Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Compound.
 Shunt.
  Separately excited.
  Series.

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

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