This is the Multiple Choice Questions in Chapter 19: Television from the book Electronic Communication Systems by Roy Blake
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
MULTIPLE CHOICE
1. NTSC stands for:
- a. National Television Systems Commission
- b. National Television Systems Committee
- c. National Television Systems Council
- d. Nippon Television Systems Commission
ANS: B
2. The NTSC specification was drawn up by the:
- a. FCC
- b. IRE
- c. EIA
- d. IEEE
ANS: C
3. RGB stands for:
- a. Red-Green Burst
- b. Red-Green Brightness
- c. Red-Green Bandwidth
- d. Red-Green-Blue
ANS: D
4. The number of scan lines in an NTSC signal is:
- a. 525
- b. 625
- c. 1024
- d. 1250
ANS: A
5. The number of NTSC frames sent per second is:
- a. 25
- b. 30
- c. 50
- d. 60
ANS: B
6. The number of NTSC fields sent per second is:
- a. 25
- b. 30
- c. 50
- d. 60
ANS: D
7. The aspect ratio of a standard TV receiver is:
- a. 3 : 4
- b. 4 : 3
- c. 525 : 625
- d. 625 : 525
ANS: B
8. Luminance refers to:
- a. brightness
- b. contrast
- c. chroma
- d. raster
ANS: A
9. Luminance is measured in:
- a. foot-candles
- b. lumins
- c. IRE units
- d. NTSC units
ANS: C
10. The maximum luminance level is called:
- a. max white
- b. peak white
- c. all white
- d. whiter than white
ANS: B
11. The blanking level corresponds to a luminance of:
- a. white
- b. black
- c. whiter than white
- d. blacker than black
ANS: B
12. The sync pulse level corresponds to a luminance of:
- a. white
- b. black
- c. whiter than white
- d. blacker than black
ANS: D
13. The vertical blanking pulse is serrated to:
- a. maintain horizontal sync
- b. maintain vertical sync
- c. equalize the DC level
- d. all of the above
ANS: A
14. When measured in lines, horizontal resolution:
- a. is greater than vertical resolution
- b. is about the same as vertical resolution
- c. is less than vertical resolution
- d. horizontal resolution is not measured in lines
ANS: B
15. The smallest picture element is called a:
- a. dot
- b. pic
- c. pixel
- d. none of the above
ANS: C
16. In a color TV receiver, Y I Q refers to:
- a. luminance signal, in-phase color component, quadrature phase color component
- b. composite color signal, in-phase color component, quadrature phase color component
- c. composite video signal, in-phase video component, quadrature video color component
- d. a method of demodulating stereo sound
ANS: A
17. Compared to the luminance signal, the horizontal resolution for color is:
- a. much greater
- b. about the same
- c. much less
- d. resolution does not apply to color
ANS: C
18. The modulation used for the video signal in a standard NTSC color TV receiver is:
- a. SSB
- b. vestigial sideband AM
- c. suppressed-carrier AM
- d. FM
ANS: B
19. The modulation used for the audio signal in a standard NTSC color TV receiver is:
- a. SSB
- b. vestigial sideband AM
- c. suppressed-carrier AM
- d. FM
ANS: D
20. The modulation used for the chroma signal in a standard NTSC color TV receiver is:
- a. SSB
- b. vestigial sideband AM
- c. suppressed-carrier AM
- d. FM
ANS: C
21. The function of the "color burst" is to:
- a. detect the presence of a color video signal
- b. regenerate the color sub-carrier
- c. to synchronize the color demodulation line by line
- d. all of the above
ANS: D
22. SAP stands for:
- a. separate audio program
- b. separate audio pulse
- c. sync amplitude pulse
- d. sync audio pulse
ANS: A
23. The horizontal output transformer is also called:
- a. the isolation transformer
- b. the video transformer
- c. the flyback transformer
- d. the yoke
ANS: C
24. Compared to a monochrome CRT, the accelerating voltage on a color CRT is:
- a. about the same
- b. much higher
- c. much lower
- d. color CRTs use magnetic acceleration
ANS: B
25. Deflection in CRTs used in TV receivers is done:
- a. magnetically for both vertical and horizontal
- b. electrostatically for both vertical and horizontal
- c. electrostatically for vertical and magnetically for horizontal
- d. magnetically for vertical and electrostatically for horizontal
ANS: A
26. AFPC stands for:
- a. allowed full picture chroma
- b. automatic frequency and phase control
- c. automatic frequency and picture control
- d. none of the above
ANS: B
COMPLETION
1. ____________________ is a conductive coating on both the inside and outside of the CRT in a TV.
ANS: Aquadag
2. The ____________________ standard for TV has been in use since 1953.
ANS: NTSC
3. Video systems form pictures by a ____________________ process.
ANS: scanning
4. During the horizontal blanking interval, the electron beam ____________________ from right to left.
ANS: retraces
5. The NTSC specifies a ____________________ video signal.
ANS: composite
6. The ____________________ ratio of a CRT screen is the ratio of width to height.
ANS: aspect
7. Brightness information is called ____________________.
ANS:
luma
luminance
8. Color information is called ____________________.
ANS:
chroma
chrominance
9. The blanking period before the sync pulse is called the front ____________________.
ANS: porch
10. Odd and even fields are identified by the ____________________ of the vertical sync pulse.
ANS: position
11. Each horizontal scan line takes ____________________ microseconds, not including blanking.
ANS: 62.5
12. Horizontal blanking lasts ____________________ microseconds.
ANS: 10
13. Vertical blanking lasts about ____________________ milliseconds.
ANS: 1.3
14. Picture elements are called ____________________.
ANS: pixels
15. The maximum number of scan lines under NTSC is ____________________.
ANS: 525
16. The human eye is most sensitive to the color ____________________.
ANS: green
17. The color sub-carrier frequency is approximately ____________________ MHz.
ANS: 3.58
18. SAP stands for ____________________ audio program.
ANS: separate
19. The second anode of a CRT is often called the ____________________.
ANS: ultor
20. The accelerating voltage for a color CRT is about ____________________ kV.
ANS: 20 to 30
21. The inside of a CRT's face-plate is coated with ____________________ to generate the picture.
ANS: phosphor
22. The horizontal output transformer is called the ____________________ transformer.
ANS: flyback
23. A good way to separate luma from chroma is to use a ____________________ filter.
ANS: comb
24. The color ____________________ turns off the color circuitry when a color TV is receiving a monochrome signal.
ANS: killer
25. Signal levels in cable TV systems are usually measured in ____________________.
ANS: dBmV
26. The antenna for a CATV system is located at the ____________________ end.
ANS: head
27. A ____________________ shows a color-bar signal with predetermined levels and phases.
ANS: vectorscope
28. Color intensity is called ____________________.
ANS: saturation
29. The ____________________ of the chroma signal represents the color hue.
ANS: phase
30. The ____________________ controls in a color TV adjust the electron beams to strike the correct color phosphor dots.
ANS: purity
31. The ____________________ controls in a color TV adjust the electron beams to strike the correct triad of phosphor dots.
ANS: convergence
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