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CD7014. TOTS 1A-Fixed and Portable Gas Detec. 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 — CD7014. TOTS 1A-Fixed and Portable Gas Detec. Systems” contains 36 questions across 1 collection.

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Sample questions and answers

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What property of oxygen is utilised in a paramagnetic oxygen analyser?

One correct answer

  • Oxygen is strongly attracted to a magnetic pole.✓ Correct answer
  • The electrical resistance of oxygen changes in a magnetic field.
  • Oxygen molecules will break up in a magnetic field.
  • The strength of a magnetic field is reduced in the presence of oxygen.
When starting to test a sample using a Combustible Gas Indicator (Explosimeter), the needle immediately flicks to maximum deflection, then returns to zero. What is indicated?

One correct answer

  • That the flammable gas concentration is above the Lower Flammable Limit.✓ Correct answer
  • That the battery is incorrectly fitted.
  • That the instrument was not warmed up, but is now working correctly.
  • That the sensor element has been contaminated by toxic gas.
When changing high purity cargo grades, what instrument should be used to ensure that tanks are free of the previous product?

One correct answer

  • Chemical indicator tubes.✓ Correct answer
  • A tankscope.
  • An Explosimeter.
  • An infrared gas detector.
What will be the effect of hydrogen sulphide on the reading shown on a Combustible Gas Indicator (Explosimeter)?

One correct answer

  • It will reduce the reading by contaminating the sensor.✓ Correct answer
  • It will give a zero reading by destroying the sensor.
  • It will increase the reading by raising the sensitivity of the sensor.
  • It will have no effect because it is non-flammable.
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.

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