SRM University 2007 B.Tech Computer Science and Engineering BANK : Communication Engineering - Question Paper

21. Define threshold effect in FM.
22. Define signal to noise ratio in FM.
23. Define phase deviation.
24. Show that a LPF can be used as a discriminator.
25. An FM signal, modulated to a depth of 8,generates a bandwidth of 180khz.calculate the frequency deviation.
PART B
1. Explain Narrow band FM in detail.
2. Explain the generation of FM using Phase Modulator & generation of PM using frequency modulator.
3. Explain Armstrong method for FM generation.
4. Explain the FM generation using direct method.
5. With a neat diagram discuss ratio detector in detail.
6. Explain Slope detector with a neat diagram.
7. Explain the noise in angle modulated systems.
8. Explain FM transmitter using direct method.
9. Compare AM & FM.
10. Explain FM transmitter using indirect method.
11. Explain the principles of PLL with a neat block diagram.
12. Explain FM demodulation using PLL.
13. Explain the representation of narrow band & wide band FM.
14. Explain about foster-seely discriminator in detail.

UNIT 4
PART A
1. What is the advantage of digital modulation system?
2. What is PAM?
3. Define PAM, PDM.
4. Define Intersymbol interference.
5. What is eye pattern?
6. Define Companding?
7. Define TDM.
8. How synchronization is achieved in PAM
9. What are the measures taken to avoid Intersymbol interference?
10. What is pulse stuffing?
11. What is equalization?
12. Define Nyquist rate.
13. What is quantization error/noise?
14. Define Quantization.
15. Write down various kinds of quantizer?
16. Define sampling theorem.
17. What is aliasing?
18. Write down the advantage of PCM system?
19. What are the elements in a PCM system?
20. What is the transmission Bandwidth of PCM?
21. What are the noise in PCM ?
22. Define Quantization Noise.
23. What is the advantage of using Delta Modulation.
24. What are the kinds of noise in Delta modulation.
25. Compare PCM and DM.
PART B

1. Explain Low pass Sampling theorem.
2. Write short notes on Companding and Uniform quantization.
3. What is Quantization? discuss and derive an expression for signal to quantization noise ratio?
4. Explain TDM system with neat diagram.
5. Explain Delta Modulation System, elaborate the limitations? How can they be overcome.
6. Explain Adaptive delta Modulation System
7. Compare PCM, DPCM and DM.
8. With neat diagram discuss the elements in a PCM system.
9. Explain ISI and elaborate the necessary steps taken to avoid ISI
10. Explain Equalization and discuss the difference ranging from crosstalk and interference.
11. Describe DPCM system with neat diagram.
12. What is quantization error? How does it depends upon the step size? Suggest a few methods to overcome the difficulties encountered when the modulating signal amplitude swing is large.
UNIT V
PART-A
1. What is frequency range used for RADAR?
2. What are advantages of CW RADAR?
3. Mention any 2 application of CW RADAR?
4. What are the various kinds of RADAR systems?
5. Write the difference ranging from pulsed RADAR and CW RADAR?
6. Discuss the RADAR range formula.
7. What are the application of RADAR?
8. What is Television?
9. What is interlaced scanning?
10.What is image scanning?
11. Mention the function of colour killer circuit in TV receiver?
12. What is aspect ratio?
13. What is the horizontal and vertical scanning frequency in India?
14. What are luminance and chrominance signals?
15. Why VSB is used for TV?
16. What is bandwidth of TV system?
17. Compare the performance of various kinds of camera tubes?
18. What is meant by the resolution in a TV system?
19. Draw the frequency spectrum of a TV wave.
20. Give 2 advantages of Satellite communication.
21. What is geostationary Satellite?
22. What are the basic components of Satellite subsystem and earth station subsystem?
23. Name a few domestic Satellite.
24. Distinguish active and passive Satelite.
25. Define RADAR.
26. What is Doppler effect?
27. Draw the simple block diagram of pulse RADAR.
28. What is transponder in a Satellite system?
29. What is meant by frequency translation?
30. Specify the up and down link frequency range for Satellite communication.
31. What is need for optical fiber communication?
32. Enumerate the various kinds of losses in optical fiber.
33. Define Numerical Aperture.
34. Define single mode fiber.
35. What are the characteristics of LASER diode.
36. Define Attenuation of an optical fiber.
37. What are the advantages of optical fiber?
38. Define Snell’s legal regulations.
39. Classify various kinds of fiber.
40. What are the characteristics of LASER diode?

PART-B
1. With a block diagram discuss the operation of a monochrome TV receiver.
2. Describe the construction and working of a camera tubes.
3. Draw the block diagram of a colour tv receiver and define briefly its operation.
4. Explain the principle of operation of a TV transmitter.
5. Derive an expression for RADAR range formula.
6. Explain about pulsed radar system with block diagram.
7. Explain about Satellite subsystem with neat block diagram.
8. Explain about earth station subsystem with neat block diagram.
9. Discuss on the principle of light transmission in a fiber.
10. Draw the basic block diagram of an optical fiber communication link and discuss the function of different parts.























ques. BANK
EC211 - COMMUNICATION ENGINEERING

Earning:   Approval pending.