Which of the following statement(s) is/are correct ?
All of the above
A cathode-ray tube (CRT) display works by firing a focused electron beam at a phosphor-coated screen; the statements describe three of its parts and properties.
Persistence: after the electron beam leaves a spot, the phosphor keeps emitting light for a while (phosphorescence) and then fades. Persistence is defined as the duration of this phosphorescence, commonly measured as the time for the emitted light to decay to one-tenth of its original intensity. The first statement is true.
Control electrode (control grid): a voltage on this electrode regulates the number of electrons passing through it, controlling the beam's intensity; a sufficiently negative voltage stops the beam altogether, so it is used to turn the electron beam on and off. The second statement is true.
Electron gun: the heated cathode emits electrons, which the accelerating anode and focusing system shape into a narrow beam aimed at the phosphor-coated face of the CRT. The third statement is true.
Since each of the three individual statements is true, choosing any one of them alone would leave out the other two correct statements.
All of the above option is correct.
Similar Questions
Match the following :
List – I List – II a. Tablet, Joystick i. Continuous devices b. Light Pen, Touch Screen ii. Direct devices c. Locator, Keyboard iii. Logical devices d. Data Globe, Sonic Pen iv. 3D interaction devices Codes :
a b c d
Which of the following is/are the components of a CRT ?
(a) Electron Gun
(b) Control Electrode
(c) Focusing Electrode
(d) Phosphor Coated Screen
Codes :
Which of the following is/are the principal components of a memory-tube display ?
(a) Flooding gun (b) Collector
(c) Phosphorus grains (d) Ground
Codes :
Match the following :
List - I List - II (a) Flood Gun (i) An electron gun designed to flood the entire screen with electrons. (b) Collector (ii) Partly energised by flooding gun, stores the charge generated by the writing gun. (c) Ground (iii) Used to discharge the collector. (d) Phosphorus grains (iv) Used in memory - tube display and similar to those used in standard CRT. (e) Writing Gun System (v) Used in memory - tube display and basically the same as the electron gun used in a conventional CRT. Codes :
Beam-penetration and shadow-mask are the two basic techniques for producing color displays with a CRT. Which of the following is not true ?
I. The beam-penetration is used with random scan monitors.
II. Shadow-mask is used in raster-scan systems.
III. Beam-penetration method is better than shadow-mask method.
IV. Shadow-mask method is better than beam-penetration method.
Match List I with List II
List I List II A. 2-D Array Input I. Liquid Crystal display B. Transmissive device II. Flat-bed scanner C. Binary image III. Camera D. 1-D array input IV. Ink jet printer Choose the correct answer from the options given below:
The light given off by the phosphor during exposure to the electron beam is known as
Match the following :
a. Glass i. Contains liquid crystal and serves as a bonding surface for a conductive coating. b. Conductive coating ii. Acts as a conductor so that a voltage can be applied across the liquid crystal. c. Liquid crystal iii. A substance which will polarize light when a voltage is applied to it. d. Polarized film iv. A transparent sheet that polarizes light. Codes :
Important Questions from Graphics Systems
- Which of the following are applicable to programming graphics (pre-design phase) during design development process?
(a) Graphic worksheets
(b) Analysis cards
(c) Variety of matrics
(d) Bubble diagram
Choose the correct option : The duration of phosphorescence exhibited by a phosphor is known as ______.
A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately:
Match the following :
List – I List – II a. Tablet, Joystick i. Continuous devices b. Light Pen, Touch Screen ii. Direct devices c. Locator, Keyboard iii. Logical devices d. Data Globe, Sonic Pen iv. 3D interaction devices Codes :
a b c d
Which component of CRT regulate the intensity of electron beam?
