JEE Main & Advanced Physics Communication System / संचार तंत्र JEE PYQ-Communication System

  • question_answer
    A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of 80% will be: [JEE Main Online 16-4-2018]

    A) 11.2 V

    B) 7 V

    C) 22.4 V

    D) 28 V

    Correct Answer: A

    Solution :

    [a] Since
                Modulation Index \[=\frac{{{V}_{m}}}{{{V}_{c}}}\]
                \[{{V}_{m}}=\]Modulating Signal Voltage
                \[{{V}_{c}}=\]Carrier Signal Voltage
                \[0.8=\frac{{{V}_{m}}}{14}\]
    \[{{V}_{m}}=11.2V\]


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