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AIIMS AIIMS Solved Paper-2006

  • 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 \[A=10\text{ }lo{{g}_{10}}\text{ }1000\text{ }dB\] \[=(10\times 3){{\log }_{10}}10dB\] \[=30\]         \[(\because \,\,{{\log }_{10}}\,10=1)\]


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