The following results were obtained on a 50 kVA transformer.  Open circuit test -  primary voltage, 3300 V; secondary voltage, 400 V; primary power, 450 W.    Short-circuit test -  primary voltage, 124 V; primary current, 15.3 A; primary power, 550 W; secondary current, full-load value.    Calculate the efficiencies at full load and at half load for 0.8 power factor.

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The following results were obtained on a 50 kVA transformer. 

Open circuit test - 

primary voltage, 3300 V; secondary voltage, 400 V; primary power, 450 W. 

 

Short-circuit test -

 primary voltage, 124 V; primary current, 15.3 A; primary power, 550 W; secondary current, full-load value. 

 

Calculate the efficiencies at full load and at half load for 0.8 power factor.

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