Two similar 6,600-V, 3-, generators are running in parallel on constant-voltage and frequency busbars. Each has an equivalent resistance and reactance of 0.05 and

Two similar 6,600-V, 3-φ, generators are running in parallel on constant-voltage and frequency busbars. Each has an equivalent resistance and reactance of 0.05 Ω and 0.5 Ω respectively and supplies one half of a total load of 10,000 kW at a lagging p.f. of 0.8, the two machines being similarly excited. If the excitation of one machine be adjusted until the armature current is 438 A and the steam supply to the turbine remains unchanged, find the armature current, the e.m.f. and the p.f. of the other alternator.