Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Any of above.
 Armature circuit resistance control.
 Armature voltage control.
 Field resistance control.

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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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