Electrical Machines
Cogging and crawling are phenomena associated with

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

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Electrical Machines
Where the shunt generators are widely used?

 Where often load fluctuation is occurred.
 Where the load is very high.
  Where a constant voltage is required over a narrow load range.
 Where voltage variation is needed over a wide load range.

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