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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Critical Thinking

  • question_answer
    A 500 Hz modulating voltage fed into an FM generator produces a frequency deviation of 2.25 kHz. If amplitude of the voltage is kept constant but frequency is raised to 6 kHz then the new deviation will be 

    A)            4.5 kHz                                    

    B)            54 kHz

    C)            27 kHz                                     

    D)            15 kHz

    Correct Answer: B

    Solution :

                       \[{{m}_{f}}=\frac{\delta }{{{f}_{m}}}=\frac{2250}{500}=4.5\] \ New deviation \[=2({{m}_{f}}\,{{f}_{m}})=2\times 4.5\times 6=54\,kHz.\]


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