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Republic of the Philippines
SOUTHERN LUZON STATE UNIVERSITY
Alabat Campus
Alabat, Quezon
Midterm Examination
ELX 05 Advance Audio/Video Player Service
Name: _____________________________________
Course: ___________________
Score: _____________
Date: ______________
Test I Multiple Choice
Direction: Choose the letter of the correct answer from the given options for each number.
Shade the circle corresponding to the letter of your answer before each number. Any
undecided answers are not counted. (2 pts. each)
A B C D
Example. How many subsystem the television have?
a. 8
b. 9
c. 10
d. 11
1. Most of the lower voltage used in the TV may be delivered, form what kind
of deflection circuit?
a. Horizontal
b. Vertical
c. Demodulator
d. Synchronization
2. From the AC line they provide B+, which of the four did not provide B+?
a. Rectifier Cap.
b. Filter Cap.
c. Horizontal Trans.
d. Regulator
3. These circuit provide the waveform needed to sweep the electron beam in
the CRT across and back.
a. Horizontal Deflection
b. Vertical Deflection
c. Horizontal Sync Pulse
d. Vertical Sync Pulse
4. It locks the vertical deflection to the video signal.
a. Horizontal Deflection
b. Vertical Deflection
c. Horizontal Sync Pulse
d. Vertical Sync Pulse
5. It locks the horizontal deflection to the video signal.
a. Horizontal Deflection
b. Vertical Deflection
c. Horizontal Sync Pulse
d. Vertical Sync Pulse
6. These circuit provide the waveform needed to sweep the electron beam in
the CRT from top to bottom.
a. Horizontal Deflection
b. Vertical Deflection
c. Horizontal Sync Pulse
d. Vertical Sync Pulse
7. A modern color CRT requires how many voltages for a crisp bright picture?
a. 30 volts
b. 300 volts
c. 30,000 volts
d. 3,000 volts
8. Nearly every TV on the planet derives the HV from the horizontal deflection
using a special transformer called?
a. Low output transformer
b. High output transformer
c. Chopper transformer
d. Multiple output transformer
9. It is usually shielded metal box positioned on the bottom right separate
from the main circuit board.
a. AGC
b. Tuner
c. video demodulator
d. Audio demodulator
10. The following are being input by antenna or cable signal and output are
baseband video and audio signal EXCEPT for one.
a. Tuner
b. AGC
c. IF
d. RF
11. The input of this is the baseband video signal.
a. Chroma demodulator
b. Video demodulator
c. Audio demodulator
d. Audio/Video demodulator
12. These are almost always located on a little circuit board plugged directly
onto the neck of the CRT.
a. Audio Driver
b. Audio demodulator
c. Video Driver
d. Video demodulator
13. The output of chroma demodulators are the following EXCEPT for one.
a. Green
b. Red
c. Blue
d. Yellow
14. Input is baseband video. Output are horizontal and vertical sync pulses to
control the deflection circuit.
a. Sync separation
b. Sync separator
c. Sync demodulator
d. Audio / video sync
15. The line level audio is amplified to drive a set of speaker.
a. Audio amplifier/output
b. Audio amplifier/input
c. Video amplifier/output
d. Audio amplifier/input
16. The system control uses _______________ - a fixed program
microcontroller to perform all user interfaces and control functions from the
front panel and remote control.
a. Microcontroller
b. CPU
c. Memory
d. None of these
17. TV’s and computer or video monitors are among the more dangerous of
consumer electronic equipment when it comes to _____________.
a. Repair
b. Servicing
c. Maintenance
d. all of these
18. Major parts of nearly all modern TV’s and other computer monitors are
directly connected to the _______________ .
a. AC line
b. DC line
c. none of these
d. both a and b
19. It’s generates most of the other voltages used in the unit and provides an
isolation barrier so that the signal circuits are not line connected and safer.
a. Fuse
b. Filter Cap.
c. Demodulator
d. Flyback
20. How many times that the CRT is higher than the line input?
a. 400
b. 300
c. 200
d. 100
21. What is used to protect you, your test equipment, and the TV from
serious damage?
a. Line filter
b. Filter Cap.
c. Bridge rectifier
d. Regulator
22. Which of these are used to protect you from potential electrical shock
hazards as well as the equipment from accidental damage?
a. Guidelines
b. Safety
c. Safety guidelines
d. Rules
23. In discharging filter capacitor of 200 volts, it is recommended to used,
how many Ohm of resistor will you use?
a. 20K to 100K
b. 100 to 500 ohm
c. 500 to 20K
d. 1 to 100 ohm
24. What appliances uses chassis as ground return for the high voltage?
a. Television
b. Video Recorder
c. Monitor
d. Microwave Oven
25. What wattage of resistor is appropriate in discharging large filter
capacitor?
a. 1/4 W
b. 1/2 W
c. 1 W
d. 2 W
26. What kind of transformer will be used if there is any chance of contacting
line connected circuits
a. Isolation transformer
b. Non-isolation transformer
c. Neither the two
d. both a and b
27. Always wear ___________ when working around the backside of a CRT.
a. Mouth piece
b. Ear Plug
c. Eye Glasses
d. None of these
28. The multimeter is used for different ways EXCEPT for one.
a. testing
b. repairing
c. monitoring
d. checking
29. Don’t start with electronics equipment start with some ____________.
a. Analytical thinking
b. Logical thinking
c. Either a and b
d. None of these
30. It is used for adjustment to prevent the presence of metal from altering
the electrical properties of the circuit.
a. Straight blade screw driver
b. Philips screw driver
c. Non-metallic tip Screwdriver
d. Socket driver
31. The radiation of light from the screen of a TV picture tube as it is excited
is known as _______________.
a. Fluorescence
b. Phosphorescence
c. Radiance
d. Luminescence
32. The ____________ blanks out retrace for each H line by making video
signal go to the black blanking level @ 15 750 Hz.
a. Horizontal Sync Pulse
b. Vertical Sync Pulse
c. Horizontal Blanking Pulse
d. Vertical Blanking Pulse
33.
Luminance or brightness
_______________.
a. Multiplexing
c. Contrast
without
color
is
considered
as
b. Hue
d. Monochrome
34. Brightness variations of the picture information are in which signal.
a. I
b. Y
c. Q
d. R-Y
35. The intensity of color is called ______________.
a. Brightness
b. Tint
c. Contrast
d. Saturation
36. The process of combining two signals on one carrier is called
_____________.
a. Multiplexing
b. Modulation
c. Heterodyning
d. Colorplexing
37. The complementary color for red is _____________ in color Television.
a. Green
b. Magenta
c. Cyan
d. Yellow
38. The complementary color for blue is _____________ in color Television.
a. Green
b. Magenta
c. Cyan
d. Yellow
39. The complementary color for green is _____________ in color Television.
a. Red
b. Magenta
c. Cyan
d. Yellow
40. The carrier that modulates another carrier wave of higher frequency is
known as _____________.
a. Burst
b. Subcarrier
c. Synchronous Carrier
d. IF Signal
41. It includes the camera signal with the picture information, sync pulses and
blanking pulses.
a. Composite Video Signal
b. RF Transmission Signal
c. Deflection Signal
d. Retrace Signal
42. The _____________ times the scanning for each H Line @ 15750 Hz.
a. Horizontal Sync Pulse
b. Vertical Sync Pulse
c. Horizontal Blanking Pulse
d. Vertical Blanking Pulse
43. The ________ blanks out the scanning during vertical retrace @ 60 Hz.
a. Horizontal Sync Pulse
b. Vertical Sync Pulse
c. Horizontal Blanking Pulse
d. Vertical Blanking Pulse
44. What is the result of Low B+ in TV receiver?
a. Insufficient Brightness
b. Raster too narrow insufficient width
c. Only one-bright line
d. Raster to small
45. What will happen if the vertical deflection is weak?
a. Insufficient Brightness b. Raster too narrow insufficient width
c. Only one-bright line
d. Raster to small
46. What is the melting point of 95/5 soldering lead or solder?
a. 460 degree F (230 °C)
c. 434 degree F (224 °C)
b. 418 degree F (214 °C)
d. 374 degree F (190 °C)
47. What is the melting point of 40/60 soldering lead or solder?
a. 460 degree F (230 °C)
c. 434 degree F (224 °C)
b. 418 degree F (214 °C)
d. 374 degree F (190 °C)
48. AGC stands for
a. Automatic Gain Controller
c. Automatic Gain Control
b. Automatic Gains Controller
d. Automatic Gains Control
49. VITS stands for
a. Vertical Interval Test Signal
c. Vertical Internet Test Signal
b. Vertical Interest Test Signal
d. Vertical Internal Test Signal
50. If the TV receiver has the trouble indicator of “no brightness, sound
normal” the following are the checks to make except for one.
a. High voltage circuit and fuse
b. ion trap magnet
c. weak vertical output
d. kinescope voltage