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

View Answer

Answer: Enable (EN)

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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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Misconvergence

35 The abbreviation TW is for pincushion correction.

A Vertical

B Horizontal

C Diagonal

D Either Way

View Answer

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

View Answer

Answer: Visual Cutoff

37 Electro-optical effect is produced in ___________

A LCD

B OLED

C LED

D OFC

View Answer

Answer: LCD

38 The first LCDs became commercially available in ___________

A 1960s

B 1970s

C 1950s

D None

View Answer

Answer: 1960s

39 LCDs operate from a voltage ranges from ___________

A 10 to 15V

B 10V

C 3 to 15V

D 5V

View Answer

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

View Answer

Answer: 2.2 V

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