Electrical Machines
In synchronous generator V curve is drawn between

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

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Electrical Machines
Where the shunt generators are widely used?

 Where voltage variation is needed over a wide load range.
  Where a constant voltage is required over a narrow load range.
 Where the load is very high.
 Where often load fluctuation is occurred.

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