Electrical Machines
Cogging and crawling are phenomena associated with

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

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Electrical Machines
In a DC generator, the armature reaction results in

 magnetization of leading and demagnetization of trailing pole tip.
 demagnetization of centers of poles.
  magnetization of inter poles.
  demagnetization of leading & magnetization of trailing pole tip.

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