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Posted Date: 02 Jan 2009 Posted By: ravikanth Member Level: Diamond
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2006 Jawaharlal Nehru Technological University Electronics & Communications Engineering Code No: NR310403 NR III B.Tech I Semester Supplementary Examinations, November 2006 TV ENGINEERING Question paper
Code No: NR310403 NR
III B.Tech I Semester Supplementary Examinations, November 2006
TV ENGINEERING
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Define aspect ratio, contrast, brightness and resolution.
(b) How is flicker eliminated by using interlaced scanning?
(c) Derive the video bandwidth requirement for 625 line system. [4+6+6]
2. (a) Draw a picture frame chart showing the total number of active and inactive
lines during each field and explain the need for terminating the first field in a
half line and the beginning the second at the middle of a line at the top.
(b) Why is a portion of lower sideband of the AM picture signal transmitted along
with the Carrier and full USB?Does it need any correction some where in the
television link?6m
(c) What are the merits and demerits of VSB modulation. [6+5+5]
3. (a) Explain fully how a vidicon camera tube develops the video signal.
(b) Draw the light transfer characteristics of such a tube.
(c) Explain what do you understand by dark current that flows in the load resistance.
[6+5+5]
4. (a) What are the effects of atmospherics and obstacles on space waves? Why is
it necessary to keep both the transmitting and receiving antennas as high as
possible for television?
(b) List the salient requirements of TV broad cast transmission. [8+8]
5. Explain the practical video detector circuit which incorporates efficient IF filtering,
Suppression of harmonics, Separation of sound signals, Frequency compensation.
Give typical values of components. [16]
6. (a) Sketch and label the current waveforms that might flow in the deflection yoke
to produce a full raster. Explain the basic principles of generating such waveforms.
(b) How does impedance of driving source affect the wave shapes? [8+8]
7. (a) Explain the main characteristics of the human eye with respect to the perception
of colors.
(b) What is Y signal ? How it is composed ? What are the two major components
of the total color signals?
(c) Why different bandwidths are assigned to Q and I signals
8. (a) What is the significance of Y signal in color transmission and reception ?
(b) List the main characteristics of an NTSC colour system.
(c) Give the block diagram and explain the working of NTSC decoder
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