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CD0234. Electric Propulsion, Fundamentals

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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 — CD0234. Electric Propulsion, Fundamentals” contains 36 questions across 1 collection.

Learning

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Sample questions and answers

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Here are the terminal connections on an electric induction motor. Which of the following best describes the arrangement?

One correct answer

  • 3 phase - Delta connected✓ Correct answer
  • 3 phase - Star connected
  • 3 phase - Star connected with insulated neutral
  • 3 phase - Star connected with earthed neutral
Here are the terminal connections on an electrical machine. Which of the following best describes the arrangement?

One correct answer

  • 3 phase - Star connected with neutral✓ Correct answer
  • 3 phase - Delta connected with neutral
  • 4 phase - Star connected
  • 3 phase - Delta connected with split winding
Which of the following best describes one of the major advantages of using 3 phase electricity on a ship rather than single phase?

One correct answer

  • Reduced cable costs✓ Correct answer
  • Reduced number of conductors
  • Reduced number of transformers
  • Reduced maintenance
When used to construct a ‘power triangle’ for an electrical circuit which of the following best describes what is represented by a phasor’s direction?

One correct answer

  • Its phase position with respect to some reference, usually the system voltage✓ Correct answer
  • The value of the quantity being represented
  • The angle of the generator rotor with respect to a reference point
  • Whether the quantity being measured is active or reactive
Which of the following correctly describes what is happening at the instant represented by this phasor diagram?

One correct answer

  • The value of current is zero✓ Correct answer
  • The value of current is falling
  • The current leads the voltage
  • The value of voltage is falling

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