Exam Details
| Subject | analog communications | |
| 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: AEC005
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Regular) May, 2018
Regulation: IARE R16
ANALOG COMMUNICATIONS
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. Define a system. Explain in detail about classification of systems.
State auto correlation and cross correlation. Prove any two properties of cross correlation.
2. Define the following
i. Signal bandwidth
ii. System bandwidth
iii. Transfer function of an LTI system
Determine the convolution of the following signals by graphical method
i. x u
ii. u
UNIT II
3. Explain the demodulation of AM wave using envelope detector with necessary block diagram and
waveforms.
Explain the noise performance of Double Side Band Suppressed Carrier (DSBSC) system and
obtain its figure of merit.
4. Explain the generation of Double Side Band Suppressed Carrier (DSBSC) wave using balanced
modulator with necessary block diagram, waveforms and mathematical expressions.
An audio frequency signal 10Sin(2500t) is used to amplitude modulate a carrier of
50sin(5105t). Calculate
i. Modulation index
ii. Side band frequencies
iii. BW required
iv. Total power delivered to the load of 600
.
Page 1 of 2
UNIT III
5. What is the significance of VSB signal and where does it find its application? Draw the frequency
response of a VSB modulation and give its justification.
What is quadrature null effect and how it can be eliminated.
6. Explain the generation of Single Side Band modulated signal using phase discriminator method
with neat block diagram, waveforms and necessary mathematical expressions.
Explain the noise performance of Single Side Band modulation system.
UNIT IV
7. Explain the generation of Frequency Modulation waves using indirect method (Armstrong
method)
A carrier wave of frequency 100MHz and amplitude of 5V is frequency modulated by a sine
wave of amplitude 20V and frequency 100 KHz. The frequency sensitivity of the modulator is
25 KHz/volt. Determine the approximate power, bandwidth of FM wave and write FM wave
equation.
8. Classify the frequency modulation based on modulation index parameter and Compare
Narrow band FM and Wide band FM .
What is Pre-emphasis and De-emphasis. Explain with neat diagrams.
UNIT V
9. What are the types of sampling techniques and explain about Flat top sampling with neat diagram
and waveforms.
With neat block diagram explain the working principle of Tuned Radio Frequency receiver.
10. Explain in detail about super heterodyne AM reciever and what is need of automatic gain control
in receivers.
Describe the receiver characteristics of following
i. Selectivity
ii. Fidelity
iii. Sensitivity
iv. Intermediate frequency
v. Image frequency rejection ratio
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Regular) May, 2018
Regulation: IARE R16
ANALOG COMMUNICATIONS
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. Define a system. Explain in detail about classification of systems.
State auto correlation and cross correlation. Prove any two properties of cross correlation.
2. Define the following
i. Signal bandwidth
ii. System bandwidth
iii. Transfer function of an LTI system
Determine the convolution of the following signals by graphical method
i. x u
ii. u
UNIT II
3. Explain the demodulation of AM wave using envelope detector with necessary block diagram and
waveforms.
Explain the noise performance of Double Side Band Suppressed Carrier (DSBSC) system and
obtain its figure of merit.
4. Explain the generation of Double Side Band Suppressed Carrier (DSBSC) wave using balanced
modulator with necessary block diagram, waveforms and mathematical expressions.
An audio frequency signal 10Sin(2500t) is used to amplitude modulate a carrier of
50sin(5105t). Calculate
i. Modulation index
ii. Side band frequencies
iii. BW required
iv. Total power delivered to the load of 600
.
Page 1 of 2
UNIT III
5. What is the significance of VSB signal and where does it find its application? Draw the frequency
response of a VSB modulation and give its justification.
What is quadrature null effect and how it can be eliminated.
6. Explain the generation of Single Side Band modulated signal using phase discriminator method
with neat block diagram, waveforms and necessary mathematical expressions.
Explain the noise performance of Single Side Band modulation system.
UNIT IV
7. Explain the generation of Frequency Modulation waves using indirect method (Armstrong
method)
A carrier wave of frequency 100MHz and amplitude of 5V is frequency modulated by a sine
wave of amplitude 20V and frequency 100 KHz. The frequency sensitivity of the modulator is
25 KHz/volt. Determine the approximate power, bandwidth of FM wave and write FM wave
equation.
8. Classify the frequency modulation based on modulation index parameter and Compare
Narrow band FM and Wide band FM .
What is Pre-emphasis and De-emphasis. Explain with neat diagrams.
UNIT V
9. What are the types of sampling techniques and explain about Flat top sampling with neat diagram
and waveforms.
With neat block diagram explain the working principle of Tuned Radio Frequency receiver.
10. Explain in detail about super heterodyne AM reciever and what is need of automatic gain control
in receivers.
Describe the receiver characteristics of following
i. Selectivity
ii. Fidelity
iii. Sensitivity
iv. Intermediate frequency
v. Image frequency rejection ratio
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