Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.
 field current on Y-axis and armature current on X-axis.

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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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