Electrical Machines
In a DC compound motor the field regulator is provided to

 limit the armature current.
 control the armature flux.
 control the field flux.
 demagnetize the field partially.

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

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

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