Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Fail to start.
  Will results in short circuit.
  Will results in open circuit.
  Nothing will happen.

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

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Electrical Machines
Compensating windings are used in DC generators

  mainly to reduce the eddy currents by providing local short circuit.
None of these
  to provide path for the circulation of cooling air.
  to neutralize the cross magnetizing effect of the armature reaction.

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