A 40 kVA, 100/400 V, 1-ϕ, 50 Hz transformer has iron loss of 400 W an – McqOptions

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1.	A 40 kVA, 100/400 V, 1-ϕ, 50 Hz transformer has iron loss of 400 W and copper loss of 1600 W at full load. What is the efficiency of the transformer at half load with 0.8 power factor lagging?
A.	95.2 %
B.	86.6 %
C.	99.1 %
D.	90.8 %
Answer» B. 86.6 %

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