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Test: Basic BJT Amplifier Configuration


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10 Questions MCQ Test Analog Electronics | Test: Basic BJT Amplifier Configuration

Test: Basic BJT Amplifier Configuration for Electronics and Communication Engineering (ECE) 2023 is part of Analog Electronics preparation. The Test: Basic BJT Amplifier Configuration questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Basic BJT Amplifier Configuration MCQs are made for Electronics and Communication Engineering (ECE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Basic BJT Amplifier Configuration below.
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Test: Basic BJT Amplifier Configuration - Question 1

(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

Q. Find Gm.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 1

Gm = (voltage gain in V/V) / (output resistance) or 100/100 A/V.

Test: Basic BJT Amplifier Configuration - Question 2

 Find Av.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 2

 Av = Avo X Rl/Ro+Rl or 100 X 1000/1000+100 or 90.9 V/V.

Test: Basic BJT Amplifier Configuration - Question 3

Find Gvo.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 3

Gvo = (Avo X input resistance) / (input resistance + signal resistance).

Test: Basic BJT Amplifier Configuration - Question 4

Find Gv.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 4

Gv = (Gvo X Av) / Avo or 83.3 X 90.9 / 100 V/V.

Test: Basic BJT Amplifier Configuration - Question 5

 Find R out.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 5

 Rout = Rl (1 – Gvo/Gv). Put in the respective values and solve.

Test: Basic BJT Amplifier Configuration - Question 6

Find Ai.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 6

(Vo X R in) / (Vi X Rl) gives the required value of Ai.

Test: Basic BJT Amplifier Configuration - Question 7

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

Q. Find the value of R(E) to establish a dc emitter current of about 0.5 mA.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 7

Test: Basic BJT Amplifier Configuration - Question 8

 Find R(C) to establish a dc collector voltage of about +5V.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 8

Vc = 15 – Rc.Ic
5 = 15 – Rc * 0.99 * 0.5m
Rc = 20.2kΩ
= 20kΩ.

Test: Basic BJT Amplifier Configuration - Question 9

 For R (L) = 10 kΩ and transistor Ro = 200 kΩ, determine the overall voltage gain.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 9

Test: Basic BJT Amplifier Configuration - Question 10

 Find the overall voltage gain.

Detailed Solution for Test: Basic BJT Amplifier Configuration - Question 10

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