Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 3, 6
 3, 4, 5
 1, 2, 5
 2, 4, 5, 6

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Electrical Machines
In DC machines, the interpoles are provided

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

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