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JCECE Engineering JCECE Engineering Solved Paper-2007

  • question_answer
    An amplifier has a voltage gain\[{{A}_{v}}=1000\]. The voltage gain in \[dB\] is

    A) \[30\,\,dB\]                       

    B) \[60\,\,dB\]

    C)  \[3\,\,dB\]                                        

    D)  \[20\,\,dB\]

    Correct Answer: A

    Solution :

    Voltage gain,\[{{A}_{v}}=1000\] In\[dB\], voltage gain                 \[A=10{{\log }_{10}}1000\,\,dB\]                    \[=(10\times 3){{\log }_{10}}10\,\,dB\]                    \[=30\,\,dB\]  \[(\because \,\,{{\log }_{10}}10=1)\]


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