Electrical Machines
The working principle of transformer depends on

 Newtons law.
 Coulombs law.
 Faradays law of electromagnetic induction.
 Amperes law.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In DC machines, the interpoles are provided

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

ANSWER DOWNLOAD EXAMIANS APP