Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque, operating speed, full load current.
 Starting torque.
 Operating speed.
  Full load current.

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Electrical Machines
In DC machines, the interpoles are provided

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

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