Electrical Machines
In a 3 - Φ induction motor

  none of them.
  power factor at starting is low as compared to that while running.
  power factor at starting in the same as that while running.
  power factor at starting is high as compared to that while running.

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

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