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In a DC generator, the commutator serves as a _________

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In a DC generator, the commutator serves as a _________

(a) mechanical rectifier for alternating EMF to direct EMF

(b) mechanical inverter to invert the direct applied voltage to alternating voltage

(c) all of the mentioned

(d) none of the mentioned

I got this question during an interview.

This intriguing question comes from Constructional Features of Rotating Electrical Machines-3 in portion Constructional Features of Rotating Electrical Machines of Electrical Machines

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The correct option is (a) mechanical rectifier for alternating EMF to direct EMF

Explanation: A DC generator is equivalent to an AC machine plus a mechanical rectifier, i.e, commutator.

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