Electrical Machines
The basic function of a transformer is to change

 the power level
 the level of the voltage
 the frequency
 the power factor

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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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