Electrical Machines
Speed of DC motor can be controlled by varying

 resistance of armature culture.
 all of these.
 its flux oer pole.
 applied voltage.

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Electrical Machines
In DC machines, the interpoles are provided

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

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