TELEVISION ENGINEERING
QUESTIONS AND ANSWERS
1. Aspect ratio is---------
a. 5/4, b. 2/4, c. 4/3, d. 3/2.
2. P/S ratio is---------
a. 10:2, b. 10:7, c. 4:3, d. 10:4.
3. Total line period is-------
a. 52µs, b. 61µs, c. 64µs, d.62µs.
4. Total frame period is--------
a. 50ms, b. 20ms, c. 25ms, d. 40ms.
5. Total active line period is---------
a. 12µs, b. 24µs, c. 52µs, d. 64µs.
6. Total retrace line time is-------------
a. 10µs, b. 12µs, c. 52µs, d. 64µs.
7. Total vertical trace period is-------
a. 20ms, b. 18.720ms, c. 1.280ms, d. 18ms.
8. Total vertical retrace period is-------
a. 18.720ms, b. 1.280ms, c. 25ms, d. 20 ms.
9. Total no. of scanning lines in Indian TV system are-----
a. 525 lines, b. 625 lines, c. 718 lines, d. 312.5 lines.
10. Total no. of scanning lines in each fields are----
a. 625 lines, b. 312.5 lines, c. 525 lines, d. 313 lines.
11. How many lines are lost during the vertical retrace?
a. 25 lines, b. 20 lines, c. 5 lines, d. 312.5 lines.
12. Equalizing pulses are of length------
a. 10 lines, b. 5 lines, c. 20 lines, d. 10 lines.
13. Duration of the back porch is-----
a. 64µs, b. 4.7µs, c. 5.8µs, d. 12µs.
14. Duration of front porch is------
a. 12µs, b. 5.8µs, c. 1.5µs, d. 4.7µs.
15. Duration of Horizontal sync pulses are------
a. 12µs, b. 1.5µs, c. 5.8µs, d. 4.7µs.
16. Horizontal blanking period is of -------
a. 64µs, b. 52µs, c. 12µs, d. 10µs.
17. Visible line time is------
a. 64µs, b. 52µs, c. 12µs, d. 62µs.
18. Total no. of active lines are--------
a. 625 lines, b. 585 lines, c. 540 lines, d. 620 lines.
19. Highest modulating frequency is ----
a. 10 MHz, b. 5MHz, c. 7MHz, d. 2.5 MHz.
20. Line frequency is ---
a. 50 Hz, b. 15625 Hz, d. 31250 Hz, d. 5 MHz.
21. Field frequency is ------
a. 50 Hz, b. 15625 Hz, d. 31250 Hz, d. 5 MHz.
22)The ability of image reproducing system to represent fine structure of object is known as _________
a) aspect ratio b) resolution c) image continuity d) none
23)The No. of active lines presented in one frame is
a) 625 b) 400 c) 585 d) 533
24)The vertical retrace is completed in_______ µsec.
a) 64 b) 160 c) 280 d) 1280
25)During vertical retrace period_____ Horz. Lines are get scanned for frame.
a) 20 b) 40 c) 30 d) 50
26)The horz.line retrace period is____ µsec
a) 4.7 b) 5.8 c) 12 d) 10
27)The principle of silicon diode array vidicon camera tube is
a) photo emission b) photo conduction c) photo voltaic d) none
28)The principle of vidicon camera tube is
a) photo emission b) photo conduction c) photo voltaic d) none
29)In modern B&W picture tube employs ____ deflection
a) electro static b) electro magnetic c) both d) none
30)The combination of Horz. and vertical deflection coils are called
a) beam deflection b) deflection yoke c) deflection angle d) none
31)The size of picture tube is measured based on its ________
a) width b) diagonal c) height d) none
32)In T.V system which transmission is preferred
a) VSB b) DSBFC c) SSB d) DSBSC
33)In 525 lines T.V system the standard channel B.W is ______ M Hz.
a) 7 b) 5 c) 6 d) 8
34)Which type of propagation is preferred in T.V. system
a) ground wave b) sky wave c) space wave d) none
35)In T.V system the transmitting antenna polarization is
a) Horizontal b) vertical c) circular d) elliptical
36)In all T.V system the aspect ratio is
a) 3:4 b) 4:3 c) 5:4 d) 4:5
37)The compliment colour for blue is
a) magenta b) yellow c) cyan d) red
38) Expand PAL phase alternation by line
39) NTSC Colour system is compatible to the 525 lines B&WT.V system.
40) What is advantage of PAL colour system.
Phase errors are automatically cancelled to each other.
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