A 440 V d.c. Armature resistance of shunt motor is 0.25 Ω and field winding resistance is 220 Ω. A motor draws a current of 40 A from the mains and runs at 1500 rpm when it supplies some load. Now find the speed of the motor when a resistance of 0.8Ω is connected in series with the armature. Assume armature current constant. The shunt field flux remains constant.

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A 440 V d.c. Armature resistance of shunt motor is 0.25 Ω and field winding resistance is 220 Ω. A motor draws a current of 40 A from the mains and runs at 1500 rpm when it supplies some load. Now find the speed of the motor when a resistance of 0.8Ω is connected in series with the armature. Assume armature current constant. The shunt field flux remains constant.

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