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A 240 V shunt motor with the armature resistance of 0.1 Ω runs at 850 r p.m. for an armature current of 70 A. If its speed is to be reduced to 650 r.p.m. the resistance to be placed in series for an armature current of 50 A is nearly

[ESE 2019 Paper 2 (Technical) ECE]
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