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  1. A 1000 kHz carrier wave modulated 40% at 4000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after passing the wave through this circuit?

    2. A.
    0.4
    B.
    0.2
    C.
    0.27
    D.
    0.554

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    Answer : Option C

    Explanation :

    Resulting depth of modulation is given by :

    when δ =

    fc = 1000 x 103 Hz

    fm = 4 x 103 Hz

    δ =

    m0 =

    = = 0.27 .

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