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JEE Main & Advanced JEE Main Paper (Held On 16 April 2018)

  • 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 16-4-2018]

    A)  11.2 V            

    B)  7 V

    C)  22.4 V            

    D)  28 V

    Correct Answer: A

    Solution :

     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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