Question: A 1 0 0 kVA single - phase transformer has an iron loss of 6 0 0 W and a copper loss of 1 .

A 100kVA single-phase transformer has an iron loss of 600W and a copper loss of 1.5kW at full-load current. Calculate the efficiency:
1. At 100kVA output at 0.8 power factor lagging.
2. At 50kVA output at unity powerfactorlagging.

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