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

  • question_answer
    A device with input \[x(t)\] and output \[y(t)\] is characterized by: \[y(t)={{x}^{2}}(t)\]. An FM signal with frequency deviation of \[90\text{ }kHz\] and modulating signal bandwidth of \[5\text{ }kHz\] is applied to this device. The bandwidth of the output signal is   

    A)   \[370\,kHz\]

    B) \[190\,kHz\]

    C) \[380\,kHz\]

    D) \[95\,kHz\]

    Correct Answer: C

    Solution :

    [c] For \[x(t),\,BW=2(\Delta \omega +\omega )\] \[\Delta \omega \] is deviation and cd is the band width of modulating signal.                            \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,BW=2(90+5)=190\] For \[{{x}^{2}}(t),\,\,BW=2\times 190=380\]


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