Electrical Machines
Under commutation results in

  sparking at the leading edge of the brush.
  no sparking.
  sparking at the middle of the brush.
  sparking the trailing edge of the brush.

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

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

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