Electrical Machines
Which of the following machine will have maximum efficiency?

 DC motor.
 Electrical power generator.
 Induction motor.
  Electrical power transformer.

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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.
 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.

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