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  1. The antenna current of an AM broad cast transmitter, modulated to a depth of 40% by an audio sine wave is 11 amperes. It increased to 12 ampere as a result of simultaneous modulation by another sine wave. The modulation index due to this second sine wave is :

    2. A.
    0.4
    B.
    0.757
    C.
    0.643
    D.
    0.8

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    Answer : Option C

    Explanation :

    μ2 = 0.57057, μ12 + 0.16 = 0.57057

    ⇒ μ1 = 0.64 .

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