Page 44 - DCAP504_Computer Graphics

Unit 3: Overview of Graphics I/O Devices

(c) The keyboard is an example of Locator Function device.
(d) Interlacing of the scan lines allows us to see the entire screen displayed in one-half the time it
would have taken to sweep across all the lines at once from top to bottom.

(e) In a raster scan display system, 1 to 24 or more bits represent each pixel depending on the
quality of the display system and certain attributes of the pixel.
(f) The valuator function selects objects within the displayed picture.
2. Fill in the blanks:
(a) The.................... devices refer to devices that are used to select items on the screen.

(b) A ................ refers to the electronic version of an output, which resides in computer memory
or on disk, and is displayed on a screen.
(c) The ................ display is based on a television technology.
(d) The ................ printers are also known as phase-change printers.
(e) When a particular image is displayed for a long period of time, ................. accumulate inside
the LCD and are seen in the image that is displayed on the LCD screen.
3. Select a suitable choice in every question:
(a) Which of the following is an input device that can be rotated in any direction by fingers or
palm?
(i) Joystick
(ii) Trackball
(iii) Mouse
(iv) Light pen
(b) Which of the following is a CRT with a long persistence phosphor?
(i) Random Scan display

(ii) Calligraphic Refresh Display
(iii) Raster Scan Display
(iv) Direct View Storage Tube Display
(c) Which of the following is a printer that employs a printing process that uses heat to transfer
dye to a medium, such as a plastic card, paper or canvas?

(i) Dye-sublimation printer
(ii) Liquid Inkjet Printers
(iii) UV printers
(iv) Inkless printers
(d) The term …………………. refers to the display screen which is being updated and refreshed.
(i) Aspect ratio

(ii) Underscan
(iii) Refresh-rate
(iv) Overscan

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