A 100-kW, 230-V, dc shunt generator, with Ra = 0.05 Ω, and Rf = 57.5 Ω has no-load rotational loss (friction, wind age, and core loss) of 1.8 kW. Compute:
(a) The generator efficiency at full load.
(b) The horsepower output from the prime mover to drive the generator at this load.