TV QUESTIONS1. Which of the following camera/camcorder pickup devices is used most often? Ans. CCD2. The three primary signals used in color television are. ANS: red, green, blue3. The standard composite-video output signal is ANS: 1 Vp-p with negative sync4. Standard composite video output impedance is ANS: 75 ohms5. A typical diagonal measurement for a CCD pickup is ANS: 1/3 inch6. Which of the following is not an advantage of the CCD pickup device? ANS: requires high voltage with low current7. Video, signal, blanking, and sync pulses together are known as ANS: composite video8. CCD pickups use ANS: photodiodes9. The human eye does not respond to visible light equally; it peaks at ANS: yellow-green10. The wavelength of light is measured in ANS: nanometers11. Video special effects and production switching are done by the ANS: SEG12. The gamma of a picture tube is

ANS: 2.213. The luminance signal is also known as the

ANS: Y signal14. Which of the following values of focal length would be best for a telephoto lens? ANS: 200mm

15. A cyan filter will pass ANS: blue and green16. A combination of a video camera, a video-tape recorder, and a viewfinder is known as a ANS: Camcorder17. A Macro position of a lens allows for taking ANS: close up shots18. 140 IRE units are equal to ANS: 1 Vp-p19. In the sawtooth waveform for linear scanning

ANS: the complete cycle includes trace and retrace20. Given a 635us vertical retrace time, the number of complete horizontal lines scanned during vertical flyback is ANS: 1021. One-half line spacing between the start positions for scanning even and odd fields produces ANS: Exact interlacing22. In the frame for which interlaced scanning is used, alternate lines are skipped during vertical scanning because ANS: vertical scanning frequency is doubled from 30 to 60 Hz.23. If the horizontal flyback is 10 percent, this time equals ANS: 6.4us24. Which of the following is not true? ANS: the keystone effect produces a square raster.25. The width of a vertical sync pulse with its serrations includes the time of ANS: six half lines, or three lines;26. Sawtooth generator circuits produce the scanning raster, but the sync pulses are needed for ANS: Timing27. Which of the following frequencies is wrong? ANS: 31, 500 Hz for the vertical scanning frequency28. The resolution of a monitor is its ANS: ratio of horizontal pixels to vertical pixels29. Close-spacing of the color dots in the CRT, progressive scanning, and higher sweep rates results in ANS: more resolution of the monitor30. Most computer monitors use ANS: Progressive scanning31. Most computer monitors do not require ANS: tuned RF stages32. Brightness variations of the picture information are in which signal? ANS: Y33. The hue 180 degrees out of phase with red is ANS: Cyan34. Greater p-p amplitude of the 3.58Mhz chrominance signal indicates more ANS: saturation35. The interfering beat frequency of 920 Khz is between the 3.58Mhz color subcarrier and the ANS: 4.5Mhz intercarrier sound36. The hue color sync phase is ANS: yellow-green37. The hue color sync pulse is ANS: yellow-green38. Which signal has color information for the 1.3Mhz bandwidth ANS: I39. Which of the following is false? ANS: a fully saturated color is mostly white

40. The color with the most luminance is ANS: yellow41. What is the hue of a color 90 degrees leading sync burst phase? ANS: Cyan42. The average voltage value of the 3.58Mhz modulated chrominance signal is ANS: the brightness of the color43. The second IF value for color in receivers for any station is ANS: 3.58MHz44. If the 3.58MHz C amplifier in the receiver does not operate, the results will be ANS: no color45. S-video separates the video signals into ANS: Y and C signals46. A color matrix adder combines Y with ANS: R Y47. A high quality filter that produces better separation of the Y and C signals is a ANS: COMB filter48. The 3.58Mhz color subcarrier is ANS: a double sideband suppressed carrier signal49. The luminance signal for white is composed of ANS: .30R + .59G + .11B50. How many octaves is the frequency range of 1 to 8Mhz ANS: 351. Which system can be used for both recording and playback? ANS: VHS52. How many TV fields are recorded on one slant track tape? ANS: 153. The video heads rotate at high velocity to increase the ANS: writing speed

54. A typical frequency for the FM luminance signal in VCR recording is ANS: 3.58Mhz55. Which of the following applies to the color-under technique? ANS: Chroma frequency are reduced56. What oscillator frequency is needed to heterodyne 629 kHz up to 3.58Mhz ANS: 3 Mhz57. A comb filter is used to ANS: cancel chroma crosstalk58. Switching for each field is required for the ANS: video heads59. Servocontrol of speed and phase is used for the ANS: video head scanner60. The part that rotates to meter out the tape at constant speed is the ANS: Capstan61. To make the tape speed the same in playback as in recording, the tape speed is regulated by the ANS: control track pulse62. Tilting the video head gaps is necessary with the ANS: zero guard bands63. Which system uses a laser light beam for playback? ANS: DVD64. Which digital videodisk uses a 120 mm (approximately 5 in.) disk? ANS: DVD65. Composite video and audio jacks on the back of a VCR or videodisk player are of which type? ANS: RCA66. Component video output jacks separate the C signal into ANS: R Y , B Y67. VHS video heads rotate at ANS: 1800 rpm68. S-video separates the video signal into ANS: Y, C69. Closed systems that maintain correct cylinder speed and capstan speed, and select the proper play speed setting are ANS: servo systems70. Hi-Fi audio recordings use ANS: spinning audio heads71. Much of the information from one frame to the next remains the same. Digital video systems take advantage of this fact by using a data-reduction system known as ANS: compression72. A DVD videodisk can store up to

ANS: 4.7 Gb on a single layer73. DVDs use 6 or 8 channel sound audio systems, known as ANS: AC3 or MPEG-274. Letter-box aspect ratio is ANS: 16:975. The modulated picture carrier wave includes the composite video signal as the ANS: symmetric envelope of amplitude variations

76. Which of the following statements is true? ANS: Negative transmission means that the carrier amplitude decreases for white

77. With a 2 MHz video signal modulating the picture carrier signal for channel 4 (66 to 72 MHz), which of the following frequencies are transmitted? ANS: 67.25MHz carrier frequency and 69.25 MHz upper side frequency.78. With a 0.5-MHz video signal modulating the picture carrier ANS: both upper and lower side frequencies are transmitted

79. In all standard television broadcast channels, the difference between the picture and sound carrier frequencies is ANS: 4.5MHz

80. The difference between the sound carrier frequencies in two adjacent channels is ANS: 6 MHz

81. Line of sight transmission is a characteristic of propagation for the ANS: VHF band and higher frequencies

82. In channel 14 (40 to 476 MHz), the 3.58MHz color signal is transmitted at ANS: 474.83MHz

83. The difference between the sound carrier and color subcarrier frequencies is ANS: 0.92 MHz

84. The maximum deviation of the FM sound signal, in kilohertz is ANS: 25 KHz85. Television stereo sound is known as ANS: MTS

86. The color signal is transmitted as ANS: a double sideband, suppressed carrier signal

87. UHF television stations are allowed to transmit ANS: more88. Which of the followingis a midband TV channel? ANS: A or 14

89. Coaxial cable for distribution system has an impedance of ANS: 75 ohms

90. The cable converter output for the TV receiver is usually on channel ANS: 3

91. The VSWR for line terminated in its Zo is ANS: 1

92. How many dBmV units correspond to 1mV signal level? ANS: 093. A tap for the subscriber drop line has a ANS: high insertion loss

94. The most popular plug for 75 ohms coaxial cable is the ANS: F-connector

95. Which of the following is true? ANS: a weak signal causes snow in the picture96. What is the typical value for the IF signal, in megahertz, for up-down cable converters? ANS: 612.75

97. For in-band descramblers, the decoding pulses are sent on the ANS: sound carrier98. The refraction value of light in a vacuum isANS: 1

99. Which of the following is an MMDS wireless cable TV frequency? ANS: 2.6 GHz

100. Which of the following components is not part of a parabolic satellite dish? ANS: a transponder101. An antenna is at resonance when its inductive reactance is equal to its ANS: capacitive reactance

102. Increased antenna gain is accompanied by a corresponding decrease in ANS: beamwidth

103. Standard television antennas in the United States are polarized ANS: horizontally104. A half wave dipole antenna is designated so that impedance will be lowest at ANS: its midpoint

105. The driven element in a typical parasitic antenna array is the ANS: dipole

106. The part of a coaxial that carries an RF signal is the ANS: core conductor

107. Mismatched impedance will cause a transmission lines standing wave ratio to ANS: increase

108. A Balun can be used to ANS: match impedances

109. A transmission line made of coaxial cable should be kept at least four inches from ANS: NONE OF THIS (antenna mast, gutters, aluminum window frames)

110. A signal amplifier can compensate for ANS: transmission line losses

111. A leakage test examines ANS: leakage current

112. Both the test equipment and the device being serviced must be plugged into the isolation transformer ANS: false

113. A leakage current sufficient to cause a .75-V drop across a 1,500 ohm resistor is considered ANS: dangerous

114. A full wave rectified power supply grounded to the chassis places the chassis at ____ volts above ground ANS: 60 volts

115. Service literature is available from ANS: both a and b (manufacturers and private publishers)

116. Effective symptom diagnosis requires the knowledge of the ____ equipment being repaired ANS: block diagram

117. The most often found defect is with ANS: mechanical devices

118. One type of device (other than a power active device) that is in the most likely to fail list is ANS: small electrolytic capacitors

119. Any resistance in parallel with another resistance will___ the total resistance. ANS: lower

120. The E-B voltage of 0.7V ___ a perfect indicator of whether the transistor is properly conducting or not ANS: IS NOT

121. To turn on a transistor, in circuit, the base is ANS: tied to the C by 10 K ohms

122. In a circuit with a resistor in parallel with a capacitor, the voltage drop across the pair is near 0V. Current is going through the circuit. What is most likely wrong? ANS: a shorted C

123. Most service tests require ANS: both a and b (DVOM , oscilloscope)124. Measuring TV high voltage requires ANS: a special HV probe

125. A delayed sweep scope allows the user to view a very small part of the total screen sweep for specific details ANS: TRUE

126. Which piece of test equipment will show at a glance if the circuit is working properly? ANS: a logic probe127. If an exact replacement part is not used in a repair ANS: both a and b (the same fault may continue, a new fault may be observed)

128. Incorrect removal of a component with a high lead count may ANS: damage the PC board

129. ____components have no solderable leads with which to attach them to the pc board ANS: Chip components

130. Final performance tests examine the unit for ANS: both a and b (your and the users safety, your errors)