a single phase 10kVA, 2400/120 V transformer has the following equivalent measurements (referenced to high side): Rc 64k ohms, Xm 9.6k ohms, Re 19.3 ohms, Xe 73.3 ohms.
if the secondary load is Zl = 5 angle 30 degrees ohms
a) what is the transformer efficiency when output voltage is 120V?
b) what is the voltage regulation with the above load?