Question

A 230V motor, which normally develops l0 kW at 1000 rev/min with an efficiency of 85 per cent, is to be used as a generator. The armature resistance is 0.150 and the shunt-Held resistance is 2200. If it is driven at 1080 rev/min and the field current is adjusted to 1.1 A, by means of the shunt regulator, what output in kW could be expected as a generator, if the armature copper loss was kept down to that when running as a motor?