VIGNAN’S INSTITUTE OF INFORMATION TECHNOLOGY (A) :: VISAKHAPATNAM
Examination Cell- Circular
VIIT/EC/Cir/2022-23-II-II Sem/MidQB /01
Date: 08.04.2023
(2021 BATCH-VR20) II B.Tech II Semester
MID-1 QUESTION BANK, April 2023
All the HODs are requested to instruct your course coordinators of II B.TECH. II SEMESTER
subjects, they have to submit Question Bank consist of minimum number of 8 descriptive type
questions and 10 short answer type questions from each unit of respective subjects to your
department exam cell coordinator as per the format given below. Exam cell coordinators are requested to
submit both hard and soft copy to the concerned ACEs in person on or before 13-04-2023 3.00 PM
( i.e. Saturday) without delay.
NOTE: Don’t send soft copy through e-mail.
Copy to :
ALL HOD’S
CE/DE
Principal
Please follow the standard of the question paper as per the norms:
PART-A
As per the Bloom Taxonomy Level
LEVEL – 2 (Easy)
No. of
Questions
– 50 %
05
LEVEL > 2 (Average) – 50 %
05
Each Unit
PART-B
No. of Questions
UNIT
1
As per the Bloom Taxonomy Level
LEVEL– 2 (Understanding) – 25 %
Essay
Type
Short
Answer
Type
2
3
4
5
2
2
2
3
4
5
Each unit LEVEL– 3 (Applying) – 50 %
LEVEL >3 (Analyzing and Evaluate) – 25 %
VIGNAN’S INSTITUTE OF INFORMATION TECHNOLOGY (A)
Question Bank Mid-I Portion
(2020 Batch) II B.Tech- II Semester (VR20), March 2023
Name of the Subject: ……Analog Electronic Circuits-1
Subject Code: ………………………
Branch ……………ECE…………………Date of Examination ….18-04-2023…………………………
Name of the Faculty: Mrs. P. Mamathadevi / Dr. Diptiranjan, Designation: Asst. Professor
EMAIL: …………………………………………Phone No: ……………….Experience: …………...
UNIT WISE FORMAT FOR (VR20 Regulation)
UNIT-1 PART-A
Q. No
1
2
3
4
5
6
7
8
9
10
Short Answer Questions
Level of
Bloom
Taxonomy
CO
Write a short note on gain Bandwidth product
Draw the high frequency π model of a CE transistor.
Define cutoff Frequencies fα ,fβ and fT.
Define Frequency Response and Cut off Frequencies.
Define Base Spreading Resistance.
Draw the high frequency π model of a FET
Write the elements of the Hybrid π model.
Derive the Expression for output conductance of Hybrid π model.
Derive the Expression for input conductance of Hybrid π model.
Derive the Expression for Feedback conductance of Hybrid π model.
Marks
(2M)
2M
2M
2M
2M
2M
2M
2M
2M
2M
2M
UNIT-1 PART-B
Q. No
A
1
B
2
A
B
3
A
4
5
A
B
A
B
A
6
B
7
A
Descriptive Questions
What is the relationship between fT and fβ ? Discuss the Significance of
fT.
Derive the expressions for CE short circuit current gain as a function of
frequency and hence define the α, β cut off frequencies.
Explain about the Validity of Hybrid π model.
With a neat Sketch explain about FET
Define Hybrid π model. Draw and derive the expressions for different
elements of Hybrid π model.
(i) Trans conductance
(ii) Input conductance
Draw and explain about the small signal high frequency equivalent
circuit of a common emitter amplifier.
Discuss the frequency response of BJT at high frequencies?
With a neat Sketch explain about FET.
Discuss the small signal high frequency equivalent circuit of FET?
A certain transistor with the collector current IC = 1 mA and VCE = 10
V, shows Cc=Cb’c =3 PF, hfe = 200 and ωT = -500 M rad/sec. Calculate
the transistor trans-conductance gm, the resistance between the internal
node B’ and E (rb’e), forward biased base-emitter junction capacitance
(Ce = Cb’e) and frequency at collector emitter terminal (fT).
Short circuit CE current gain of transistor is 25 at a frequency of 2
MHz if fβ = 200 kHz. Calculate fT, feedback current gain hfe, and | Ai| at
frequency 10 MHz.
A high frequency amplifier uses a transistor which is driven from a
source with Rs = 0. Calculate the value of fH, if RL =0 and RL =1 KΩ.
Assume rb’e = 1K, Ce = 100 PF, Cc = 3 PF.
Level of
Bloom
Taxonomy
CO
Marks
(10 M)
5M
5M
5M
5M
10M
5M
5M
5M
5M
5M
5M
5M
B
8
A
A high frequency amplifier uses a transistor which is driven from a
source with Rs = 1 K. Calculate the value of fH, Avs low and Avs high if RL
=0 and RL =1 KΩ. Assume rb’e = 1K, Ce = 100 PF, Cc = 3 PF, gm = 50
mA/V.
Derive the expression of gain bandwidth product for voltage and
current.
5M
10M
UNIT-2 PART-A
Q. No
Short Answer Questions
1
What are Multi Stage Amplifiers? What is the need of it?
Derive the Equation for the overall Voltage gain of a multi stage amplifier in terms of
the individual voltage gains.
What are the functions performed by Coupling Devices?
List out different Coupling methods used in Multi Stage Amplifiers? Which coupling
method has good frequency Response?
Explain about Bootstrapping?
Define Two Stage RC Coupled Amplifier?
A 3 Stage Amplifier has a First Stage Voltage Gain of 50, Second Stage Voltage gain of
300 and Third Stage is 500. Find the total Voltage Gain in dB.
A Certain amplifier has Voltage gain of 20dB. If the input signal voltage is 0.5V, what
is the output Voltage?
What are the advantages of Darlington amplifier?
Draw the circuit diagram of bootstrap emitter follower?
2
3
4
5
6
7
8
9
10
Level of Bloom
Taxonomy
CO
Marks
(2M)
2M
2M
2M
2M
2M
2M
2M
2M
2M
2M
UNIT-2 PART-B
Descriptive Questions
Q. No
A
1
B
A
B
A
B
2
3
4
A
5
A
6
A
B
7
A
B
A
B
8
Level of Bloom
Taxonomy
CO
Explain the Operation of Two Stage RC Coupled Amplifier? With neat
Diagram
Derive the Frequency Response of Two Stage RC Coupled Amplifier.
Explain the steps to analyze multistage amplifiers?
Explain comparison of different coupling techniques?
Explain about Bootstrap Emitter Follower with neat Diagram.
Explain Bootstrap emitter follower & determine Ri, Ro, Av, Ai?
Draw the equivalent circuits of RC coupled amplifier for mid band, low
frequency range and high frequency range.
Derive the Expressions for Current Gain, Voltage gain, Input Resistance and
Output Resistances of Darlington Amplifier.
Determine expression for Av, Ai for an n stage cascaded amplifier?
Draw the circuit diagram of CASCODE Amplifier & Determine Ri, Ro, Av,
Ai?
Explain CE-CE cascaded amplifier & determine overall Ri, Ro, Av, Ai?
Draw the circuit diagram of two stage RC coupled Amplifier & Determine Ri,
Ro, Av, Ai?
Marks
(10 M)
5M
5M
5M
10M
5M
5M
10M
10M
5M
5M
5M
5M
Explain CE-CB cascaded amplifier & determine overall Ri, Ro, Av, Ai?
Explain comparison of different coupling techniques?
5M
5M
UNIT-3 PART-A
Q. No
1
Short Answer Questions
Define Sensitivity? Derive the Expression of it.
Level of Bloom
Taxonomy
CO
Marks
(2M)
2M
2
3
4
5
2M
Classify types of Feedback and explain negative feedback and write gain expression.
What are the expressions for Input resistance, Output Resistance with feedback of
Current Series Feedback Amplifier
Compare Negative and Positive Feedback.
An amplifier with stage gain of 200 is provided with negative feedback of feedback
ratio 0.05. Find the new gain.
2M
2M
2M
UNIT-3 PART-B
Q.
No
1
Descriptive Questions
Level of Bloom
Taxonomy
CO
Marks
(4 M)
4M
3
Derive the Expression for Rif and Rof of Voltage series Feedback Amplifier.
An Amplifier with 3.5KΩ input resistance and 50KΩ output resistance has a voltage gain of
400.The amplifier is now modified to provide 4% negative Voltage Feedback in series with the
input. Calculate voltage gain, input Resistance, and output Resistance with feedback.
Explain Feedback Concept and Principle in detail.
4
Explain Feedback Topologies in detail.
4M
5
Show that the Bandwidth increases by using Negative Feedback in Amplifiers.
4M
2
Name & Signature of the faculty
4M
4M
Signature of HoD