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Two single phase transformers A and B are operating in parallel having different impedance and identical x/r ratio. Also impedance of A is more than that of B, then?

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Two single phase transformers A and B are operating in parallel having different impedance and identical x/r ratio. Also impedance of A is more than that of B, then?

(a) Za/Zb  = Sb/Sa

(b) Za/Zb  = Sa/Sb

(c) Za/Zb  = 1

(d) Za/Zb  = (Sb/Sa)^2

I have been asked this question by my college professor while I was bunking the class.

The doubt is from Parallel Operation of Single Phase Transformers in chapter Transformers of Electrical Machines

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Correct answer is (a) Za/Zb  = Sb/Sa

Easiest explanation: Leakage impedance in ‘ohms’ are inverse ratio of their respective kVA ratings.

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