The maximum efficiency of a 100 kVA, 1 - phase transformer is 98% and occurs at 80% of full load at 0.8 pf lagging. If leakage reactance of transformer is 5%. The voltage regulation at full load will be (Take power factor = 0.8)
A
2.125%
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B
4.275%
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C
5.673%
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D
3.753%
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Solution
The correct option is D 3.753% Given maximum efficiency of transformer is 98% at 80% of full load at 0.8 p.f lagging.