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J & K CET Engineering J and K - CET Engineering Solved Paper-2014

  • question_answer
    A message signal of frequency \[20\text{ }kHz\] and peak voltage of \[15\text{ }V\]is used to modulate a carrier wave of \[1000\text{ }kHz\]and peak voltage of\[30\text{ }V\]. The modulation index and upper side band are respectively

    A)   \[0.50\]and \[1020\text{ }kHz\]

    B)  \[0.66\]and \[1020\text{ }kHz\]

    C)  \[0.50\]and \[980\text{ }kHz\]

    D)  \[0.66\]and \[980\text{ }kHz\]

    Correct Answer: A

    Solution :

    Modulation index \[(\mu )=\frac{{{A}_{m}}}{{{A}_{C}}}\] \[=\frac{15}{30}=\frac{1}{2}\] Frequency of upper side band \[=({{f}_{c}}+{{f}_{m}})\] \[=1000+20=1020kHz\]


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