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CD0425. Gas measurement, A safe atmosphere

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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 — CD0425. Gas measurement, A safe atmosphere” contains 33 questions across 1 collection.

Learning

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Sample questions and answers

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What would be the normal source of information regarding the possible presence of a toxic gas due to the carriage of a particular cargo? Select the ONE correct answer.

One correct answer

  • Material safety data sheet for the cargo (MSDS).✓ Correct answer
  • Code of safe working practices (COSWP).
  • Safety of life at sea (SOLAS).
  • International Safety Guide for Oil Tanker and Terminals (ISGOTT).
According to this module, what is the generally accepted minimum oxygen content that will support combustion? Select the ONE correct answer.

One correct answer

  • 11%✓ Correct answer
  • 16%
  • 8%
  • 21%
Stagnant water, some sewage systems and some oil cargoes can all be the source for a gas which is both flammable and toxic. What is this gas? Select the ONE correct answer.

One correct answer

  • Hydrogen sulphide.✓ Correct answer
  • Nitrogen.
  • Hydrogen chloride.
  • Carbon dioxide.
What is the normally accepted value for the lower explosive limit, LEL, for hydrocarbon gas in a cargo tank? Select the ONE best answer.

One correct answer

  • 1% by volume.✓ Correct answer
  • 21% by volume.
  • 10% by volume.
  • 8% by volume.
What is the effect on the oxygen content of the atmosphere of an enclosed space if hydrocarbon gases are present? Select the ONE correct answer.

One correct answer

  • Oxygen content is reduced.✓ Correct answer
  • No effect.
  • Oxygen content is increased.
  • The effect cannot be determined.

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