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TOTS 1A-Cargo Gas Flammability Diagram

CBT 44 questions

First 5 of 44 questions — with answers

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  1. Question 1

    A gas turbine with afterburner will produce similar inert gas to an independent inert gas generator. What level of oxygen might typically be delivered?
    • 1,5-2,5 % by volume.
    • 5 % by volume.
    • 8-10 % by volume.
    • Approximately 12 % by volume.

  2. Question 2

    After inerting a cargo tank, the oxygen content was found to be 7,5 %, and the hydrocarbon gas content 2 %. Using the Flammability Diagram, would you consider the tank to be safely inerted before gas freeing?
    • No, inerting must be continued.
    • No, the tank atmosphere is in the Flammable Range.
    • Yes, the atmosphere is below the critical dilution line.
    • Yes, the tank atmosphere would remain too rich to support combustion.

  3. Question 3

    Define the «Lower Flammable Limit» of a hydrocarbon gas?
    • It is the gas concentration above which there is not sufficient air to support and propagate combustion.
    • It is the gas concentration below which there is not sufficient gas to support and propagate combustion.
    • It is the gas concentration above which there is too much gas to support and propagate combustion.
    • It is the gas concentration below which there is not sufficient oxygen to support and propagate combustion.

  4. Question 4

    Define the «Upper Flammable Limit» of a hydrocarbon gas?
    • It is the gas concentration above which there is too much oxygen to support and propagate combustion.
    • It is the gas concentration below which there is not sufficient gas to support and propagate combustion.
    • It is the gas concentration above which there is not sufficient air to support and propagate combustion.
    • It is the gas concentration below which there is not sufficient oxygen to support and propagate combustion.

  5. Question 5

    Explain how very cold weather conditions can cause over-pressurisation of cargo tanks?
    • Ice could form on the vents, or the P/V or high velocity vent valves could freeze.
    • Cold weather may cause malfunctioning of cargo monitoring equipment, including pressure monitors.
    • Low temperatures will increase the viscosity of the cargo, and may make it unpumpable.
    • The increased density of the cargo could lead to overloading.

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About this CBT test

TOTS 1A-Cargo Gas Flammability Diagram is a CBT test with 44 questions and verified answers. Common topics include: cargo tank, flammability diagram, oxygen content, flammable limit, relative density, atmosphere point, characteristics vapours, dilution method.

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