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CD0048. Gas Measurement

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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 — CD0048. Gas Measurement” contains 65 questions across 1 collection.

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Sample questions and answers

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What is the normally accepted value for the maximum oxygen content in an inerted cargo tank?

One correct answer

  • 8% by volume✓ Correct answer
  • 21% by volume
  • 1% by volume
  • 5% by volume
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?

One correct answer

  • The inerting operation should be stopped for at least 30 minutes before introducing sampling equipment into the tank.✓ Correct answer
  • It is safe to take samples during inerting.
  • The inerting operation should be stopped while samples are obtained.
  • Samples should never be taken from a partly inerted tank.
What simple test can be carried out to check for leaks in a bulb type aspirator pump for a gas detecting instrument?

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
Which material is normally used to remove dirt and moisture from a gas sample prior to entry into a combustible gas indicator?

One correct answer

  • Cotton wool✓ Correct answer
  • Soda lime
  • Cardboard
  • Paper
When calibrating an oxygen analyser which two of the options given should normally be checked?

Multiple correct answers

  • Zero setting✓ Correct answer
  • Span (21% by volume)✓ Correct answer
  • Full scale deflection
  • Span (8% by volume)

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