on the temperature of the coolant.
The volume of the condenser.
The pressures and temperatures at the compressor discharge in a liquefaction plant do not match those given for the cargo on the compressor data sheet. What could be the reasons for this? Select the TWO best answers.
The cargo is not pure and therefore not exactly the same as that used for the data sheet.
The compressor is old.
The data sheet is wrong.
Non-condensable gases have collected in the condenser.
We are heating a liquid and it is boiling. How can we increase its temperature? Select the ONE correct answer.
Increase the pressure above the fluid.
Decrease the pressure above the fluid.
Increase the amount of heat added.
The temperature of the liquid will rise anyway, provided we keep the pressure constant.
What do we mean by the «critical point» of a fluid and why is it important? Select the ONE correct answer.
It is the point at which enough latent heat has been gained to turn a liquid into a vapour. It is the point at which we can start to compress the vapour.
It is the temperature and pressure at which the liquid and vapour phases co-exist. There is no latent heat, so we cannot use the fluid in a refrigeration cycle.
It is the point at which enough latent heat has been removed to turn a liquid into a solid. It must be avoided for good heat transfer.
It is the point at which enough latent heat has been removed to turn a vapour into a liquid. It is the point at which the fluid exits the condenser.
What do we mean by the «enthalpy» of a fluid? Select the ONE correct answer.
The amount of heat energy required to make it boil at atmospheric pressure.
The amount of heat energy required to raise its pressure by one bar once it is boiling.
The amount of heat energy required to raise its temperature by one degree at atmospheric pressure.
The total heat energy that it has, usually given per kg of fluid.
What is the most likely cause of a very sudden rise in the condenser pressure of an open cycle direct cargo cooling plant? Select the ONE best answer.
The condenser has become full of liquid cargo because its capacity has been exceeded.
The cargo contains fractions of another gas.
The sea water temperature has risen.
There are some impurities in the cargo.
What should be done with non-condensable gases in a vapour compression refrigeration cycle? Select the ONE correct answer.
They should be bled off from the top of the condenser, with due regard to any polluting or other effects.
Filter driers will absorb them and therefore these need to be regularly changed.
Nothing needs to be done, they will circulate naturally.
They should be bled off from the compressor discharge pipe, with due regard to any polluting or other effects.
What type of cargoes would need to use a cascade cooling plant? Select the ONE correct answer.
Those that are particularly flammable.
Those with a high boiling point.
Those with a high critical temperature.
Those with a low boiling point.
Why can Ethane not be condensed using a seawater cooled condenser? Select the ONE correct answer.
The condenser pressure would be too high.
Ethane cannot be turned into a liquid, except in a laboratory.
Ethane reacts with seawater.
The volume of seawater required to remove the required amount of heat would be too great.
Why do some impurities in the cargo cause a high pressure in the cargo tank? Select the ONE best answer.
Because they are denser.
Because they have a lower boiling point or do not condense.
Because they form liquids which take up volume in the cargo tank.
Because they react to form new compounds.
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