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CD0236. Electric Propulsion, Power electronics

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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 — CD0236. Electric Propulsion, Power electronics” contains 38 questions across 1 collection.

Learning

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Sample questions and answers

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An inverter circuit is used to supply a fan motor with a 3 phase waveform. What is the main reason for inverting the supply to a motor like this?

One correct answer

  • The adjustable switching rate can be used to control the speed of the motor.✓ Correct answer
  • The adjustable switching rate can be used to control the voltage to the motor.
  • The adjustable switching rate can be used to improve the power factor.
  • It is hard to find DC motors with enough power.
If a three phase AC supply is to be full wave rectified to DC what is the minimum number of thyristors (or equivalent) that will be required?

One correct answer

  • 6✓ Correct answer
  • 12
  • 9
  • 3
Which of the following best describes what may happen if a diode is not efficiently cooled?

One correct answer

  • Differential rates of expansion may damage the bond between the P-N junction and the external metal terminals.✓ Correct answer
  • The resistance of the diode will increase.
  • The hysteresis losses will be increased.
  • The inductance of the diode will increase leading to the power factor worsening.
When talking about electrical motor control systems the PWM control method is often mentioned. What does PWM stand for?

One correct answer

  • Pulse Width Modulation.✓ Correct answer
  • Pulse Wave Modulation.
  • Proton Wave Modification.
  • Power Wave Modulation.
Which of the following best describes why an inductance is often fitted to the DC link between a rectifier circuit and an inverter circuit?

One correct answer

  • It helps to smooth the supply of current to the inverter.✓ Correct answer
  • It reverses the polarity of the DC power.
  • It is used to tune out harmonics in the supply.
  • It is used to improve the power factor.

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