1. A load of 6.4 kW at 240 V is supplied from the terminals of a shunt-wound d.c. generator. The field resistance is 180 . Calculate the armature current. 2. (a) Explain with the aid of a diagram how...

1. A load of 6.4 kW at 240 V is supplied from the terminals of a shunt-wound d.c. generator. The field resistance is 180 . Calculate the armature current. 2. (a) Explain with the aid of a diagram how a rotating magnetic field may be obtained. (b) What is meant by ‘synchronous speed’? Calculate the synchronous speed of a 12 pole motor if the supply frequency is 50 Hz.