Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
  all of above.
  shape of the pole shoe.
 size of air gap.

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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.
  both (B) and (C).
 to counteract the reactance voltage and the cross-magnetizi

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