Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Draw too much current.
 Open fuse or circuit breaker.
 Produce sparking at brushes.
  Develop excessive speed and damage itself.

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

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