Electrical Machines
DC Motor

  dc series motor.
  dc compound motor.
  dc shunt with armature resistance control.
  dc shunt motor with field weakening.

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

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