Electrical Machines
A simple method of increasing the voltage of a DC generator is to

  increase the speed of shaft rotation.
 increase the number of turns in armature coil.
 increase the number of turns in field coil.
 increase the source frequency.

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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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