Electrical Machines
Cogging and crawling are phenomena associated with

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

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
  rotating with respect to field poles as well as armature.
  stationary with respect to armature.
 rotating with respect to field poles.

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