Question

Can the voltage regulation, which is proportional to$\left(V_{RNL}-V_{RFL}\right)$, be negative?

(a) Yes

(b) No

Short answer

Therefore, the correct option is (a) yes.

Step-by-step solution

Determine the formula of voltage regulation.

Write the formula of voltage regulation.

${\mathit{V}}_{\mathbf{R}}\mathbf{=}\frac{\left(V_{RNL}-V_{RFL}\right)}{{\mathbf{V}}_{\mathbf{R}\mathbf{F}\mathbf{L}}}$……. (1)

Here, $V_{RNL}$ is a no-load voltage and $V_{RFL}$ is a full load voltage.

Determine the correct option.

By the phasor diagram, for a lagging power factor, the voltage regulation is positive.

But, for leading power factor, the voltage$V_{RFL}$exceeds $V_{RNL}$ by certain angle, hence voltageregulation is negative.

Hence, the voltage regulation can be negative.

Therefore, the correct option is (a) yes.