A. unity
B. lagging
C. leading
D. zero
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A. unity
B. lagging
C. leading
D. zero
The Correct Answer Is C the minimum voltage regulation occurs when the power factor of the load is leading.
The voltage regulation of a transformer is the change in its output terminal voltage which varies due to the load. Maximum voltage regulation occurs when the power factor of the load is lagging, as this is when the power factor angle (tan inverse r/x) is at its highest.
When the load is of a leading power factor, such as a capacitive load, the voltage regulation of the transformer is zero. Approximate voltage regulation formula V.R.=Zp.u. cos θeq−ϕ can be used to calculate the voltage regulation. It states that for maximum voltage regulation, the power factor angle must equal zero. As a result, the minimum voltage regulation occurs when the power factor of the load is leading.