Match the following : Codes :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.
a-i, b-ii, c-iii, d-iv
A liquid crystal display is built as a sandwich of layers. Each component in the left column has one role in that sandwich (Schaum's outline on computer graphics describes them in these words).
a. Glass: the glass plates enclose the liquid crystal and serve as a bonding surface for the conductive coating, so a matches i.
b. Conductive coating: a transparent conductive layer on the glass acts as a conductor so that a voltage can be applied across the liquid crystal, so b matches ii.
c. Liquid crystal: the liquid-crystal material is the substance that polarizes (rotates the polarization of) light when a voltage is applied to it, so c matches iii.
d. Polarized film: the outer polarizer is a transparent sheet that polarizes light, so d matches iv.
Codes that send the liquid crystal to ii or the conductive coating to iii swap the conducting layer with the light-modulating layer; codes that send glass to iv or the polarized film to i or iii confuse the polarizer with the glass plates or the crystal.
a-i, b-ii, c-iii, d-iv option is correct.
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
Which of the following statement(s) is/are correct ?
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?