Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  an integral multiple of number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  equal to number of rotor slots.

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Electrical Machines
Cogging and crawling are phenomena associated with

 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.
 the former at a fraction of its rate speed and the latter during starting.

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