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A 200/400 V single phase transformer has leakage impedance z= r+jx. Then we can expect magnitude of load pf of ____ at zero voltage regulation.

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A 200/400 V single phase transformer has leakage impedance z= r+jx. Then we can expect magnitude of load pf of ____ at zero voltage regulation.

(a) cosθ = x/z

(b) cosθ = r/z

(c) cosθ = x/r

(d) cosθ = r/x

This question was posed to me in final exam.

My query is from Voltage Regulation of Transformer in chapter Transformers of Electrical Machines

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The correct choice is (a) cosθ = x/z

The best I can explain: Cosθ = x/z for the transformer at zero V.R.

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