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Question

A signal of 20 mV is applied to common emitter transistor amplifier circuit. Due to this, the change in base current and the change in collector current are 20 μA and 2 μA respectively. The load resistance is 10 kΩ. The voltage gain is,

A
1000
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B
100
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C
10
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D
0.01
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Solution

The correct option is A 1000
Given:
Input signal, VBE=20 mV=20×103 V

Change in base current, ΔIB=20 μA=20×106 A

Change in collector current, ΔIC=2 mA=2×103A

Load/ output resistance, ro=10 kΩ=10×103 Ω

So, ro=ΔVCEΔIC10×103=ΔVCE2×103

ΔVCE=20 V

Further, voltage gain, AV=VoVi=VCEVBE=2020×103=1000

Hence, (A) is the correct answer.

Why this question?Caution: Some of the data are given in extra to confuse you. All the data given may or may not be used.

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