What is the function of the commutator associated with a DC motor?

Correct Answer: Option D — allow current flow in the armature windings under a given pole to be in the same direction at all times

The commutator acts as a mechanical rectifier rotating with the armature. According to IEEE 45 principles, it continuously reverses internal winding connections to ensure current under any given pole flows in the same directional sense, producing unidirectional torque.