a 240v, 4pole shunt motor running at 1000 r.p.m gives15 hp with an armature current of 50 A and field current of 1 A.the armature winding is wave connected and has 540 conductors. thearmature resistance is 0.1 ohm and drop at each brush is 1v. find(i) useful torque, (ii) the total torque (iii) useful flux perpole, (iv) iron and friction losses
