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## When the load PF is leading the voltage regulation is?

Explanation: At leading power factor the voltage regulation can be **negative or zero**.

The voltage regulation of the transformer is the percentage change in the output voltage from no-load to full-load. And since power factor is a **determining factor in the secondary voltage**, power factor influences voltage regulation. This means the voltage regulation of a transformer is a dynamic, load-dependent number.

## When the load PF is lagging then voltage regulation is positive negative zero may be positive or negative?

Voltage Regulation of Transformer at Lagging Power Factor

For any current that lags the secondary voltage by 0 to 90^{o}, the voltage regulation will **be positive**.

## How does load power factor affect the voltage regulation and transmission line efficiency?

Effect of Load Power Factor on Efficiency

three phase. Or **I = P ÷ 3V _{R}cos φ_{R}**. Thus, for a constant amount of power and voltage at the receiving end, the line current is proportional to the load power factor. … Thus, the efficiency of the transmission line decreases with the decrease in load power factor.

## When the load power factor is leading voltage regulation of line is Mcq?

Explanation: Since voltage regulation of a transformer in the leading loading condition is not additive in nature, at particular power factor in leading we can get **zero voltage regulation**.

Load regulation is **the capability to maintain a constant voltage (or current) level on the output channel of a power supply despite changes** in the supply’s load (such as a change in resistance value connected across the supply output).

## Why regulation is positive for lagging load and negative for leading load?

The ratio (E_{2}-V_{2})/V_{2} is per unit regulation. As load current increases,the voltage drop tends to increase V_{2} and drops more and more. In case of lagging **power factor V _{2}<E_{2}** ,we get positive voltage regulation but in case of leading power factor E

_{2}<V

_{2},we get negative voltage regulation.

## Under which conditions can voltage regulation be positive or negative?

At unity and lagging power factor loads, the terminal voltage is always less than the induced EMF and the voltage regulation **is positive**. At higher leading loads, the terminal voltage is greater than the induced EMF and the voltage regulation is negative.

## Why the voltage regulation is negative in case of capacitive load?

**There is a drop in voltage from no load to full load**. The leading current is provided by the Capacitor. The value of voltage regulation may be negative if the leading angle and sin angle are increased.