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OpenStudy (anonymous):

A 230 V, 960 rpm and 200 A separately excited dc motor has an armature resistance of 0.02 ohms. The motor is fed from a chopper which provides both motoring and braking operation. The source has a voltage of 230 V. Assuming continuous conduction mode. Calculate duty ratio (duty cycle) of chopper for braking operation at rated torque and 350 rpm

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