The Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part II of the Series
Choose the letter of the best answer in each questions.
51. The R, G, and B video drive controls are set for ________ in the picture.
- A. dark gray
- B. white
- C. black
- D. green
52. Background controls of many picture tubes are for the
- A. ac bias
- B. dc bias
- C. ac video signal
- D. dc video signal
53. The G2 master screen control of picture tubes vary the
- A. ac voltage
- B. dc voltage
- C. ac video signal
- D. dc video signal
54. In the sawtooth waveform for linear scanning
- A. the linear rise if for flyback
- B. the complete cycle includes trace and retrace
- C. the sharp reversal in amplitude produces trace
- D. the beam moves faster during trace than retrace.
55. Given a 635 us vertical retrace time, the number of complete horizontal lines scanned during vertical flyback is
- A. 10
- B. 20
- C. 30
- D. 63
56. One-half line spacing between the start position for scanning even and odd fields produces
- A. linear scanning
- B. line pairing
- C. fishtailing
- D. exact interlacing
57. The number of lines scanned per frame in the raster on the picture tube screen is
- A. 525
- B. 262
- C. 20
- D. 10
58. In the frame for which interlaced scanning is used, alternate lines are skipped during vertical scanning because
- A. the trace is slower than the retrace
- B. the vertical scanning frequency is doubled from 30 to 60 Hz
- C. The horizontal scanning is slower than vertical scanning
- D. the frame has a 4 : 3 aspect ratio
59. If the horizontal flyback is 10 percent, this time equals
- A. 10 us
- B. 56 us
- C. 6.4 us
- D. 83 us
60. Which of the following is NOT true?
- A. line pairing indicates poor interlacing.
- B. People look too tall and too thin on a square raster on the picture tube screen.
- C. A person can appear to have one shoulder wider than the other because of nonlinear horizontal scanning.
- D. the keystone effect produces a square raster.
61. The width of a vertical sync pulse with its narrations includes the time of
- A. six half-lines, or three lines
- B. five lines
- C. three half-lines
- D. five half-lines
62. Sawtooth generator circuits produce the scanning raster, but the sync pulses are needed for
- A. linearity
- B. timing
- C. keystoning
- D. line Pairing
63. Which of the following frequencies is wrong?
- A. 15,750 Hz for horizontal sync and scanning
- B. 60 Hz for vertical sync and scanning
- C. 31,500 Hz for equalizing pulses and serrations in the vertical sync pulses
- D. 31,500 Hz for the vertical scanning frequency
64. Which of the following is faster in horizontal scanning?
- A. trace
- B. retrace
- C. flyback
- D. retrace or flyback
65. Which of the following takes more time?
- A. H retrace
- B. H trace
- C. V retrace
- D. V trace
66. What does an interlaced scanning require for the number of the horizontal lines?
- A. odd
- B. Even
- C. Both odd and even simultaneously
- D. Either odd or even
67. How many horizontal lines are in the odd or an even field?
- A. 10 ½
- C. 525 lines
- B. 262 ½ lines
- D. 600 lines
68. How many H lines are there in a complete frame?
- A. 19 lines
- B. 21 lines
- C. 262 ½ lines
- D. 600 lines
69. How many H lines are there in each field?
- A. 8 ½ lines
- B. 10 ½ lines
- C. 262 ½ lines
- D. 325 lines
70. How many H lines are there in each V retrace?
- A. One
- B. two
- C. three
- D. four
71. What are the frequencies of V scanning, V sync, and V blanking?
- A. 30 Hz
- B. 60 Hz
- C. 90 Hz
- D. 360 Hz
72. What are the frequencies of H scanning, H sync and H blanking?
- A. 15,750 Hz
- B. 16,750 Hz
- C. 31,500 Hz
- D. 30,050 Hz
73. In video signal analysis, what are the three parts of the composite video signal, for two horizontal lines in the picture?
- A. Camera signal
- B. H sync C. H blanking
- C. H blanking
- D. all of the above
74. In the IRE scale for composite video signal, list the number of IRE units used for sync, black setup, and the camera signal?
- A. 40, 7.5, 92.5 respectively
- B. 92.5, 40, 7.5 respectively
- C. 7.5, 40, 92.5 respectively
- D. 92.5, 7.5,40 respectively
75. What are the approximate time periods for the width of H blanking pulse in microseconds?
- A. 5
- B. 0.93
- C. 10.2
- D. 53.5
76. What are the approximate time periods for the visible H trace?
- A. 5
- B. 0.93
- C. 10.2
- D. 53.5
77. What are the approximate time periods for the width of H sync pulse?
- A. 5
- B. 0.93
- C. 10.2
- D. 53.5
78. Which pulses in V blacking correspond to the 3H lines wide?
- A. V sync
- B. V blanking
- C. Equalizing
- D. all of the above
79. Which pulses in V blanking correspond to the 21H lines wide?
- A. V sync
- B. V blanking
- C. Equalizing
- D. all of the above
80. Which pulses in V blacking correspond to the 31,500 Hz?
- A. V sync
- B. V blanking
- C. Equalizing
- D. all of these
81. Give the maximum number of picture details for each horizontal line.
- A. 338
- B. 426
- C. 125,000
- D. 144,000
82. Give the maximum number of picture details for total picture area.
- A. 338
- B. 426
- C. 125,000
- D. 144,000
83. The average dc level is close to the blanking level for a scene?
- A. light
- B. dark
- C. either dark or light
- D. neither dark nor light
84. In what condition does the picture tube reproduce black?
- A. maximum beam current
- B. minimum beam current
- C. zero beam current
- D. none of these
85. The gamma effects the of the picture tube.
- A. contrast
- B. Brightness
- C. dullness
- D. either the brightness or contrast
86. Picture tube has games which is .
- A. greater than 1
- B. less than 1
- C. infinity
- D. zero
87. Brightness variations of the picture information are in which signal?
A. 1
B. Q
C.Y
D. R-Y
88. The hue 180º out of phase with red is
- A. cyan
- B. yellow
- C. green
- D. blue
89. Greater p-p amplitude of the 3.58MHz chrominance signal indicates more
- A. white
- C. hue
- B. yellow
- D. saturation
90. The interfering beat frequency of 920 kHz is between the 3.58 MHz color subcarrier and the
- A. 4.5 MHz intercarrier sound
- B. picture carrier
- C. lower adjacent sound
- D. upper adjacent picture
91. The hue of color sync phase is
- A. red
- B. cyan
- C. blue
- D. yellow-green
92. Which signal has color information for 1.3 MHz bandwidth?
- A. I
- B. Y
- C. R-Y
- D. B-Y
93. Which of the following is false?
- A. the I video hues are orange or cyan
- B. The transmitter matrix output includes Y, I, and Q video
- C. A three-gun picture tube that can serve as a matrix.
- D. a fully saturated color is mostly white
94. The color with the most luminance is
- A. red
- B. yellow
- C. green
- D. blue
95. What is the hue of a color 90º leading sync burst phase?
- A. yellow
- B. cyan
- C. Blue
- D. Orange
96. The average voltage value of the 3.58 MHz modulated chrominance signal is
- A. zero for most colors
- B. close to black for yellow
- C. the brightness of the color
- D. the saturation of the color
97. The second IF value for color in receivers, for any station, is
- A. 0.5 MHz
- B. 1.3 MHz
- C. 3.58 MHz
- D. 4.5 MHz
98. if the 3.58-MHz C amplifier in the receiver does not operate, the result will be
- A. no color
- B. no red
- C. too much blue
- D. too much yellow
99. How many octaves is the frequency range 1 to 8MHz?
- A. 1
- B. 2
- C. 3
- D. 8
100. Which system can be used for both recording and playback?
- A. CEO
- B. VHD
- C. Laser disk
- D. VHS
Post a Comment
EmoticonClick to see the code!
To insert emoticon you must added at least one space before the code.