A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be-A-about 300 rpmB-about 150 rpmC-about 75 rpmD-about zero-A-about 300 rpm

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A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90&deg;, the speed is likely to be-A-about 300 rpmB-about 150 rpmC-about 75 rpmD-about zero-A-about 300 rpm

APTITUDE CRACK · Accepted Answer

The correct option is  A about 300 rpm Average output voltage is reduced to 50% if a = 90&deg;. Hence speed is also reduced to 50%.

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Q1: A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be

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Q1: A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be

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