Exam Question

(a) What are the different types of DC motors? (6)

(b) A 10 H.P. 230 V shunt motor takes an armature current of 6A from 230 V mains at no load runs at 1200 r.p.m. The armature resistance is 0.25 Ω. Determine speed and electromagnetic torque when the armature takes 36 amps. with the same flux. (10)