Electrical Machines
In DC machines, the interpoles are provided

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

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Electrical Machines
Which of the following represents the commutator pitch?

 Number of conductors spanned by one coil at the front end of the armature.
 Number of commutator segments between two successive coils.
 The distance between the staring of first coil and its next successive coil
 Number of conductors spanned by one coil at the back end of the armature.

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