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

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

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Electrical Machines
Cogging of induction motor occurs at

 high voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.

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