Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  (1 / 5) times the synchronous speed.
 5 times the synchronous speed.
 (1 / 15) times the synchronous speed.
  0.5 times the synchronous speed.

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 voltage ratio of all transformers must be same.
  polarities of all transformers must be same.
 percentage impedance of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  power factor at starting in the same as that while running.
  none of them.
  power factor at starting is low as compared to that while running.

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