In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
(A) increase
(B) decrease
(C) either of the above
(D) none of the above
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
(A) increase
(B) decrease
(C) either of the above
(D) none of the above
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