A 1φ, 3 kVA, 240=120 V, 60 Hz transformer has the following parameters: RHV =0:25 Ω, RLV =0:05 Ω XHV =0:75 Ω, XLV =0:18 Ω.
Determine the voltage regulation when the transformer is supplying full load at 110 V and 0.9 leading power factor.