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Discussion :: Power Electronics

  1. 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

  2. A.
    about 300 rpm
    B.
    about 150 rpm
    C.
    about 75 rpm
    D.
    about zero

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    Answer : Option A

    Explanation :

    Average output voltage is reduced to 50% if a = 90°. Hence speed is also reduced to 50%.


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