Electrical Machines
Compensating windings are used in DC generators

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

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Electrical Machines
Which of the following statements is/are correct statements?

 EMF per turn in HV winding is more than EMF per turn in LV winding
All of these
 EMF per turn in both the windings are equal
 EMF per turn in HV winding is less than EMF per turn in LV winding

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

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