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Inert Gas Generator

CBT 70 questions

First 5 of 70 questions — with answers

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  1. Question 1

    A water column type pressure vacuum breaker device may be fitted to the deck main of an inert gas system. Which of the statements given in the options is true?
    • This type of device is usually designed to operate before the deck water seal reaches it's limit.
    • This type of device is usually designed to operate only after the deck water seal fails.
    • This type of device is intended to protect individual tanks against overpressure or under vacuum.

  2. Question 2

    An independent inert gas generator is supplying the inert gas during cargo discharge operations when the low pressure alarm sounds. Which one of the giving options is most likely to automatically happen when such a condition develops?
    • Automatic shutdown of the cargo pumps.
    • Deck main valve closes and the automatic vent opens.
    • Automatic shutdown of inert gas generator.
    • Pressure vacuum breaker operates on deck.

  3. Question 3

    Complete the following statement to give the IMO definition of an inert condition for a cargo tank. A condition in which the oxygen content throughout the atmosphere of a tank has been:
    • Reduced to 8 % or less by volume by addition of inert gas.
    • Reduced to 20 % or less by volume by addition of inert gas.
    • Reduced to 16% or less by volume by addition of inert gas.
    • Reduced to 0 % by volume by addition of inert gas.

  4. Question 4

    Considering an oil tanker fitted with an independent inert gas generator system. Which of the items identified in the options is most likely to be operating continuously when the cargo tanks are full of cargo?
    • Deck seal pump.
    • Scrubber water pump.
    • Combustion air blower.
    • Capacity control valve.

  5. Question 5

    Considering the ullage space of a cargo tank containing petroleum based oil. Which of the given statements best describes the atmosphere of the ullage space?
    • It will contain a mixture of atmospheric air and hydrocarbon gases with an oxygen content greater than 21 % by volume.
    • It will contain a mixture of atmospheric air and hydrocarbon gases with an oxygen content of less than 21 % by volume.
    • It will contain a mixture of atmospheric air and hydrocarbon gases with an oxygen content equal to approximately 21 % by volume.
    • It will contain a layer of hydrocarbon gases and a layer of atmospheric air since the two cannot mix.

Preview — 5 of 70 questions

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About this CBT test

Inert Gas Generator is a CBT test with 70 questions and verified answers. Common topics include: independent inert, oxygen content, pressure vacuum, deck main, cargo tank, generator system, alarm condition, scrubber unit.

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