Exam Details
| Subject | analog and digital communications | |
| Paper | paper 2 | |
| Exam / Course | m.sc. electronics and communications | |
| Department | ||
| Organization | rayalaseema university | |
| Position | ||
| Exam Date | December, 2017 | |
| City, State | andhra pradesh, kurnool |
Question Paper
M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Electronics and Communications
Paper II ANALOG AND DIGITAL COMMUNICATIONS
2 21332-A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Explain need for modulation.
2. Discuss power relations in AM waves.
3. Describe about COST AS loop.
4. Explain Narrow band FM.
5. Explain Model of Digital communication system.
6. Derive the Expression for Quantization noise.
7. Write a note on ASK modulator.
8. Discuss Differential PSK.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Define Amplitude Modulation? Discuss Square law modulator and
modulation index.
Or
Explain Detection of AM wave and Explain Envelope detector.
10. Write a note on Coherent detection of DSBSC waves and Discuss the Ring
Modulator.
Or
Explain Frequency Modulation and Spectrum Analysis of Sinusoidal FM
wave.
Discuss the transmission bandwidth of FM wave.
11. State and prove Sampling theorem.
Discuss the Hartley Shannon Law.
Or
Explain PCM generation and Reconstruction.
12. Discuss the ASK modulator and Coherent ASK detector.
Or
Explain the Non-coherent PSK Detector.
Discuss the BPSK Modulator
———————
Third Semester
Electronics and Communications
Paper II ANALOG AND DIGITAL COMMUNICATIONS
2 21332-A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Explain need for modulation.
2. Discuss power relations in AM waves.
3. Describe about COST AS loop.
4. Explain Narrow band FM.
5. Explain Model of Digital communication system.
6. Derive the Expression for Quantization noise.
7. Write a note on ASK modulator.
8. Discuss Differential PSK.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Define Amplitude Modulation? Discuss Square law modulator and
modulation index.
Or
Explain Detection of AM wave and Explain Envelope detector.
10. Write a note on Coherent detection of DSBSC waves and Discuss the Ring
Modulator.
Or
Explain Frequency Modulation and Spectrum Analysis of Sinusoidal FM
wave.
Discuss the transmission bandwidth of FM wave.
11. State and prove Sampling theorem.
Discuss the Hartley Shannon Law.
Or
Explain PCM generation and Reconstruction.
12. Discuss the ASK modulator and Coherent ASK detector.
Or
Explain the Non-coherent PSK Detector.
Discuss the BPSK Modulator
———————
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