Question

In a DC machine, average energy stored in the magnetic field remains constant independent of the armature rotation.

(a) True

(b) False

This question was addressed to me in an interview.

I would like to ask this question from EMF and Torque Production in division Circuit Model, Emf and Torque of DC Machines

Answer 1

Right choice is (a) True

The best I can explain: In a DC machine, barring the irrecoverable losses of both electric and magnetic origin, there is balance between electrical and mechanical powers of the machine; the average energy stored in the magnetic field remains constant irrespective of armature rotation.