Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  are provided in a synchronous motor to make it self starting.
  both (A) and (B).
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided on the stator for improving power factor.

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

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

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