Question: A 2 3 - kVA, 2 3 0 0 / 2 3 0 - V , 6 0 - Hz , single - phase transformer

A 23-kVA, 2300/230-V,60-Hz, single-phase transformer with Z1=4+j12&Z2=0.04+j0.12. The transformer is operating at 75% of its rated load and uses 230-V terminal voltage. Determine the efficiency of the transformer if the load is operated at 0.886 lagging.
A 2 3 - kVA, 2 3 0 0 / 2 3 0 - V , 6 0 - Hz ,

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