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CD0426. Gas measurement, Measuring instruments

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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 — CD0426. Gas measurement, Measuring instruments” contains 28 questions across 1 collection.

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Sample questions and answers

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What is normally used to remove dirt and moisture from a gas sample prior to entry into a combustible gas indicator? Select the ONE correct answer.

One correct answer

  • A cotton filter.✓ Correct answer
  • Soda lime
  • Cardboard
  • A paper filter
Which gas would be most likely to affect the reading from a refractive index type hydrocarbon gas measuring instrument? Select the ONE correct answer.

One correct answer

  • Carbon dioxide✓ Correct answer
  • Oxygen
  • Nitrogen
  • Hydrogen sulphide
What simple test can be carried out to check for leaks in a bulb type aspirator pump for a gas detecting instrument? Select the ONE correct answer.

One correct answer

  • Nip the inlet line after squeezing the bulb to see if it stays deflated✓ Correct answer
  • Nip the outlet line after squeezing the bulb to see if it stays deflated
  • Pressure test the pump with gas from a span test canister
  • Submerge the pump in liquid and check for bubbles as it is operated
When carrying out checks of the atmosphere in a cargo tank following gas freeing, at how many levels in the tank should samples be taken to ensure there are no variations in the tank atmosphere? Select the ONE correct answer.

One correct answer

  • At least three levels✓ Correct answer
  • At least two levels
  • One level is sufficient
  • Samples should be taken every metre depth in the tank.
Which material is recommended for the removal of carbon dioxide from a gas sample when measuring the hydrocarbon gas content of an inerted cargo tank atmosphere with a refractive index or infrared absorption type detector? Select the ONE correct answer.

One correct answer

  • Sodalime✓ Correct answer
  • Cotton wool
  • Silica gel
  • Gauze

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