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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  vibrations.
  over excitation.
  heating.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor run
 Resistance split phase
 Shaded pole
 Capacitor start

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 48.5Hz
 2.5Hz
 1.5Hz
 51.5Hz

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Electrical Machines
If the excitation is reduced, the power factor is

 leading power factor
 unity power factor
 lagging power factor
None of these

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
 0.7.
  1.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  none of these.
  modified.
  increased.
  reversed.

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MORE MCQ ON Electrical Machines

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