The surface of the commutator is ______.

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Multiple Choice

The surface of the commutator is ______.

Explanation:
The surface finish of a commutator should be smooth to ensure reliable brush contact. Carbon brushes ride on this surface to transfer current, so any roughness, tool marks, or pits can cause uneven contact, higher resistance, sparking, and accelerated wear. A smooth surface provides a consistent, uniform contact as the rotor turns, which is the key requirement for proper commutation. Shine or polish isn’t needed as the essential quality is the absence of roughness; an evenly flat surface helps, but smoothness directly describes the brush-contact behavior.

The surface finish of a commutator should be smooth to ensure reliable brush contact. Carbon brushes ride on this surface to transfer current, so any roughness, tool marks, or pits can cause uneven contact, higher resistance, sparking, and accelerated wear. A smooth surface provides a consistent, uniform contact as the rotor turns, which is the key requirement for proper commutation. Shine or polish isn’t needed as the essential quality is the absence of roughness; an evenly flat surface helps, but smoothness directly describes the brush-contact behavior.

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