Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 electromechanical energy conversion
 generation of voltage
 commutation
 development of torque

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Electrical Machines
In a 3 - Φ induction motor

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

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