Electrical Machines
Which motor used in Lathe machine?

  D.C. cumulative compound motor.
None of these
  D.C . series motor.
  D.C. shunt 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.
 Field winding resistance should be less than critical resistance.
 Poles should contain residual flux.
All of these

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Electrical Machines
Cogging of induction motor occurs at

 high voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are not equal.

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