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Cargo Cooling Systems of Gas Carrier

CBT 12 questions

First 5 of 12 questions — with answers

The correct answer is marked. Unlock the rest to study the whole test, online or offline.

  1. Question 1

    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.

  2. Question 2

    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.

  3. Question 3

    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.

  4. Question 4

    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.

  5. Question 5

    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.

Preview — 5 of 12 questions

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About this CBT test

Cargo Cooling Systems of Gas Carrier is a CBT test with 12 questions and verified answers. Common topics include: cargo, pressure, liquefaction, fluid, compressor, cycle, plant, point.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

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