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If pole arc is less than pole pitch, a compensating winding will have ampere-turns _________ (compare to peak ampere turns).

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If pole arc is less than pole pitch, a compensating winding will have ampere-turns _________ (compare to peak ampere turns).

(a) Less

(b) Equal

(c) More

(d) Can’t be specified

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Question is from Ways to Reduce Effects of Armature Reaction topic in portion Armature Reaction of DC Machines

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Correct choice is (a) Less

The explanation: The ampere-turns required for compensating winding in a DC machine is ATcw /pole = ATa (peak) *(pole arc/pole pitch) = [IaZ/(AP2)] * (pole arc/pole pitch). Thus, if compensating winding ampere turns are less then, pole arc is smaller than pole pitch and vice-versa.

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