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The efficiency of a 20 KVA, 2000/200 V, single phase transformer at unity pf is 98%. The given total losses at full load is 200 W. The pu resistance is?

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The efficiency of a 20 KVA, 2000/200 V, single phase transformer at unity pf is 98%. The given total losses at full load is 200 W. The pu resistance is?

(a) 0.01

(b) 0.1

(c) 1.0

(d) 0.0196

The question was posed to me in class test.

My question is from Transformer Losses and Efficiency in portion Transformers of Electrical Machines

1 Answer

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Best answer
The correct choice is (a) 0.01

Best explanation: pu resistance = Ohmic losses/KVA = 200/20000 = 0.01 pu.

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