Electrical Machines
DC Motor

  dc shunt motor with field weakening.
  dc series motor.
  dc shunt with armature resistance control.
  dc compound motor.

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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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