In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made
A)equal to that of armature mmf
B)less in comparison with the arma¬ture mmf
C)large in comparison with the arma-ture mmf
D)none of the above

Question

Quizplus · Accepted Answer

To prevent excessive distortion of the field form by armature reaction in DC machines, the field mmf must be large in comparison with the armature mmf. This ensures that the overall magnetic field remains stable and effective for the machine's operation, despite the distorting effects of the armature reaction.

In DC Machines, Ir Order to Prevent Excessive Distortion of Field