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The voltage drop at brush-commutator contact is variable (1-2V) and dependent of armature current.

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The voltage drop at brush-commutator contact is variable (1-2V) and dependent of armature current.

(a) True

(b) False

I have been asked this question in an interview for job.

I'd like to ask this question from Circuit Model of DC Machines in chapter DC Machines of Electrical Machines

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Right answer is (b) False

For explanation: The voltage drop at brush-commutator contact is variable (1-2V) and independent of armature current.

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