MCQs in Basic Television – Grob TV – Part I

(Last Updated On: December 8, 2017)

MCQs in Basic Television - Grob TV - Part I

This is the Multiples Choice Questions Part 1 of the Series in Basic Television – Grob TV as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

The Series

Following is the list of multiple choice questions in this brand new series:

Basic Television – GROB TV MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 152                   Answer key: PART III

Start Practice Exam Test Questions Part I of the Series

Choose the letter of the best answer in each questions.

1. Which of the following camera tube uses lead oxide (PbO) for the photoconductive target plate?

  • A. Vidicon
  • B. Plumicon
  • C. Saticon
  • D. Image Orthicon

2. Camera signal output without sync is called

  • A. Black burst
  • B. generator lock video
  • C. composite video
  • D. noncomposite video

3. A low-contrast picture in which white seems flat and lacking in detail suggest

  • A. low beam current
  • B. high gain in the amplifier
  • C. excessive gamma
  • D. insufficient scanning width

4. Which of the following camera tubes has minimum lag?

  • A. Vidicon
  • B. Plumbicon
  • C. Saticon
  • D. Iconoscope

5. The part of the visible spectrum where camera pickup tubes have the greatest output is

  • A. red
  • B. blue
  • C. yellow-green
  • D. infrared

6. Precise scanning size and linearity are most important in

  • A. a black-and-white camera
  • B. a plumbicon
  • C. a single-tube color pickup
  • D. a saticon

7. Beam alignment magnets for the camera tube are adjusted while rocking which control?

  • A. Optical focus
  • B. Electrical focus
  • C. Beam current
  • D. Shading

8. Special effects and production switching are done by the

  • A. CCU
  • B. ENG camera
  • C. SEG
  • D. Sync generator

9. The gamma of the picture tube is

  • A. 0.4545
  • B. 1.0
  • C. 1.4
  • D. 2.2

10. If the camera cannot be placed far away enough to include everything in the scene, change the lens to one with a

  • A. lower f rating
  • B. higher f rating
  • C. longer focal length
  • D. shorter focal length

11. A typically value of vidicon dark current is

  • A. 0.2 uA
  • B. about 200 uA
  • C. 8 mA
  • D. 800 mA

12. A lens has an 8-cm focal and 4-cm diameter. Its f rating is

  • A. 2
  • B. 4
  • C. 8
  • D. 32

13. Which of the following is FALSE?

  • A. The lens inverts the optical image on the faceplate of the camera tube.
  • B. The composite video signal includes the camera signal and sync not blanking
  • C. The standard composite video from a camera is 1V p-p with negative sync.
  • D. The plumbicon uses a lead oxide layer for the target plate.

14. Which of the following is TRUE?

  • A. The diameter of the vidicon image plate is about 5 in. (127 mm)
  • B. The plumbicon camera tube uses a silicon target plate.
  • C. The composite video signal includes the camera signal and sync but not blanking.
  • D. the lens inverts the optical image on the faceplates of the camera tube.

15. Which of the following produces the signal variations for G4 of the vidicon.

  • A. Target plate
  • B. Wire mesh
  • C. Muzzle
  • D. Beam control

16. What is the gamma required for the camera tube?

A. 2.2

B. 0.4545

C. 4.545

D. 0.22

17. is more important for the gamma correction for the camera tube.

  • A. Color
  • B. Monochrome
  • C. Both Color and monochrome
  • D. Either of Color or monochrome

18. In gamma correction the is stretched by the picture tube.

  • A. Black
  • B. gray
  • C. white
  • D. red

19. To how many lax units is the illuminator of 3 fs, approximately equal?

  • A. 650
  • B. 225
  • C. 65
  • D. 30

20. What is the diagonal screen size for the 19CP4 picture tube?

  • A. 12 in.
  • B. 16 in.
  • C. 19 in.
  • D. 24 in.

21. To what deflection angle does a maximum deflection angle of 45 deg either side center correspond?

  • A. 30º
  • B. 90º
  • C. 120º
  • D. 360º

22. What is the usual heater voltage for picture tube?

  • A. 1.6 v
  • B. 5.6 V
  • C. 6.3 V
  • D. 9.3V

23. What is the typical anode voltage for a 25-in color picture tube?

A. 10 kV

B. 30 kV

C. 1 kV

D. 30 V

24. Typically, the anode capacitance for a 25-in tube is pT.

  • A. 2
  • B. 20
  • C. 205
  • D. 2000

25. 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. Ultor
  • B. Implosion
  • C. Instant-on operation
  • D. Screen persistence

26. What are the phosphor numbers, respectively, for monochrome and color picture tubes?

  • A. P1 and P4
  • B. P1 and P22
  • C. P4 and P22
  • D. P4 and P1

27. What is the color of P1 screen phosphor?

  • A. Red
  • B. Blue
  • C. White
  • D. Green

28. Which of the following is the most negative (or least positive) electrode is the electron gun?

  • A. Cathode
  • B. Control grid G1
  • C. Screen grid
  • D. Focus grid

29. Which is the most position element in the electron gun?

  • A. Ultor
  • B. Anode
  • C. Cathode
  • D. Ultor or anode

30. Most of the electrons in the beam flow out of which terminal?

  • A. Ultor
  • B. Anode
  • C. Cathode
  • D. Ultor or anode

31. The crossover point for focusing is formed by the electron lens.

  • A. first
  • B. second
  • C. Cathode
  • D. fourth

32. In which method in a G3 voltage of 200 V. used for?

  • A. low-voltage focus
  • B. high-voltage focus
  • C. either low or high voltage focus
  • D. none of these

33. Small magnets embedded in the yoke housing is correct for _________.

A. yoke position

B. magnetic deflection

C. pinoushion distortion

D. centering adjustments

34. The coils above and below the electron beam of the picture tube are for .

  • A. V scanning
  • B. H scanning
  • C. Either V or H scanning
  • D. None of these

35. Neck shadow result when the deflection yoke is .

  • A. too near back
  • B. too near forward
  • C. too far back
  • D. too far forward

36. In color picture tube, degaussing should be done the color purity adjustments.

  • A. after
  • B. before
  • C. either way
  • D. none at all

37. In color picture tube, degaussing is done with .

  • A. direct current
  • B. alternating current
  • C. 60 Hz alternating current
  • D. 90 Hz alternating current

38. When the receiver is first turned on, what current does the ADG circuit have?

  • A. High
  • B. Low
  • C. Both high and low
  • D. Neither high nor Low

39. In color picture tube, what does a solid red raster checked for?

  • A. good color purity
  • B. Convergence
  • C. Degaussing
  • D. Resetting the yoke

40. Where do the small, white dots in the picture used for?

  • A. good color purity
  • B. convergence
  • C. Degaussing
  • D. Resetting the yoke

41. What does the color fringing on the edge of the picture shows?

  • A. Misconvergence
  • B. Insufficient signal drive
  • C. Turned off guns
  • D. Red cloud

42. Static convergence is done for the of the screen.

  • A. center
  • B. edges
  • C. left
  • D. right

43. Where the permanent magnets used?

  • A. static convergence
  • B. dynamic convergence
  • C. automatic degaussing
  • D. resetting the yoke

44. In picture, the basic waveform for dynamic convergence is the ________.

  • A. parabola
  • B. half a sine wave
  • C. full sine wave
  • D. parabola or half of sine wave

45. Pincushion magnets are used for picture tubes.

  • A. monochrome
  • B. color
  • C. both color and monochrome
  • D. either color or monochrome

46. The abbreviation TW is for pincushion correction.

  • A. diagonal
  • C. horizontal
  • B. vertical
  • D. either way

47. The typical dc grid bias for a 19-in, picture tube.

  • A. -4 V
  • B. –40V
  • C. -6 V
  • D. -60 V

48. Typical ac signal drive for a 19-in, picture tube.

  • A. 8 Vp-p
  • B. 40 Vp-p
  • C. 120 Vp-p
  • D. 140 Vp-p

49. For the picture tube, the brightness control varies the bias signal drive.

  • A. dc
  • B. ac
  • C. either ac or dc
  • D. both ac and dc

50. The R, G, and B screen grid adjustments are set for in the picture.

  • A. visual cutoff
  • B. white highlights
  • C. brightness control
  • D. gray-scale tracking

SEE ALSO: Complete List of Basic Television – Grob TV Chapter Exercises

Complete List of MCQs in Electronics Engineering per topic

MCQs in Basic Television – Grob TV – Part I
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