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Q#1 Chopper GATE EE 2013 MCQ +2 marks -0.66 marks

The separately excited dc motor in the figure below has a rated armature current of 20A and a rated armature voltage of 150 V. An ideal chopper switching at 5 kHz is used to control the armature voltage. If , , neglecting armature reaction, the duty ratio of the chopper to obtain 50% of the rated torque at the rated speed and the rated field current is

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