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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Q. 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

(D) all of the mentioned

Correct : Option (A)

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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