Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  eliminate noise.
  none of these.
  balance the rotor dynamically.
  facilitate cooling of rotor.

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Electrical Machines
In DC machines, the interpoles are provided

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

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