GATE IN concept:efficiency PYQs & Answers

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Topic practice 2 questionsPage 1 of 1

A 50 kVA transformer has an efficiency of 95% at full load and unity power factor. Assume the core losses are negligible. The efficiency of the transformer at 75% of the full load and 0.8 power factor is ________ % (rounded off to one decimal place).

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A single-phase transformer has maximum efficiency of 98%. The core losses are 80 W and the equivalent winding resistance as seen from the primary side is 0.5

. The rated current on the primary side is 25 A. The percentage of the rated input current at which the maximum efficiency occurs is

Your answerChoose one option.

35.7%

50.6%

80.5%

100%

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GATE IN concept:efficiency PYQs

How to practice concept:efficiency

Question 61

Question 27