Electrical Machines
In DC machines, the interpoles are provided

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = even number.
 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = negative number.

ANSWER DOWNLOAD EXAMIANS APP