A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45°, the speed is likely to be-A-about 350 rpmB-about 250 rpmC-about 175 rpmD-about 125 rpm-D-about 125 rpm

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A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45&deg;, the speed is likely to be-A-about 350 rpmB-about 250 rpmC-about 175 rpmD-about 125 rpm-D-about 125 rpm

APTITUDE CRACK · Accepted Answer

The correct option is  D about 125 rpm Average output voltage &prop; cos a and therefore reduced to 0.707 of the value for a = 0. Speed is nearly proportional to voltage.

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Q1: A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45°, the speed is likely to be

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Q1: A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45°, the speed is likely to be

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