Question: 8 . 9 . An 1 1 , 0 0 0 / 2 3 0 - V , 1 5 0 - kVA, 5 0

8.9.An 11,000/230-V,150-kVA, 50-Hz,1-phase transformer has a core loss of 1.4 kW and full-load Cu loss of 1.6 kW. Determine (a) the kVA load for maximum efficiency and the minmum efficiency (b)the efficiency at half full-load at 0.8 power factor lagging.[140.33 kVA, 97.6% ; 97%]

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