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The drop in the voltage for which of the following types of brush can be expected to be least?

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The drop in the voltage for which of the following types of brush can be expected to be least?

(a) Graphite brushes

(b) Carbon brushes

(c) Metal graphite brushes

(d) Cannot be determined

This question was addressed to me in final exam.

Origin of the question is Brushes and Commutator Assembly topic in chapter DC Machines of DC Machines

1 Answer

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Best answer
The correct choice is (c) Metal graphite brushes

For explanation I would say: Metal graphite brushes are ideal for a variety of applications because of their low resistivity. Thus, drop will be less in metal graphite brushes. Metal graphite brushes are used on commutators of plating generators where low voltage and high brush current densities are encountered.

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