Electrical Machines
The three point starter is used for

  Shunt motor.
  Shunt, compound and series motor.
  Series motor.
  Shunt motor as well as compound motors.

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Electrical Machines
In DC machines, the interpoles are provided

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

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