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Mark the possible causes of overheating of commutator in a DC machine.

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Mark the possible causes of overheating of commutator in a DC machine.

(a) Overload

(b) Restricted ventilation

(c) Shorted winding

(d) Any of the mentioned

I had been asked this question in exam.

The query is from Efficiency and Testing of DC Machines in section DC Machines of Electrical Machines

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Best answer
The correct choice is (a) Overload

To elaborate: All the factors can cause the overheating of commutator.

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