Electrical Machines
In a DC machine

 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.
 current and emf in armature are alternating.
 current and emf in armature are unidirectional

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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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