A 230/400 V single-phase transformer absorbs 35 W when its primary winding is connected to a 230 V, 50 Hz supply, the secondary being on open circuit. When the primary is short-circuited and a 10 V, 50 Hz supply is connected to the secondary winding, the power absorbed is 48 W when the current has the full-load value of 15 A. Estimate the per unit efficiency of the transformer at half load, 0.8 power-factor lagging.

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A 230/400 V single-phase transformer absorbs 35 W when its primary winding is connected to a 230 V, 50 Hz supply, the secondary being on open circuit. When the primary is short-circuited and a 10 V, 50 Hz supply is connected to the secondary winding, the power absorbed is 48 W when the current has the full-load value of 15 A. Estimate the per unit efficiency of the transformer at half load, 0.8 power-factor lagging.

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