Satisfactory commutation of D.C. machines requires
A)brushes should be of proper grade and size
B)brushes should smoothly run in the holders
C)smooth, concentric commutator properly undercut
D)all of the above

Question

Quizplus · Accepted Answer

Satisfactory commutation in DC machines requires that the brushes be of the proper grade and size, smoothly run in their holders, and that the commutator is smooth, concentric, and properly undercut. All these factors contribute to reducing sparking and ensuring efficient current transfer from the commutator to the external circuit.

Satisfactory Commutation of D.C. Machines Requires