Anna University Chennai 2005 B.E Electrical and Electronics Engineering Fourrth Semester - Question Paper

MODEL PAPER
B.E. DEGREE exam.
EC 256Fourrth Semesterth
Electrical and Electronics Engineering
— COMMUNICATION ENGINEERING
(Common to Electronics and Instrumentation Engineering and Instrumentation and
Control Engineering)
Time : 3 hours Maximum : 100 marks
ans ALL ques..
PART A — (10 ? two = 20 marks)
1. State the primary mode of microwave propagation? What factors determine the
range of it?
2. describe (a) Passive Satellite (b) Active Satellite.
3. describe Nyquist sampling rate.
4. What is the operation of a Compander?
5. What is meant by coherent reception in data transmission?
6. How the probability of fault can be decreased in data transmission?
7. elaborate the advantages of fiber optics over wire systems?
8. describe characteristic impedance of a cable.
9. elaborate the video and audio IF carrier frequencies?
10. describe (a) luminance signal (b) chrominance signal.
PART B — (5 ? 16 = 80 marks)
11. provide a detailed comparison of (i) data transmission systems (ii) digital
modulation systems.
12. (a) discuss the direct method of FM generation.
Or
M 082
2 M 082
WSS
(b) Draw the block diagram of an AM superheterodyne radio receiver and
discuss the function of every block.
13. (a) discuss in detail :
(i) Quantization
(ii) Companding
with regard to pulse code modulation scheme.
Or
(b) (i) define the slope overload fault and the ways to minimize it.
(ii) Compare the different pulse modulation schemes.
14. (a) discuss in detail about TDM.
Or
(b) discuss the essential components of an optical communication system.
15. (a) Sketch the block diagram of a monochrome television receiver and
explain.
Or
(b) (i) discuss interlaced scanning.
(ii) Sketch the electron gun in a typical CRT. discuss briefly how the
electron beam is focussed.
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Earning:   Approval pending.