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7.8 A single-phase, 25 kVA, 2000:200 V rated transformer has iron and full-load copper loss of 350 W and 400 W respectively. Determine the

7.8 A single-phase, 25 kVA, 2000:200 V rated transformer has iron and full-load copper loss of 350 W and 400 W respectively. Determine the efficiency at full- and half-load and at unity power factor.

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