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A 200V dc shunt Motor running at 1000 rpm takes armature current of 17.5A. It is required to reduce the speed to 600 rpm.

A 200V dc shunt Motor running at 1000 rpm takes armature current of 17.5A. It is required to reduce the speed to 600 rpm. What must be the value of resistance to be inserted in the armature circuit if the original armature resistance is 0.42? Take armature current to be constant during this process. Ans. 4.412

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