Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field system lost residual magnetism
 field resistance was higher than critical resistance
 field winding was wrongly connected
 there was a break in the armature circuit

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

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