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A 250 V 12 000 W 3000 rpm de shunt motor has Rf Ra and...

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A 250 V 12 000 W 3000 rpm de shunt motor has Rf Ra and full load efficiency of 120 N 0 35 and 85 respectively Determine the external resistance added to the armature circuit to bring the speed to last four digits of your enrolment number rpm Consider load torque is independent of speed

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