Electrical Machines
In DC machines, the interpoles are provided

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

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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

 Lv on one core limb and hv on the other
 Half hv inside and half lv outside on each core limb
 Half lv inside and half hv outside on each core limb
 Sandwiched lv and hv discs on each core limb

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