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Question

A 400 kVA transformer has core loss of 700 W and a full load copper loss of 2800 W. The maximum efficiency of the transformer at unity power factor will be

A
95.70%
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B
99.30%
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C
98.10%
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D
92.70%
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Solution

The correct option is B 99.30%
For maximum efficiency at unity power factor using condition,
(kVA)m=(kVA)flPiPcu=4007002800
=40014=200 kVA

At maximum efficiency, Pc=Pi

%ηmax=200200+7001000+7001000=99.30%

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