A separately excited DC motor with an armature resistance of 0 02 works on a DC supply of 240 V It draws an armature current of 100A and its rated speed is 1000 RPM It is fed from a chopper controller for its motoring and braking operations Assuming continuous conduction, calculate the duty ratio o...

A separately excited DC motor with an armature resistance of 0.02? works on a DC supply of

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A separately excited DC motor with an armature resistance of 0.02? works on a DC supply of 240 V. It draws an armature current of 100A and its rated speed is 1000 RPM. It is fed from a chopper controller for its motoring and braking operations. Assuming continuous conduction, calculate the duty ratio of chopper at rated torque with a speed of 500RPM during
1).Motoring
2)Braking