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A single phase 10KVA, 3300/400 V transformer has the following winding resistances and reactances r1= 0.7 Ω, r2=0.011 Ω, x1= 3.6 Ω and x2 = 0.045 Ω. The transformer is supplying the load at 0.8 pf lagging. Calculate the voltage regulation and efficiency of transformer (i) at full load, (ii) at half load. Determine the load current at maximum efficiency

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