30-10-2012, 12:54 PM
IV B.Tech I Semester Supplimentary Examinations - T.V. ENGINEERING
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1. (a) Differentiate between a monochrome and color TV camera tubes.
(b) With a construction diagram, explain the working principle of a Plumbicon
camera tube. [6+10]
2. (a) Tabulate the specifications of any two standard picture tubes.
(b) Explain why ion traps are used in picture tubes. With neat diagrams explain
about ion trap mechanisms. [6+10]
3. (a) Explain how G-Y is obtained in the receiver for modulating corresponding
beam of picture tube.
(b) Draw the resistance matrix for obtaining ‘Y’ signal and circuit blocks for
obtaining color difference signals. Explain in brief. [8+8]
4. (a) What are the limitations of NTSC system.
(b) Explain why color difference signals in NTSC color system are modified to
become I&Q signals. Why is the value of color sub carrier frequency is fixed
at 3.579545 MHz in NTSC system. [6+10]
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) What are the functions performed by a TV receiver tuner.
(b) Explain the block diagram of a Varactor tuned UHF tuner. [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) With a neat circuit diagram explain the transistor vertical output stage driven
by a multivibrator oscillator.
(b) Write short notes on digital terrestrial TV.