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VIT Engineering VIT Engineering Solved Paper-2010

  • question_answer
    Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 kHz producing 50% modulation. The lower and upper side-band frequencies in kHz are

    A)  1490, 1510     

    B)  1510,1490

    C)  \[\frac{1}{1490},\frac{1}{1510}\]

    D)  \[\frac{1}{1510},\frac{1}{1490}\]  

    Correct Answer: A

    Solution :

    Here \[{{f}_{c}}=1.5MHz=1500kHz,\,\,{{f}_{m}}=10kHz\] \[\therefore \]   Low side-band frequency \[={{f}_{c}}-{{f}_{m}}=1500kHz-10kHz\] \[=1490kHz\] Upper side-band frequency \[={{f}_{c}}+{{f}_{m}}=1500kHz+10kHz\] \[=1510kHz\]


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