Discussion
A transformer can have zero voltage regulation at:
Answer: C
Zero voltage regulation is possible at a Leading power factor.
Approximately, regulation is \(\frac{I(R\cos\phi \pm X\sin\phi)}{V}\), with the plus sign for lagging and the minus sign for leading loads. With a leading power factor the reactive term subtracts, and at the angle where \(R\cos\phi = X\sin\phi\), that is \(\tan\phi = R/X\), the regulation is zero.
At lagging and unity power factor both terms are positive, so the regulation is positive. At zero power factor leading it would be strongly negative, not zero.
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