A 230 V shunt generator has an armature circuit resistance of 0.05 ohm and shunt field resistance of 57.5 ohms. When the generator operates at rated voltage it has a total core and mechanical losses of 1880 W. At what load does the generator operate so as to achieve maximum efficiency?

		A. 78.5 kW
		B. 53.51 kW
		C. 50.61 kW
		D. 60.15 kW