Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  rotor winding.
  either stator winding or rotor winding.
  stator winding.
None of these

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Electrical Machines
In DC machines, the interpoles are provided

  both (B) and (C).
 to counteract demagnetizing effect of armature mmf in commutating zone.
 to counteract the reactance voltage and the cross-magnetizi
  to make commutation spark less.

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