The primary and secondary windings of a 40 kVA, 6600/250 V single-phase two-winding transformer have resistances of 10 Ω and 0.02 Ω, respectively. The leakage reactance of the transformer referred to the primary is 35 Ω.  Calculate the percent full-load regulation at unity power-factor. Neglect the no-load current

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The primary and secondary windings of a 40 kVA, 6600/250 V single-phase two-winding transformer have resistances of 10 Ω and 0.02 Ω, respectively. The leakage reactance of the transformer referred to the primary is 35 Ω.  Calculate the percent full-load regulation at unity power-factor. Neglect the no-load current. Give your answer correct to three decimal places

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