In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except
A)interpoles
B)dummy coils
C)compensating winding
D)shifting of axis of brushes

Question

Quizplus · Accepted Answer

Interpoles, compensating windings, and shifting the axis of brushes are methods used to reduce sparking at the brushes in a DC generator by neutralizing the self-induced e.m.f. in the coil. Dummy coils, however, do not serve this purpose; they are used for other reasons, such as improving commutation but not directly for neutralizing self-induced e.m.f. to reduce sparking.

In a DC Generator in Order to Reduce Sparking at Brushes, the Brushes