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Gas Measurement, Measuring Instruments

CBT 28 questions

First 5 of 28 questions — with answers

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  1. Question 1

    A sampling pump for an oxygen analyser has a capacity of 100 ml per stroke. It is connected to a 10 metre sampling line with a capacity of 25 ml per metre. What is the minimum number of strokes of the pump needed to obtain a representative sample? Select the ONE correct answer.
    • 2.
    • 4.
    • 10.
    • 25.

  2. Question 2

    For common hazardous gases like hydrogen sulphide, what is the main advantage of using a personal gas monitor rather than a long term gas detector tube when working in a potentially hazardous space? Select the ONE correct answer.
    • The personal monitor can be used to check total exposure throughout the working period.
    • The personal monitor will give an alarm if the exposure limits are exceeded.
    • The personal monitor can be used to obtain a time weighted average.
    • The personal monitor can check for any hazardous gas.

  3. Question 3

    How is a Time Weighted Average reading obtained from a diffusion type detector tube that has been used over a working period of eight hours? Select the ONE correct answer.
    • Divide the total reading on the tube by 8.
    • Half the reading on the tube to get a mid point reading.
    • Multiply the total reading on the tube by 8.
    • Take a direct total reading from the tube.

  4. Question 4

    How is the correct volume of the sample controlled when using short term gas detector tubes with a manually operated hand pump? Select the ONE best answer.
    • By always operating the pump for the same period of time for each tube.
    • By always using a fixed number of complete strokes of the pump for each tube.
    • By checking how many complete pump strokes are required for that particular tube.
    • By always using a single complete stroke of the pump for each tube.

  5. Question 5

    It is generally recommended that non metallic sampling lines and sensors are used when obtaining gas samples from cargo tanks. What additional precautions are required when taking samples during inerting of a cargo tank? Select the ONE best answer.
    • The inerting operation should be stopped for at least 30 minutes before introducing sampling equipment into the tank.
    • It is safe to take samples during inerting.
    • Samples should never be taken from a partly inerted tank.
    • The inerting operation should be stopped while samples are obtained.

Preview — 5 of 28 questions

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About this CBT test

Gas Measurement, Measuring Instruments is a CBT test with 28 questions and verified answers. Common topics include: oxygen analyser, cargo tank, combustible hydrocarbon, gas, sample, detector, instrument, content.

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