Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  armature resistance, effect of armature reaction.
  reduction in field current, effect of armature reaction, armature.
 armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.

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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.
 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.

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