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Q#1 AC and DC Drives GATE EE 2008 MCQ +2 marks -0.66 marks

A 220V, 1400 rpm, 40A separately excited dc motor has an armature resistance of 0.4Ω. The motor is fed from a single phase circulating current dual converter with an input ac line voltage of 220V (RMS). The approximate firing angles of the dual converter for motoring operation at 50% of rated torque and 1000 rpm will be

43°, 137°

43°, 47°

39°, 141°

39°, 51°

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