Electrical Machines
In large sized DC machines the compensating windings are provided to

None of these
 reduce eddy current losses by providing local short circuits.
  neutralize voltage induced in coil due to fluctuation of l
 compensate for the decrease in speed due to increase of load.

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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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