Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of starting winding.

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Electrical Machines
In DC machines, the interpoles are provided

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

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