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Mutual flux ______ at the lagging loading and it _____ at the leading power factor.

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Mutual flux ______ at the lagging loading and it _____ at the leading power factor.

(a) decreases, increases

(b) increases, increases

(c) decreases, decreases

(d) increases, decreases

I have been asked this question by my school principal while I was bunking the class.

Query is from Transformer Losses and Efficiency in division Transformers of Electrical Machines

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The correct choice is (a) decreases, increases

Explanation: The mutual flux falls when the transformer is working at lagging p.f. and it increases at leading p.f.

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