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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Self Evaluation Test - Communication System

  • question_answer
    An audio signal represented as \[25\,\sin \,2\pi (2000\,t)\]amplitude modulated by a carrier wave: \[60\,\sin \,2\pi (100\,,\,000)t\]. The modulation index of the modulated signal is   

    A)         \[25%\]

    B) \[41.6%\]

    C) \[50%\]

    D) \[75%\]

    Correct Answer: B

    Solution :

    [b] Modulation index \[=\frac{B}{A}\] \[B=25,\,A=60\] \[\Rightarrow \,\,\,\,\,M.I.=\frac{25}{60}=0.416\Rightarrow m%=41.6%\]


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