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A 220V DC series motor has an armature resistance of 0.32 and field resistance of 0.292. It runs at a speed of 700 rpm

A 220V DC series motor has an armature resistance of 0.32 and field resistance of 0.292. It runs at a speed of 700 rpm taking a current of 15A. Calculate the resistance to be inserted in series with the armature to reduce the speed to 600rpm. The input current remains constant. Assume that the magnetization characteristics is st. line. Ans. 2.0292

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