Exam Details
| Subject | electronic circuit analysis | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Institute Of Aeronautical Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No Question Paper Code: AEC004
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Regular) May, 2018
Regulation: IARE R16
Electronic Circuit Analysis
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Design an emitter follower having Ri= 600 k Ro=10 Ω Assume hfe=150, hie
hoe=25 Find AI AV for the emitter follower using h-parameters.
Define h-parameters of CE configuration from the input and output characteristics.
2. Derive the expression for voltage gain, input and output impedance of a common emitter configuration
with neat circuit diagram?
Derive the expressions for voltage gain, current gain, input impedance, and output admittance
of a common collector amplifier?
UNIT II
3. Draw the high frequency equivalent of CE mode amplifier
Derive the expression for gain at upper 3dB frequency fH and discuss the effect of bypass
coupling capacitance.
4. Derive an expression for short circuit current gain of a transistor with the help of hybrid- model.
Explain the variation of hybrid- parameters with IC,VCE and temperature.
UNIT III
5. It is desirable to increase the current gain, suggest the suitable multi transistor configuration to
boost AI and derive the expression for AI with the help of small signal equivalent circuit.
Bring out the differences between cascade and cascode type of amplifiers.
6. Draw the circuit diagram of Darlington configuration and derive the expressions for input, output
impedance, voltage and current gains?
Calculate overall cut off frequency of 5 stage cascaded amplifiers having single stage lower cut off
frequency of 5k Hz.
Page 1 of 2
UNIT IV
7. With the help of equivalent circuit, derive the expression for input and output resistance of
current shunt feedback amplifier.
An amplifier with a closed loop gain of 200 is required and this gain should not vary more than
1 when the inherent gain of the amplifier without feedback varies by 20. Find the values of Av
and beta.
8. Explain how oscillators are classified and conditions for oscillations.
Write a short note on
i. Colpitts and Hartley Oscillator
ii. RC phase shift Oscillator
UNIT V
9. Explain the operation of class B push pull amplifier and also derive the expression for maximum
conversion efficiency.
A single stage class A amplifier has VCC=20V, VCEQ=10V, ICQ=600mA and collector load
resistor RL=16Ω. The AC output current varies by ±300mA with the ac input signal. Determine
i. The power supplied by the DC source to the amplifier circuit.
ii. DC power consumed by the load resistor
iii. AC power developed across the load resistor
iv. DC power delivered to the transistor
v. DC power wasted in transistor collector
vi. Overall efficiency
10. Explain the operation of transformer coupled class A amplifier and derive the maximum conversion
efficiency.
Briefly discuss the operation of class amplifier and uses.
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Regular) May, 2018
Regulation: IARE R16
Electronic Circuit Analysis
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Design an emitter follower having Ri= 600 k Ro=10 Ω Assume hfe=150, hie
hoe=25 Find AI AV for the emitter follower using h-parameters.
Define h-parameters of CE configuration from the input and output characteristics.
2. Derive the expression for voltage gain, input and output impedance of a common emitter configuration
with neat circuit diagram?
Derive the expressions for voltage gain, current gain, input impedance, and output admittance
of a common collector amplifier?
UNIT II
3. Draw the high frequency equivalent of CE mode amplifier
Derive the expression for gain at upper 3dB frequency fH and discuss the effect of bypass
coupling capacitance.
4. Derive an expression for short circuit current gain of a transistor with the help of hybrid- model.
Explain the variation of hybrid- parameters with IC,VCE and temperature.
UNIT III
5. It is desirable to increase the current gain, suggest the suitable multi transistor configuration to
boost AI and derive the expression for AI with the help of small signal equivalent circuit.
Bring out the differences between cascade and cascode type of amplifiers.
6. Draw the circuit diagram of Darlington configuration and derive the expressions for input, output
impedance, voltage and current gains?
Calculate overall cut off frequency of 5 stage cascaded amplifiers having single stage lower cut off
frequency of 5k Hz.
Page 1 of 2
UNIT IV
7. With the help of equivalent circuit, derive the expression for input and output resistance of
current shunt feedback amplifier.
An amplifier with a closed loop gain of 200 is required and this gain should not vary more than
1 when the inherent gain of the amplifier without feedback varies by 20. Find the values of Av
and beta.
8. Explain how oscillators are classified and conditions for oscillations.
Write a short note on
i. Colpitts and Hartley Oscillator
ii. RC phase shift Oscillator
UNIT V
9. Explain the operation of class B push pull amplifier and also derive the expression for maximum
conversion efficiency.
A single stage class A amplifier has VCC=20V, VCEQ=10V, ICQ=600mA and collector load
resistor RL=16Ω. The AC output current varies by ±300mA with the ac input signal. Determine
i. The power supplied by the DC source to the amplifier circuit.
ii. DC power consumed by the load resistor
iii. AC power developed across the load resistor
iv. DC power delivered to the transistor
v. DC power wasted in transistor collector
vi. Overall efficiency
10. Explain the operation of transformer coupled class A amplifier and derive the maximum conversion
efficiency.
Briefly discuss the operation of class amplifier and uses.
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