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A 200/400 V single phase transformer has leakage impedance z= r+jx. Then we can expect zero voltage regulation at power factor of ___________

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A 200/400 V single phase transformer has leakage impedance z= r+jx. Then we can expect zero voltage regulation at power factor of ___________

(a) x/r leading

(b) x/r lagging

(c) r/x leading

(d) r/x lagging

This question was posed to me in an online interview.

This interesting question is from Voltage Regulation of Transformer topic in portion Transformers of Electrical Machines

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Right option is (a) x/r leading

The best I can explain: ZVR occurs at the leading pf of load at x/r.

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