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CD0231. High Voltage, Ship's electrical networks

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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 — CD0231. High Voltage, Ship's electrical networks” contains 35 questions across 1 collection.

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Sample questions and answers

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Which one of the following best describes why the overall system power factor is important when operating electrical generators on a ship?

One correct answer

  • It determines the total current that the generators must produce for a given active power✓ Correct answer
  • It determines the kilowatt load on the generators
  • It determines the fuel consumption of generators
  • The overall system power factor cannot safely exceed 0.95
Which one of the following best describes why physical forces can be created from the interaction of 2 magnets?

One correct answer

  • The magnets move to make the lines of magnetic flux as short as possible✓ Correct answer
  • The magnets move because of an electrical charge stored within them
  • The magnets move to even out the flux density
  • The magnets move if the lines of magnetic flux are forced to cross
High voltage ships tend to use earthed neutral electrical networks. Which one of the following best describes how excessive fault currents are prevented in the event of an earth fault on these ships?

One correct answer

  • An impedance is placed in the neutral earthing line✓ Correct answer
  • The risk of earth faults is reduced by extra planned maintenance
  • Earth leakage circuit breakers are used on every circuit
  • An impedance is placed in each output cable from the generators
The kilowatt load on the ship’s only running generator is steady but the power factor meter shows a fall from 0.9 to 0.75. Which one of the following best describes the risk that this change in power factor poses for the ship’s electrical network?

One correct answer

  • The increase in apparent power may cause an overcurrent trip to operate✓ Correct answer
  • The fuel consumption of the generator will be increased and the fuel could run out before arrival in port
  • The decrease in reactive power could cause supply cables to get hotter
  • The galley stove might burn out
Which one of the following options best describes why each feed normally leaves the section boards in a ship’s electrical network via some form of isolation?

One correct answer

  • To allow for maintenance on the circuit✓ Correct answer
  • To allow motors to be stopped remotely
  • To allow lights to be switched off remotely
  • To protect against slow overloads

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