SRM University 2007 B.Tech Electronics and Communications Engineering BANK : EC200 ANALOG COMMUNICATION - Question Paper

9. Draw the circuit diagram of ratio detector and discuss its operation .What is the advantage of this over Foster – Seeley discriminator?
10. Explain the Single tuned detector with its demerits.
11. Explain the Balance slope detector with a neat block diagram.
12. Explain the method of FM generation using Reactance tube modulator.

UNIT – III (TV & RADAR)_
PART - A
1. What is the function of colour killer circuit in TV receiver?
2. What is luminance signal?
3. What is Chrominance signal?
4. What is the function of synchronizing pulses?
5. What is the purpose of contrast control in TV receiver?
6 What is the B.W of T.V system in India?
7 Draw the frequency spectrum of TV signals.
8 What is meant by the resolution of TV screen?
9 What are the various kinds of camera tube available?
10 Why VSB is used the Television?
11 Write the acronym for NTSC & PAL in TV system.
12 Define Kell factor.
13 What is meant by compatibly in TV system?
14 Define aspect ratio.
15 What is persistence of vision in eye?
20. What is meant by Doppler Effect?
21. Write Radar range formula.
22. What is the function of RADAR?
23. What is image continuity in TV?
24. Write the various kinds of RADAR.
PART – B
1. Describe the working of colour TV receiver.
2. Discuss the synchronization pulses used in TV.
3. Explain different kinds of scanning of TV.
4. Describe the construction and working of TV camera.
5. Draw the block diagram of color TV receiver and define briefly its operation.
6. Describe the operation of vidicon camera tube.
7. With the block diagram discuss the monochrome TV receiver.
8. Derive the Radar range formula.
9. Explain in detail pulse Radar system.
10. Explain basic operation of Radar system.


UNIT – IV (NOISE THEORY)
PART - A
1. describe a noise.
2. What are the classification of noise?
3. What is thermal noise?
4. Define shot noise.
5. What is external noise?
6. What is internal noise?
7. What are the sources for the noise?
8. Draw power density spectrum of shot noise.
9. What is man made noise?
10. What is atmospheric noise?
11. What is white noise?
12. Explain noise band width.
13. Write frits formula?
14. Define noise temperature.
15. What is meant by figure of merit?
16. What is meant by threshold effect in receiver?
17. Define signal to noise ratio.
18. Explain noise figure.
19. Define noise spectral density.
20. What do you understand by the term available power?
21. What is the meaning of effective noise temperature?
22. Define narrow band noise.
23. Define available power gain in 2 port network.
24. Compare Internal & External noise?
25. Define Johnson noise.
26. Define white noise.

PART - B
1. Write in detail about the sources of noise and provide examples.
2. compute noise power in a linear system that is affected by single noise source and multiple noise source.
3. Find out the available power in R – L – C Network.
4. Write a short note on
1) Noise temperature.
2) Noise Figure.
5. Explain the impact of noise in 2 port network.
6. What do you understand the “SIGNAL IN PRESENCE OF NOISE”?
7. Explain narrow band noise.
8. Explain noise band width in detail.

UNIT – V (RADIO TRANSMITTER AND RECEIVER)
PART - A
1. What is low modulation & high level modulation?
2. describe frequency scintillation.
3. Define neutralization.
4. Define heterodyning.
5. Write steps involved to keep master oscillator frequency stable.
6. Define selectivity, sensitivity & fidelity.
7. Write advantage of superheterodyue receiver.
8. Define pre-emphasis & de-emphasis.
9. Write the features of broadcast receiver.
10. What factors govern option of IF frequency for FM receiver?
11. Define image rejection ratio.
12. Why class- C amplifiers used in high power transmitter?
13. How transmitter is classified based on frequency?
14. What is need for AGC in radio receiver?
15. What is the use of frequency mixer stage in a radio receiver?
16. List features given in a communication receiver? Compare to conventional radio receiver?
17. What is the advantage of using double conversion in receiver?
18. What is the use of Noise limiter?
19. Define image frequency.
20. Draw AGC characteristics.
21. What are the different kinds of AGC available?

PART - B
1. Explain TRF receiver with block diagram & provide its advantage and disadvantage.
2. Explain super heterodyne AM receiver with image rejection.
3. Explain Automatic Gain Control with circuit diagram.
4. Explain Automatic Frequency Control with suitable diagram.
5. Explain double super heterodyne FM receiver with suitable diagram.
6. Explain the operation of High Frequency Communication receiver.
7. Write a short note on
a) Image rejection.
b) Noise limited.

8. Explain features of subsequent in radio transmitter
a) Master Oscillator.
b) Harmonic generator.
c) Neutralization Technique.

9. Explain operation of ISB transmitter

10. Write notes on
a) Adjacent Channel selectivity.
b) Ganging & Tuning.

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EC200- Analog Communications


ques. Bank

Earning:   Approval pending.