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A 10-kVA, 250 / 100-V, 50-Hz single-phase transformer gave the following open and short circuit test...

A 10-kVA, 250 / 100-V, 50-Hz single-phase transformer gave the following open and short circuit test results:
Open circuit test: 250 V, 2.6 A, power factor: 0.3 on HV side.
Short circuit test: 18 V, 80 A, input power: 240 W on HV side.
Calculate the following:
4.1 The equivalent circuit parameters of the transformer. (6)
4.2 The efficiency at full load unity power factor. (NB the test current is not at full load) (6)
4.3 The load at which maximum efficiency occurs (4)
4.4 The maximum efficiency at unity power factor (2)
4.5 The voltage regulation for a lagging power factor of 0.8

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