Q. Zero voltage regulation in a transformer occurs at :

A
zero pt lead
B
unity p.f
C
leading p.f.
D
lagging p.f.
Solution:

At leading power factor the voltage regulation is given by I*(Rcosf- Xsinf). Thus, at a particular condition of angle f we may get zero voltage regulation. While in lagging power factor case we have sign in the above formula

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