Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
  proportional to rotor speed.
 zero.
 constant independent of speed.

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Electrical Machines
Cogging in induction motor occurs when

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

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