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EO6-Operate Alternators and Generators

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About this collection

Videotel questions are grouped by professional topic, including machinery, electrical equipment, fuel and ballast operations. Choose a subject relevant to your preparation.

“Видеотел — Engine Category — EO6-Operate Alternators and Generators” contains 172 questions across 1 collection.

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What information would you find on the name plate of any industrial transformer.The source image is unavailable.

One correct answer

  • 1) Power, current, horsepower, ampereage.
  • 2) Power, voltage, transformation rate, impedance.
  • 3) Polarity marking, kVA, impedance, voltages, maker.
  • 4) kVAR rating, voltage, impedance, BIL rating, polarity.✓ Correct answer
How can you monitor the correct instant for synchronising alternators should your synchronising system (synchronoscope or lamps) be defective ?The source image is unavailable.

One correct answer

  • 1) By fitting a voltmeter over one phase.✓ Correct answer
  • 2) By fitting lamps over the three phases.
  • 3) By fitting lamps crossed over two phases.
  • 4) By fitting two voltmeters crossed over two phases.
Which are the two requirements to make electricity generation possible ?The source image is unavailable.

One correct answer

  • 1) Presence of magnetic flux, relative motion between conductor and flux.✓ Correct answer
  • 2) Current to induce flux, rotary movement.
  • 3) Power to induce magnetic flux, power to rotate.
  • 4) Current to induce flux, conductor motion cutting flux.
What are ideal conditions for taking Megger test readings of an alternator?The source image is unavailable.

One correct answer

  • 1) Hot after stopping.✓ Correct answer
  • 2) Cooled down to hand-warm.
  • 3) Cooled down to ambient temperature.
  • 4) Running.
If a total short circuit occurs on a 3 phase alternator and the short-circuit trip fails to operate, what back-up safety device will activate ?The source image is unavailable.

One correct answer

  • 1) The preferential trip.
  • 2) The low frequency trip.
  • 3) The overspeed trip.
  • 4) The under voltage trip.✓ Correct answer

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