Discussion
Assertion (A): A fixed brush shift cannot serve a machine running in both directions.
Reason (R): The neutral axis shifts forward in one direction and backward in the other.
Select the correct option.
Answer: A
A shift that is right for one direction is doubly wrong for the other, since it then adds to the error instead of correcting it. Interpoles reverse with the current and are correct in both, which is why they are universal.
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