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.
  induction generator torque.
  synchronous motor torque.
  induction motor 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 = even number.
 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = odd number.

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

 The motor will run much faster in the same direction.
  The motor will run at its normal speed in the same direction as before.
 The motor will stop.
 The direction of rotation will reverse.

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