Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings
 increase the acceleration of commutation
 reduce the overall weight

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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, inter poles, armature.
 armature resistance, effect of armature reaction.
  armature resistance, effect of armature reaction.

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