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  1. AM amplifier having noise figure of 20 dB and available power gain of 15 dB is followed by a mixer circuit having noise figure of 9 dB. The overall noise figure as referred to input in dB is

    2. A.
    10.44
    B.
    11.07
    C.
    21.52
    D.
    0.63

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    Answer : Option A

    Explanation :

    .

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