Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on X-axis and power factor on Y-axis
 field current on Y-axis and armature current on X-axis
 field current on Y-axis and power factor on X-axis
 field current on X-axis and armature current on Y-axis

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Field winding resistance should be less than critical resistance.
All of these
 Field winding should be properly connected to armature winding.
 Poles should contain residual flux.

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