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JEE Main & Advanced Physics Semiconducting Devices Question Bank Critical Thinking

  • question_answer
    In the following common emitter configuration an NPN transistor with current gain b = 100 is used. The output voltage of the amplifier will be                               [AIIMS 2003]

    A)            10 mV

    B)            0.1 V

    C)            1.0 V

    D)            10 V

    Correct Answer: C

    Solution :

                       Voltage gain \[=\frac{\text{Output voltage}}{\text{Input voltage}}\]                    Þ Vout = Vin ´ Voltage gain                    Þ Vout = Vin ´ Current gain ´ Resistance gain                     = Vin ´ b ´ \[\frac{{{R}_{L}}}{{{R}_{BE}}}\]= \[{{10}^{-3}}\times 100\times \frac{10}{1}=1V.\]


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