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TOTS 1C-Fixed and Portable Gas Detections Systems

CBT 56 questions

First 5 of 56 questions — with answers

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

  1. Question 1

    A fixed combustible gas detection system can only detect a limited range of substances. What are these substances?
    • Hydrocarbon gases up to the Lower Flammable Limit.
    • Chemical gases up to 100 %.
    • Oxygen content up to 21 %.
    • Smoke and combustion products.

  2. Question 2

    A fixed combustible gas detection system should not be used to assess compartments for entry purposes. Why not?
    • Because it does not give an accurate enough reading.
    • Because it does not indicate the oxygen content or the presence of toxic gases.
    • Because many spaces are being monitored, and the origin of the sample is not certain.
    • Since the sample takes some time to pass through the system, the reading may not be current.

  3. Question 3

    After washing and gas-freeing from a toxic cargo, what type of gas detection equipment should you use before entering a cargo tank?
    • A tankscope.
    • An Explosimeter.
    • An infrared gas detector.
    • Chemical indicator tubes.

  4. Question 4

    An Explosimeter cannot be used in an inerted atmosphere. Why not?
    • Because small particles will clog the filters.
    • Because adequate oxygen is required for combustion of the filament.
    • Because the inert gas poisons the filament.
    • Because the presence of carbon dioxide will increase the readings.

  5. Question 5

    Cotton filters are sometimes used with hydrocarbon gas detectors. What is their purpose?
    • To remove water from the sample.
    • To prevent chemical contamination of the sample.
    • To remove dust from the sample.
    • To stop pressure surges in the sample line.

Preview — 5 of 56 questions

You are seeing the first 5 questions with answers. Unlock the remaining 51 to study the whole test — online or offline.

About this CBT test

TOTS 1C-Fixed and Portable Gas Detections Systems is a CBT test with 56 questions and verified answers. Common topics include: detection system, oxygen analyser, operational tests, effect inert, chemical absorption, indicator explosimeter, range flammable, gas.

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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