Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  ohmic losses.
  hysteresis losses.
  mechanical losses.

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop induction generator torque.
  the damper bars develop induction motor torque.
  the damper bars develop synchronous motor torque.
  negative sequence currents are generated.

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