Question: A 5 kVA, 2 2 0 / 1 1 0 volts single phase transformer was tested and has following results. At short circuit test with

A 5kVA, 220/110volts single phase transformer was tested and has following results. At
short circuit test with rated input current and the power measured is 120watts. At open
circuit the power measured is 52watts at rated input voltage. Determine a)The efficiency
at 0.8lagging power factor for the following loads:
14of the rated
Rated
1.2of the rated
b)the maximum efficiency

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