Electrical Machines
Compensating windings are used in DC generators

  to provide path for the circulation of cooling air.
  to neutralize the cross magnetizing effect of the armature reaction.
None of these
  mainly to reduce the eddy currents by providing local short circuit.

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

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

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