Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 zero.
 constant independent of speed.
 proportional to square of rotor speed.

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

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

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