Grob TV - Basic Television Multiple Choice
Questions and Answers
- 1.
Which of the following camera tube uses lead oxide (PbO) for the photoconductive target plate?
- A.
Vidicon
- B.
Plumbicon
- C.
Saticon
- D.
Image Orthicon
Correct Answer
B. PlumbiconExplanation
PlumbiconRate this question:
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- 2.
Camera signal output without sync is called
- A.
Black burst
- B.
Generator lock video
- C.
Composite video
- D.
Noncomposite video
Correct Answer
D. Noncomposite videoExplanation
Noncomposite video refers to a camera signal output that does not include synchronization information. This means that the video signal does not have any embedded timing signals to ensure proper synchronization with other video equipment. In contrast, composite video includes both the video signal and synchronization information, allowing for proper synchronization between different video devices. Therefore, the correct answer is noncomposite video.Rate this question:
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- 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
Correct Answer
A. Low beam currentExplanation
The correct answer is insufficient scanning width.Rate this question:
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- 4.
Which of the following camera tubes has minimum lag?
- A.
Vidicon
- B.
Plumbicon
- C.
Saticon
- D.
Iconoscope
Correct Answer
B. PlumbiconExplanation
The Plumbicon camera tube has the minimum lag compared to the other camera tubes mentioned. Lag refers to the delay between the time an image is captured by the camera and the time it is displayed. The Plumbicon tube is known for its fast response time, making it ideal for capturing fast-moving subjects without significant lag.Rate this question:
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- 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
Correct Answer
C. Yellow-greenExplanation
The yellow-green part of the visible spectrum is where the human eye is most sensitive. Therefore, camera pickup tubes would have the greatest output in this range because they are designed to mimic the sensitivity of the human eye.Rate this question:
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- 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
Correct Answer
C. A single-tube color pickupExplanation
In a black-and-white camera, only shades of gray are captured, so precise scanning size and linearity are not as important. In a plumbicon, which is a type of camera tube, linearity is important but precise scanning size is less crucial. In a single-tube color pickup, both precise scanning size and linearity are crucial because it needs to accurately capture and reproduce colors. A saticon, another type of camera tube, may not require as precise scanning size and linearity as a single-tube color pickup. Therefore, the most important factors in this case are precise scanning size and linearity, which are best met by a single-tube color pickup.Rate this question:
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- 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
Correct Answer
B. Electrical focusExplanation
The correct answer is "Electrical focus" because beam alignment magnets are used to adjust the electrical focus of the camera tube. This helps to ensure that the beam is properly focused on the target, resulting in clear and accurate imaging.Rate this question:
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- 8.
Special effects and production switching are done by the
- A.
CCU
- B.
ENG camera
- C.
SEG
- D.
Sync generator
Correct Answer
C. SEGExplanation
The correct answer is SEG. Special effects and production switching are done by the SEG, which stands for Sync generator. The sync generator is responsible for generating and synchronizing all the video signals and timing within a production, allowing for smooth transitions and effects. It ensures that all the cameras and equipment are in sync and provides the necessary signals for switching between different sources and creating special effects.Rate this question:
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- 9.
The gamma o f the picture tube is
- A.
0.4545
- B.
1.0
- C.
1.4
- D.
2.2
Correct Answer
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
Correct Answer
D. Shorter focal lengthExplanation
A shorter focal length lens allows for a wider field of view, meaning it can capture more of the scene in the frame. If the camera cannot be placed far away enough to include everything in the scene, using a shorter focal length lens would be the best solution as it allows for a wider perspective and ensures that everything in the scene can be included in the frame.Rate this question:
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- 11.
A typically value of vidicon dark current is
- A.
0.2 uA
- B.
About 200 uA
- C.
8 mA
- D.
800 mA
Correct Answer
A. 0.2 uAExplanation
The typical value of vidicon dark current is 0.2 uA. Dark current refers to the electrical current that flows through a device even when no light is present. In the case of a vidicon, which is a type of camera tube, the dark current represents the current generated by thermal energy within the tube. This value of 0.2 uA is considered typical for vidicon tubes and can be used as a reference for their performance and sensitivity.Rate this question:
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- 12.
A lens has an 8-cm focal and 4-cm diameter. Its f rating is
- A.
2
- B.
4
- C.
8
- D.
32
Correct Answer
A. 2Explanation
The f rating of a lens is determined by dividing the focal length of the lens by the diameter of the lens. In this case, the focal length is 8 cm and the diameter is 4 cm. Therefore, the f rating can be calculated as 8 cm / 4 cm = 2.Rate this question:
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- 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.
Correct Answer
B. The composite video signal includes the camera signal and sync not blankingExplanation
The composite video signal includes the camera signal and sync, but it does not include blanking. Blanking refers to the period of time during which the electron beam is turned off to prevent the scanning of the electron beam from being visible on the screen. The blanking signal is not included in the composite video signal.Rate this question:
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- 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.
Correct Answer
D. The lens inverts the optical image on the faceplates of the camera tube.Explanation
The given answer is true because the lens inverts the optical image on the faceplates of the camera tube. This is a basic principle of camera operation, where the lens focuses the light onto the faceplates of the camera tube, and due to the nature of optics, the image is inverted. This inverted image is then processed and transmitted to the display device.Rate this question:
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- 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
Correct Answer
A. Target plateExplanation
The target plate is responsible for producing the signal variations for G4 of the vidicon.Rate this question:
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- 16.
What is the gamma required for the camera tube?
- A.
2.2
- B.
0.4545
- C.
4.545
- D.
0.22
Correct Answer
B. 0.4545Explanation
The gamma required for the camera tube is 0.4545. Gamma is a measure of the relationship between the input voltage and the resulting brightness or intensity of the image. A gamma of 0.4545 suggests that the camera tube requires a non-linear response to accurately capture and reproduce images. This non-linear response helps to ensure that the resulting image appears more natural and visually pleasing to the human eye.Rate this question:
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- 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
Correct Answer
A. ColorExplanation
Color is more important for gamma correction for the camera tube because gamma correction is a technique used to adjust the brightness and contrast of an image. Since color information plays a crucial role in determining the overall appearance and quality of an image, it is essential to accurately correct the gamma values for each color channel. Monochrome images, on the other hand, do not have color information, so gamma correction for monochrome images is not as critical as it is for color images. Therefore, color is the more important factor in gamma correction for the camera tube.Rate this question:
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- 18.
In gamma correction the is stretched by the picture tube.
- A.
Black
- B.
Gray
- C.
White
- D.
Red
Correct Answer
C. WhiteExplanation
In gamma correction, the brightness or intensity of the image is adjusted to match the characteristics of the display device, such as a picture tube. This adjustment is done by stretching the gamma curve, which determines how the input signal is translated into brightness levels on the screen. The correct answer, white, suggests that when gamma correction is applied, the brightest parts of the image are stretched to appear even brighter on the picture tube.Rate this question:
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- 19.
To how many lax units is the illuminator of 3 fs, approximately equal?
- A.
650
- B.
225
- C.
65
- D.
30
Correct Answer
D. 30Explanation
The illuminator of 3 fs is approximately equal to 30 lax units.Rate this question:
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- 20.
What is the diagonal screen size for the 19CP4 picture tube?
- A.
12 in.
- B.
16 in.
- C.
19 in.
- D.
24 in.
Correct Answer
C. 19 in.Explanation
The correct answer is 19 in. The diagonal screen size refers to the measurement from one corner of the screen to the opposite corner. In this case, the 19CP4 picture tube has a diagonal screen size of 19 inches.Rate this question:
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- 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
Correct Answer
B. 90ºExplanation
A maximum deflection angle of 45 degrees on either side of the center corresponds to a total deflection angle of 90 degrees.Rate this question:
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- 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
Correct Answer
C. 6.3 VExplanation
The usual heater voltage for a picture tube is 6.3 V. This voltage is commonly used to provide the necessary heat for the filament inside the picture tube, which in turn emits electrons to create the images on the screen.Rate this question:
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- 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
Correct Answer
B. 30 kVExplanation
The typical anode voltage for a 25-inch color picture tube is 30 kV. This high voltage is necessary to accelerate the electrons towards the screen of the picture tube, allowing for the creation of a bright and clear image. Lower voltages such as 10 kV or 1 kV would not provide enough acceleration for the electrons, resulting in a dim or distorted image. Similarly, 30 V is too low to produce a visible image on the screen. Therefore, 30 kV is the correct answer.Rate this question:
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- 24.
Typically, the anode capacitance for a 25-in tube is
- A.
2
- B.
20
- C.
205
- D.
2000
Correct Answer
D. 2000Explanation
The anode capacitance for a 25-inch tube is typically 2000.Rate this question:
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- 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
Correct Answer
C. Instant-on operationExplanation
Instant-on operation refers to the ability of a device, in this case, a TV set, to turn on and start functioning immediately without any delay. In this scenario, when the TV set is turned on, it quickly receives full power, causing the heater to heat up and the picture to appear almost instantly. This indicates that the TV has an instant-on operation feature, allowing it to start functioning without any noticeable delay.Rate this question:
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- 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
Correct Answer
C. P4 and P22Explanation
The phosphor numbers for monochrome and color picture tubes are P4 and P22, respectively.Rate this question:
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- 27.
What is the color of P1 screen phosphor?
- A.
Red
- B.
Blue
- C.
White
- D.
Green
Correct Answer
D. GreenExplanation
The color of the P1 screen phosphor is green.Rate this question:
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- 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
Correct Answer
B. Control grid G1Explanation
The control grid G1 is the most negative (or least positive) electrode in the electron gun. This means that it has a lower potential compared to the other electrodes mentioned (cathode, screen grid, and focus grid). The control grid G1 is responsible for controlling the flow of electrons in the electron gun, and its negative potential helps in regulating the movement and intensity of the electron beam.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Dec 19, 2010Quiz Created by
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