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Known that a Friction and iron losses are 0.5 KW. A shunt connected dc machine driven...

Known that a Friction and iron losses are 0.5 KW. A shunt connected dc machine driven by supplies current of 45 A with 220V and runs at 800 rpm. The armature and field resistance are 0.2 ohm and 0.1 ohm respectively. Find out the efficiency

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