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CD7032. TOTS 1B-Fixed and Portable Gas Detections Systems

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About this collection

The Seagull CBT bank is organised into modules covering safety, shipboard operations, maintenance and other topics. Original module names and codes are retained to help you find the topic you need.

“Seagull CBT — CD7032. TOTS 1B-Fixed and Portable Gas Detections Systems” contains 36 questions across 1 collection.

Learning

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Sample questions and answers

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What instrument should you use to test for very low levels of oxygen before loading a sensitive cargo?

One correct answer

  • Chemical indicator tubes.✓ Correct answer
  • A paramagnetic oxygen analyser.
  • An Explosimeter.
  • An infrared gas detector.
How will leaks in the sampling line affect the operation of portable gas detection equipment?

One correct answer

  • It will cause lower readings due to dilution of the sample.✓ Correct answer
  • It will cause higher readings due to increased flow rate.
  • It will cause failure due to low suction pressure.
  • It will cause failure due to high flow rate.
If an Explosimeter is calibrated using span gas containing 1% butane in air, what reading may be expected?

One correct answer

  • Approximately 50% Lower Flammable Limit.✓ Correct answer
  • Approximately 10% Lower Flammable Limit.
  • Approximately 100% Lower Flammable Limit.
  • Approximately 1% Lower Flammable Limit.
What is the composition of the span gas generally used for calibration of an Explosimeter?

One correct answer

  • Approximately 1% butane in air.✓ Correct answer
  • Pure carbon dioxide.
  • A proprietary mixture of nitrogen and carbon dioxide.
  • Approximately 40% propane in air.
What effect will inert gas have on the operation of an infrared type gas detector?

One correct answer

  • None. The instrument is not affected by the absence of oxygen.✓ Correct answer
  • It will reduce the reading by contaminating the sensor.
  • Small particles may obscure the mirrors.
  • It will Increase the reading by increasing the temperature of the chamber.

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