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While the operation of dc motor, there are sparkings at the commutation observed. These can be happening due to ________

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While the operation of dc motor, there are sparkings at the commutation observed. These can be happening due to ________

(a) under commutation

(b) over commutation

(c) too rapid reversal of the current

(d) any of the mentioned

I got this question in an interview for internship.

This interesting question is from Action of Commutator in portion Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

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Correct answer is (d) any of the mentioned

Easiest explanation: The over commutation, over commutation or rapid reversal of the current, any of these reasons can lead to sparking at the brushes.

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