Electrical Machines
Cogging and crawling are phenomena associated with

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

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Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.
  triangular space distribution and rotates at the speed of armature.
  trapezoidal space distribution and is stationary in space.

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