Basic BJT Amplifier Configuration MCQ’s

Electronic Devices & Circuits Electronics & Communication Engineering

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Basic BJT Amplifier Configuration”.

(Q1-Q.6) An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ, then
1. Find Gm.
a) 1 A/V
b) 10 A/V
c) 100 A/V
d) 1000 A/V

2. Find Gvo.
a) 53.3 V/V
b) 63.3 V/V
c) 73.3 V/V
d) 83.3 V/V

3. Find R out.
a) 146 Ω
b) 292 Ω
c) 584 Ω
d) 1168 Ω

4. Find Gv.
a) 53.4 V/V
b) 72.7 V/V
c) 83.3 V/V
d) 90.9 V/V

5. Find Av.
a) 9.09 V/V
b) 10 V/V
c) 90.9 V/V
d) 100 V/V

6. Find Ai.
a) 182 A/A
b) 364 A/A
c) 546 A/A
d) 728 A/A

(Q.7-Q.10) The circuit shown below is a small sine wave signal with average zero and transistor ß =

electronic-devices-circuits-questions-answers-basic-bjt-amplifier-configuration-q7


7. Find R(C) to establish a dc collector voltage of about +5V.
a) 5 kΩ
b) 10 kΩ
c) 15 kΩ
d) 20 kΩ

8. Find the value of R(E) to establish a dc emitter current of about 0.5 mA.
a) 28.57 kΩ
b) 57.04 kΩ
c) 114.08 kΩ
d) 228.16 kΩ

9. For R (L) = 10 kΩ and transistor Ro = 200 kΩ, determine the overall voltage gain.
a) -21 V/V
b) -42 V/V
c) -86 V/V
d) -123 V/V

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