Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 armature winding
 field winding
 interpole winding

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Electrical Machines
In a 3 - Φ induction motor

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

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