Electrical Machines
The armature of a DC motor is laminated to reduce

 copper loss.
 eddy current loss.
 hysteresis loss.
 friction and windage loss.

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Electrical Machines
Flashing the field of DC generator means

  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.
 increasing flux density by adding extra turns of winding.
  neutralising residual magnetism.

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

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