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BCECE Engineering BCECE Engineering Solved Paper-2003

  • question_answer
    In a triode valve, the plate resistance is 10000\[\Omega \] and the anode load resistance is 30000\[\Omega \]. If the amplification factor is 36, then the voltage gain is:

    A)  9                                            

    B)         27

    C)         36                                         

    D)         108

    Correct Answer: B

    Solution :

    Voltage amplification (gain) is given by \[A=\frac{\mu }{1+\frac{{{r}_{p}}}{{{R}_{L}}}}\] where \[\mu \] is amplification factor,\[{{r}_{p}}\] is plate resistance and \[{{R}_{L}}\]is load resistance. Given, \[\mu =36,{{r}_{p}}=10000\,\Omega ,{{R}_{L}}=30000\,\Omega \] Putting in the relation, we obtain                                 \[A=\frac{36}{1+\frac{10000}{30000}}\]                                                 \[=\frac{36}{1+\frac{1}{3}}\]                                                 \[=\frac{36\times 3}{4}\]                                                 \[=27\]


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