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Free download in PDF LED and LCD TV Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Which of the following displays has slowest switching speed?
[A]
LCD
[B]
Fluorescent
[C]
LEDs
[D]
Nixie tubes
(22)
Which control line/s act/s as an initiator by apprising LCD about the inception of data transmission by the microcontroller?
[A]
Read/Write (RW)
[B]
Register Select (RS)
[C]
Enable (EN)
[D]
All of the above
(23)
When can a LCD display the text form of data ?
[A]
only when RS line is high
[B]
only when RW line is low
[C]
only when RS line is low
[D]
only when RW line is high
Answer: only when RS line is high
(24)
Camera signal output without sync is called
[A]
Noncomposite Video
[B]
Composite Video
[C]
Black burst
[D]
Generator Lock Video
Answer: Noncomposite Video
(25)
Precise scanning size and linearity are most important in
[A]
A Single-Tube Color Pickup
[B]
A Saticon
[C]
A Black-And-White Camera
[D]
A Plumbicon
Answer: A Single-Tube Color Pickup
(26)
If the camera cannot be placed far away enough to include everything in the scene, change the lens to one with a
[A]
shorter focal length
[B]
higher f rating
[C]
lower f rating
[D]
longer focal length
Answer: shorter focal length
(27)
Which of the following is FALSE?
[A]
The composite video signal includes the camera signal and sync not blanking
[B]
The standard composite video from a camera is 1V p-p with negative sync
[C]
The lens inverts the optical image on the faceplate of the camera tube
[D]
The plumbicon uses a lead oxide layer for the target plate
Answer: The composite video signal includes the camera signal and sync not blanking
(28)
Which of the following is TRUE?
[A]
the lens inverts the optical image on the faceplates of the camera tube
[B]
The plumbicon camera tube uses a silicon target plate
[C]
The diameter of the vidicon image plate is about 5 in. (127 mm)
[D]
The composite video signal includes the camera signal and sync but not blanking
Answer: the lens inverts the optical image on the faceplates of the camera tube
(29)
Which of the following produces the signal variations for G4 of the vidicon.
[A]
Beam control
[B]
Wire mesh
[C]
Muzzle
[D]
Target plate
(30)
When the TV set was turned on, full power was applied to the heater and the picture appeared within a fraction of a second.
[A]
Instant-on operation
[B]
Screen persistence
[C]
Implosion
[D]
Ultor
Answer: Instant-on operation
31
Which is the most position element in the electron gun?
[A]
Ultor or anode
[B]
Cathode
[C]
Anode
[D]
Ultor
32
The coils above and below the electron beam of the picture tube are for .
[A]
H scanning
[B]
V scanning
[C]
Either V or H scanning
[D]
None of these
33
When the receiver is first turned on, what current does the ADG circuit have?
[A]
Low
[B]
High
[C]
Both high and low
[D]
Neither high nor Low
34
What does the color fringing on the edge of the picture shows?
[A]
Misconvergence
[B]
Red cloud
[C]
Insufficient signal drive
[D]
Turned off guns
35
The abbreviation TW is for pincushion correction.
[A]
Vertical
[B]
Horizontal
[C]
Diagonal
[D]
Either Way
36
The R, G, and B screen grid adjustments are set for in the picture.
[A]
White Highlights
[B]
Brightness Control
[C]
Visual Cutoff
[D]
Gray-Scale Tracking
37
Electro-optical effect is produced in ___________
[A]
LCD
[B]
OLED
[C]
LED
[D]
OFC
38
The first LCDs became commercially available in ___________
[A]
1960s
[B]
1970s
[C]
1950s
[D]
None
39
LCDs operate from a voltage ranges from ___________
[A]
10 to 15V
[B]
10V
[C]
3 to 15V
[D]
5V
40
For the operation of FET with TTL logic, the threshold voltage of FET shall be
[A]
2.2 V
[B]
4 V
[C]
-12 V
[D]
-4 V
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