Question

A transformer has no-load voltage of 220 V and full-load voltage of 210 V. Find voltage regulation.

• A. 4.76%
• B. 2.04%
• C. 3.15%
• D. 1.06%

Hint:

Voltage Regulation = \( \frac{V_{NL} - V_{FL}}{V_{FL}} \times 100 \). Use full-load as denominator!

Answer 1

The Correct Option is A

Step 1: Use Voltage Regulation Formula
\[ VR(%) = \frac{V_{NL} - V_{FL}}{V_{FL}} \times 100 \] Step 2: Plug in Values
\[ VR = \frac{220 - 210}{210} \times 100 = \frac{10}{210} \times 100 \approx 4.76% \] Conclusion:
Option (1) is correct — voltage regulation is 4.76%.