Related Question
For synchronous motor,
Under excitation - Lagging power factor
Over excitation - Leading power factor
For synchronous generator
Under excitation - Leading power factor
Over excitation - lagging power factor
Equivalent resistance of the circuit,
Req = (12||18) + 8
Req = 7.2 + 8
Req = 15.2 ohm
Source current = current through 8 ohm resistor, I = Vr/R8
I = 20/8
I = 2.5 A
Supply votage V = I*Req
V = 2.5*15.2
V = 38 V