LED and LCD TV Quiz | LED and LCD TV Objective Type Questions and Answers

Questions
21 Which of the following displays has slowest switching speed?
A LCD
B Fluorescent
C LEDs
D Nixie tubes

Answer: LCD
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

Answer: Enable (EN)
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

Answer: 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

Answer: Ultor or anode
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

Answer: H scanning
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

Answer: High
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

Answer: Misconvergence
35 The abbreviation TW is for pincushion correction.
A Vertical
B Horizontal
C Diagonal
D Either Way

Answer: Vertical
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

Answer: Visual Cutoff
37 Electro-optical effect is produced in ___________
A LCD
B OLED
C LED
D OFC

Answer: LCD
38 The first LCDs became commercially available in ___________
A 1960s
B 1970s
C 1950s
D None

Answer: 1960s
39 LCDs operate from a voltage ranges from ___________
A 10 to 15V
B 10V
C 3 to 15V
D 5V

Answer: 3 to 15V
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

Answer: 2.2 V
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