Exam Question

A 100 kW, 460 V shunt generator was run as a motor on no load at its rated voltage and speed. The total current taken was 9.8 A, including a shunt current of 2.7 A. The resistance of the armature circuit at normal working temperature was 0.11 Ω. Calculate the efficiencies at: (16)

(i) Full load

(ii) Half load.