Exam Details
| Subject | analog communications | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Institute Of Aeronautical Engineering | |
| Position | ||
| Exam Date | June, 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 (Supplementary) June, 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. Explain linear time invariant system.
Explain convolution and write the advantages of LTI system.
2. What is continuous-time system and classification of systems based on the properties.
Define stability and causality. Write the properties of auto correlation.
UNIT II
3. Explain the operation of the envelope detector with circuit diagram and wave form.
Define amplitude modulation and write standard equation for its spectrum with a neat sketch.
4. Give comparison of amplitude modulation techniques
Explain the operation of quadrature carrier multiplexing scheme with transmitter and receiver
diagram.
UNIT III
5. Explain the generation of Single Side Band modulated signal using frequency discriminator
method with neat block diagram and waveforms and necessary mathematical expressions.
Compare AM, DSBSC and SSBSC modulation schemes in terms of power, bandwidth, modulation
efficiency, carrier suppression and applications.
6. Explain Vestigial Side Band Modulation with the help of waveforms and mathematical expressions.
What is the need for VSB transmission? What is the transmission bandwidth?
Explain the demodulation of SSBSC wave using synchronous detector with necessary block diagram
and mathematical expressions.
Page 1 of 2
UNIT IV
7. What are the advantages of frequency modulation? Give relationship between frequency and
phase modulation.
With a block diagram approach, explain the generation of wideband FM wave by first generating
narrowband FM wave.
8. Determine Fourier transform for exp exp 3).
Explain the operation of discriminator with circuit diagram and characteristics for the demodulation
of FM signals.
UNIT V
9. With a circuits and characteristics, explain the importance of pre-emphasis and de-emphasis in
FM system.
A 400watt carrier is modiulated to a depth of 75% calculate the frequency the total power in
modulated wave.
10. What is local oscillator? Explain intermediate frequency amplifier.
Explain Super heterodyne receiver with a neat block diagram.
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Supplementary) June, 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. Explain linear time invariant system.
Explain convolution and write the advantages of LTI system.
2. What is continuous-time system and classification of systems based on the properties.
Define stability and causality. Write the properties of auto correlation.
UNIT II
3. Explain the operation of the envelope detector with circuit diagram and wave form.
Define amplitude modulation and write standard equation for its spectrum with a neat sketch.
4. Give comparison of amplitude modulation techniques
Explain the operation of quadrature carrier multiplexing scheme with transmitter and receiver
diagram.
UNIT III
5. Explain the generation of Single Side Band modulated signal using frequency discriminator
method with neat block diagram and waveforms and necessary mathematical expressions.
Compare AM, DSBSC and SSBSC modulation schemes in terms of power, bandwidth, modulation
efficiency, carrier suppression and applications.
6. Explain Vestigial Side Band Modulation with the help of waveforms and mathematical expressions.
What is the need for VSB transmission? What is the transmission bandwidth?
Explain the demodulation of SSBSC wave using synchronous detector with necessary block diagram
and mathematical expressions.
Page 1 of 2
UNIT IV
7. What are the advantages of frequency modulation? Give relationship between frequency and
phase modulation.
With a block diagram approach, explain the generation of wideband FM wave by first generating
narrowband FM wave.
8. Determine Fourier transform for exp exp 3).
Explain the operation of discriminator with circuit diagram and characteristics for the demodulation
of FM signals.
UNIT V
9. With a circuits and characteristics, explain the importance of pre-emphasis and de-emphasis in
FM system.
A 400watt carrier is modiulated to a depth of 75% calculate the frequency the total power in
modulated wave.
10. What is local oscillator? Explain intermediate frequency amplifier.
Explain Super heterodyne receiver with a neat block diagram.
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