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B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm takes...

B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm takes 35 A. The shunt field resistance is 110 Ω and armature resistance is 0.4 Ω iron and friction losses is 800 W. Find. a- Maximum efficiency. b- The resistance sections of starter connected to this motor by using same armature resistance and voltage supply from above. if maximum armature current is 50 A and the resistance of first section is 1.95 Ω

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