Electrical Machines
Flashing the field of DC generator means

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

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

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