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NEET-XII-Physics

exam-2 year:2016

with Solutions - page 2
Qstn# 110 Prvs-QstnNext-Qstn
  • #110
    For CE transistor amplifier, the audio signal voltage
    across the collector resistance of 2 k``\Omega`` is 4 V. If the
    current amplification factor of the transistor is
    100 and the base resistance is 1 k``\Omega``, then the input
    signal voltage is :-
    (1) 30 mV
    (2) 15 mV
    (3) 10 mV
    (4) 20 mV
    digAnsr:   4
    Ans : (4)
    Sol. = 100; V0 = 4V; Ri = 103 ;
    R0 = 2 × 103 ; Vi = ?
    AV =
    3
    0 0
    3
    i i i
    V R 4 2 10
    100
    V R V 10

    =  &implies; = 
    &implies; Vi = 20 mV