A 4-pole d.c. armature wave winding has 294 conductors; 1.1 What flux per pole is necessary to generate 230 V when rotating at 1500 rev/min? [2] 1.2 What is the electromagnetic torque at this flux when rated armature current of 120 A is flowing? [2] 1.3 How many interpole ampere turns are required with this current if the interpole gap density is to be 0.15 tesla and the effective radial air gap = 8 mm? Neglect the m.m.f. absorbed by the iron. [6] 1.4 Through what mechanical angle must the brushes be moved away from the quadrature axis if it is required to produce a direct-axis magnetisation of 200 At/pole