UNIV4VINU | ENGINEERING ACHIEVERS

B.E./B.Tech. DEGREE EXAMINATION,

Fourth Semester

Information Technology

IF 252 — TELECOMMUNICATION SYSTEMS

Time : Three hours Maximum : 100 marks

Answer ALL questions.

PART A — (10 x2 = 20 marks)

1. What is modulation index?

2. What is fading?

3. What is a Telepoint System?

4. What is Half Duplex?

5. What is a Geo Synchronous satellite?

6. What are Azimuth and Elevation angles?

7. What is a Graded Index Fibre?

8. What is WDM?

9. What is a DTMF System?

10. What is GSM and TDMA?

PART B — (5 x 16 = 80 marks)

11. (i) Define Sensitivity and Selectivity of a receiver. (4)

(ii) What is Image Frequency? Explain. (6)

(iii) Draw the block diagrams of FDM Transmitter and Receiving End. (6)

12. (a) (i) Explain the operation of a cordless telephone. (6)

(ii) Explain in detail the operation of an advanced Mobile Phone System. ( 10)

Or

(b) (i) Draw the block diagram of an Analog Cell Phone. (6)

(ii) Explain in detail the operation of a Cellular Radio System. (10)

13. (a) Write a detailed note about Satellite Orbits and Geo-Synchronous Satellites.

Or

(b) Explain in detail an Earth Station, with a neat block diagram.

14. (a) Explain in detail the various types of fiber optic cables, its construction and its

characteristics.

Or

(b) Explain in detail the optical transmitters and receivers used in Fiber Optical

Communication.