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  1. In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is

    2. A.
    30°
    B.
    60°
    C.
    90°
    D.
    120°

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    Answer : Option C

    Explanation :

    Vdc ∝ (1 + cos a). Maximum possible output voltage occurs when a = 0.

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