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Posted By: Sree.... Member Level: Diamond Posted Date: 09 Jul 2008
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2006 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech T.V. ENGINEERING Set No. 3 Question paper
Code No: RR410403 Set No. 3
IV B.Tech I Semester Supplementary Examinations, March 2006
T.V. ENGINEERING
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Justify the selection of 4:3 as the aspect ratio for TV system.
(b) Explain how the illusion of continuity is created in TV picture.
(c) What is interlaced scanning? Explain how it reduces both bandwidth and
flicker. [5+5+6]
2. (a) With a neat sketch, explain the principle of operation of a Trinitron color
picture tube.
(b) Discuss about some common faults in color picture tubes and associated cir-
cuitry and their causes. [8+8]
3. (a) Sketch the diagram of additive color mixing and state Grassman’s law.
(b) With necessary diagrams, explain the encoding of color difference signals.
[6+10]
4. (a) With a neat sketch, explain the effect of noise pulses with negative and positive
modulation.
(b) Explain with a neat sketch, why VSB is used for signal transmission in TV
system. [8+8]
5. (a) Draw block diagram of RF tuner and explain how incoming signals from dif-
ferent stations are translated to common PIF and SIF.
(b) What are the factors that influence the choice of IF in TV receivers. Explain
in brief. [8+8]
6. (a) With the help of circuit diagram, explain the principle of operation of forward
AGC.
(b) Explain the requirements of AGC circuit and what is the purpose of delayed
AGC. [8+8]
7. (a) With a neat circuit diagram explain the working of a sub carrier reference
oscillator.
(b) Draw the circuit of an ACC amplifier and explain its working. [10+6]
8. (a) Explain the operation of single - ended AFC circuit.
(b) Draw the block diagram of sync separator, AFC network and deflection circuits
of a television receiver. [10+6]
1 of 1
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