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A 220 V D.C. machine has an armature resistance of 0.5 Ω. If the full-load armature...

A 220 V D.C. machine has an armature resistance of 0.5 Ω. If the full-load armature current is 20 A, find the induced e.m.f. when the machine acts as (i) a generator and (ii) a motor.        

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