Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave
 half wave
 half wave controlled
 full wave controlled

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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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