a single phase transformer rated 1.2k/120V, 7.2kVA has the following winding parameters: r1= 0.8 ohm, x1=1.2 ohm, r2= 0.01 ohm and x2=0.01 ohm. determine the supply voltage when it is delivering 7.2 kVA to a load at 120V and 0.8 pf lagging
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