Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  synchronous motor torque.
  induction motor torque.
  induction generator torque.

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

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