Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 75
77. In the case of a common emitter transistor amplifier, the ratio of the collector current to the emitter current $I_c / I_e$ is 0.96 . The current gain of the amplifier is
(a) 6
(b) 48
(c) 24
(d) 12
[2002]
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Answer:
Correct Answer: 77. (c)
Solution:
- (c) $\frac{I_c}{I_e}=0.96$
$\Rightarrow I_c=0.96 I_e$ But $I_e=I_c+I_b=0.96 I_e+I_b$
$\Rightarrow I_b=0.04 I_e$
$\therefore$ Current gain, $\beta=\frac{I_c}{I_b}=\frac{0.96 I_e}{0.04 I_e}=24$
