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CD0237. Electric Propulsion, Systems for ships

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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 — CD0237. Electric Propulsion, Systems for ships” contains 40 questions across 1 collection.

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Sample questions and answers

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Which one of the following best describes the output from a typical electric propulsion synchroconverter?

One correct answer

  • It will be AC with variable frequency and voltage✓ Correct answer
  • It will be AC with variable frequency only
  • It will be AC with variable voltage only
  • The output will be DC
Which one of the following motor types would you expect to find used with a synchroconverter for speed control?

One correct answer

  • A synchronous AC machine✓ Correct answer
  • An asynchronous AC machine
  • An asynchronous DC machine
  • An induction motor
Which of the following best describes a common way of preventing low order harmonics in an electric propulsion systems?

One correct answer

  • Use half motors and phase shifting transformers to increase the pulse number✓ Correct answer
  • Use a variable pulse number control system
  • Use twisted pair cables
  • Enclose all propulsion control gear in an earthed metal box
Which one of the following best describes why electric propulsion is becoming popular for LNG carriers?

One correct answer

  • The associated generating capacity can be used for cargo pumping or reliquefaction✓ Correct answer
  • LNG boil off cannot be burned in direct drive diesel engines
  • The ability to fit azimuth propulsors aids manoeuvrability
  • Electric propulsion is more efficient than geared propulsion when used with steam turbines
Which of the following best describes how the output frequency of a PWM controller suitable for electric propulsion is varied?

One correct answer

  • The interval between pulses that allow conduction is varied✓ Correct answer
  • The width of the pulses that allow conduction is varied
  • The height of the pulses that allow conduction is varied
  • The DC voltage level is varied

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