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Q#1 Phase Controlled Converter GATE EE 2007 MCQ +2 marks -0.66 marks

A three-phase, 440 V, 50 Hz ac mains fed thyristor bridge is feeding a 440 V dc, 15 kW, 1500 rpm separately excited dc motor with a ripple free continuous current in the dc link under all operating conditions. Neglecting the losses, the power factor of the ac mains at half the rated speed, is

0.354      

0.372

0.90      

0.955

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