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CD0235. Electric Propulsion, Electrical machines

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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 — CD0235. Electric Propulsion, Electrical machines” contains 42 questions across 1 collection.

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Sample questions and answers

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Which of the following best describes how a solenoid works?

One correct answer

  • A current in the coil produces a magnetic field which moves an iron rod✓ Correct answer
  • A current in the coil produces a magnetic field which moves a copper rod
  • A current in the coil induces an opposing current in an iron rod
  • A current in the central rod overcomes the permanent magnetic field around it
Which of the following best describes the main difference in the construction between a 3 phase and a single phase AC generator

One correct answer

  • The 3 phase generator has 3 pairs of stator coils and the single phase generator only 1 pair✓ Correct answer
  • The single phase generator has 3 pairs of rotor coils and the 3 phase generator only 1 pair
  • The 3 phase generator has no commutator and the single phase generator does
  • The single phase generator has no commutator and the 3 phase generator does
Which of the following best describes how 3 phase electricity can be produced from a diesel generator?

One correct answer

  • We need at least 3 coils, so there are 3 outputs✓ Correct answer
  • We need at least 6 coils, so there are 6 outputs
  • We need at least 6 coils, so there are 12 terminals
  • We need only 1 coil, and the output can be split using thyristors
Which of the following best describes why the rotor of an asynchronous electric motor can never rotate at synchronous speed?

One correct answer

  • At synchronous speed the rotor would feel no change in stator flux and so would produce no current to make its own field✓ Correct answer
  • The rotor construction is not strong enough to stand running at synchronous speed
  • The number of pole pairs in an asynchronous motor is different in the rotor and stator so their synchronous speeds are always different
  • The rotor can reach synchronous speed but will lag behind the stator position
Which one of the following best describes what is between the segments of a DC machine’s commutator?

One correct answer

  • Insulation✓ Correct answer
  • Glue
  • A groove cut in the solid commutator
  • A wear down sensor

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