Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = even number.

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

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

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