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

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

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Electrical Machines
In a star - delta starting of an IM

  resistance is inserted in the rotor.
  applied voltage per stator phase is 57.7 % of a line volt
  line voltage is 57.7 % of stator voltage.
  reduced voltage is applied to the stator.

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