6. Television had its beginnings with:
a. development in the 1930's and broadcasting beginning in the 1940's.
b. development in the 1920's and broadcasting beginning in the 1950's.
c. development in the 1920's and broadcasting beginning in the 1940's.
d. development in the 1930's and broadcasting beginning in the 1950's.
Answer: c
7. The device that feeds both visual and aural TV transmitter signals to the antenna while not allowing either to be fed back into the other transmitter is called:
a. a synchronizer.
b. a vidicon.
c. a diplexer.
d. an image orthicon.
Answer: c
8. The most widely used TV camera imaging device today is:
a. the CCD.
b. the vidicon.
c. the diplexer.
d. the iconoscope.
Answer: a
9. The aspect ratio for NTSC broadcast television is:
a. a 4:3 ratio.
b. a 7:9 ratio c. a 6:9 ration d. all of the above.
Answer: a
10. For U.S. NTSC TV broadcasts, the total number of visible scanning lines is set at:
a. 525 lines.
b. 339 lines.
c. 485 lines.
d. 40 lines.
Answer: c
11. The field frequency for U.S. NTSC television broadcasts is:
a. 30 fields per second.
b. 40 fields per second.
c. 60 fields per second.
d. 100 fields per second.
Answer: c
TEST ITEM FILE – Chapter 17
12. The horizontal oscillator frequency for U.S. NTSC television broadcasts is set at approximately:
a. 3.58 MHz.
b. 30 Hz.
c. 60 Hz.
d. 15.75 kHz.
Answer: d
13. The color burst frequency for U.S. NTSC television broadcasts is approximately:
a. 3.58 MHz.
b. 30 Hz.
c. 60 Hz.
d. 15.75 kHz.
Answer: a
14. The type of synchronizing pulse that has a 10 microsecond pulse width with an eight cycle sinewave burst at 3.58 MHz on its "back porch" is called:
a. the color synchronizing pulse.
b. the horizontal retrace pulse.
c. the vertical retrace pulse.
d. the equalizing pulse.
Answer: b
15. Vertical resolution for U.S. NTSC television is approximately:
a. 428 horizontal lines.
b. 428 vertical lines.
c. 339 horizontal lines.
d. 339 vertical lines.
Answer: c
16. Horizontal resolution for U.S. television is approximately:
a. 428 horizontal lines.
b. 428 vertical lines.
c. 339 horizontal lines.
d. 339 vertical lines.
Answer: b
17. Channel 9 on U.S. television extends from 186 to 192 MHz. The channel 9 sound carrier is approximately:
TEST ITEM FILE – Chapter 17
18. The high voltage output is derived from the low voltage power supply using:
a. the low voltage power supply transformer.
b. the yoke coil.
c. the flyback transformer.
d. the vertical oscillator.
Answer: c
19. Most television IF amplifiers are stagger tuned in order to:
a. get a very narrow bandwidth with high Q.
b. get a wide enough bandwidth for the TV channel but still have steep roll-offs at the passband edges.
c. receive both VHF and UHF TV channels.
d. receive both high-band and low-band VHF TV channels.
Answer: b
20. To obtain the steep attenuation curve for the sound carrier portion of the IF signal passed by the TV receiver IF amplifiers, what is used?
a. SAW filters b. ceramic filters c. mechanical filter d. wave traps
Answer: d
21. In a television receiver, in order to produce sufficient contrast in the display of the picture tube, the video amplifier stages must have a minimum frequency response of:
a. 15.75 kHz.
b. 4 MHz.
c. 6 MHz.
d. 45 MHz.
Answer: b
22. By generating the color information at exactly the right color subcarrier frequency
(approximately 3.58 MHz) it is possible to produce color frequency components sandwiched in between the frequency components of the black and white video signal. This technique is known as:
a. interlaced scanning.
b. interleaving.
c. convergence.
d. shadow masking.
Answer: b
TEST ITEM FILE – Chapter 17
23. Which is not a color of a beam on a color picture tube?
a. yellow
b. blue
c. green
d. red
Answer: a
24. Which of the following is not an improvement made in television since 1980?
a. an increase in the number of UHF TV channels b. Zenith/dbx enhanced audio
c. separate audio program (SAP) d. high definition TV enhanced video Answer: a
25. A faulty TV receiver having symptoms of no picture, no sound, and no raster must have a problem in the:
a. horizontal or vertical oscillator or high voltage power supply.
b. main power supply.
c. video amplifiers following the sound takeoff.
d. RF, IF, or video amps prior to sound takeoff.
Answer: b
26. A faulty TV receiver having symptoms of normal sound but no raster must have a problem in the:
a. horizontal or vertical oscillator or high voltage power supply.
b. main power supply.
c. video amplifiers following the sound take-off.
d. RF, IF, or video amplifiers prior to sound take-off.
Answer: a
27. A faulty TV receiver having symptoms of normal raster, but distorted sound and picture must have a problem in the:
a. horizontal or vertical oscillator or high voltage power supply.
b. main power supply.
c. video amplifiers following the sound take-off.
d. RF, IF, or video amplifiers prior to sound take-off.
Answer: d
TEST ITEM FILE – Chapter 17
28. The DTV standard based on the recommendations of the ATSC provides for the transmission of television programs in the:
a. HDTV screen format 16 × 9 b. SDTV screen format c. Multiple SDTV programs d. All of the above
Answer: d
29. The video compression technique selected for DTV transmission is:
a. JPEG b. MPEG2 c. GIF d. BMP Answer: b
30. The digital audio compression technique specified for digital television is:
a. AC-3 b. MPEG2 c. NTSC d. 8VSB Answer: a
31. The RF modulation technique for ATSC DTV transmission is:
a. 8QAM b. 8VSB c. 8QPSK d. 8FSK Answer: b
32. The commercial name for the AC-3 audio standard is:
a. 5.1 channel input b. 4:4:2
c. ATSC
d. none of the above Answer: a
33. The ATSC pilot carrier provides:
a. stereo indicator
b. second channel programming c. frame sync
d. a clock reference Answer: d
34. The 8VSB exciter inserts what to aid the 8VSB receiver in accurately recovering the transmitted data?
a. pilot carrier b. frame sync c. segment sync
TEST ITEM FILE – Chapter 17
35. The term for when a digital picture freezes even when there is motion is:
a. freeze frame b. pixelate c. stop motion d. 8VSB Answer: b
36. The ATSC Data Transport rate is which of the following?
a. 19.39kbps b. it is used for closed captioning
c. it is used to identify NTSC feeds d. it is used to identify the channel Answer: d
38. This is used by the digital receiver to lock onto the digital data stream so the multiplexed data can be recovered.
a. the DTV pilot signal b. the GPS data stream c. the SONET data stream d. none of the above
Answer: a
39. The point where there is a lot of multiple echo and you have reached the threshold of visibility in a DTV signal is called
a. cliff effect
b. the receiver limit function c. the receiver gain function d. figure of merit
Answer: a
40. What three things make up the ATSC transport stream?
a. Video data stream (MPE62 encoding) b. The 3.579545 MHz color subcarrier c. Audio data stream (AC-3 encoding) d. PSIP, program, Information, control, ect
Answer: a,c,d