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A dc machine is run at rated speed in forward direction and then in backward direction. It is observed that, speeds of the rotation are different, then it leads to the conclusion of _________

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A dc machine is run at rated speed in forward direction and then in backward direction. It is observed that, speeds of the rotation are different, then it leads to the conclusion of _________

(a) incorrect brush placement

(b) incorrect pole and core alignment

(c) incorrect field supply

(d) all of the mentioned

This question was addressed to me in a national level competition.

I need to ask this question from DC Motor Starting in portion DC Motors of Electrical Machines

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Right answer is (a) incorrect brush placement

Easiest explanation: Given at the same speed of operation, if the speeds are different then the brushes are placed in not aligned manner.

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