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For a DC machine, in a commutator ________

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For a DC machine, in a commutator ________

(a) Copper is harder than mica

(b) Mica and copper are equally hard

(c) Mica is harder than copper

(d) Cannot be determined

This question was addressed to me in homework.

My question is taken from Commutation Process in division Commutation Process & Excitation Methods of DC Machines

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The correct choice is (c) Mica is harder than copper

Explanation: Due to its mechanical strength and insulating properties mica is a satisfactory material. However, mica is much harder than the copper segments, so during manufacturing it requires to under-cut the mica by sawing slots between the adjacent segments of the commutator.

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