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

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

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former at a fraction of its rate speed and the latter during starting.
 cage induction machines and they are essentially the same.
 the former during starting and the latter at a fraction of its rated speed.
 any of the above.

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