Q/ A d.c. series motor takes 38 A at 240 V and runs at 940 r.p.m. If the armature and field resistance are 0.21 2 and 0.11 2 respectively and the iron and friction losses are 0.52 kW, find (1) The...

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Extracted text: Q/ A d.c. series motor takes 38 A at 240 V and runs at 940 r.p.m. If the armature and field resistance are 0.21 2 and 0.11 2 respectively and the iron and friction losses are 0.52 kW, find (1) The back e.m.f (2) the torque developed in the armature if the motor speed is halved. (3) The motor efficiency.