Output devices

Question 1

What is a printer?

Answer 1

A printer is a peripheral which produces a text and/or graphics of documents stored in electronic form, usually on physical print media such as paper or transparencies.

Question 2

What is a line printer?

Answer 2

It is a high-speed printer capable of printing an entire line at one time. A fast line printer can print as many as 3,000 lines per minute.

Question 3

Disadvantages of a line printer

Answer 3

The disadvantages of line printers are that they cannot print graphics, the print quality is low, and they are very noisy.

Question 4

What is a page printer?

Answer 4

Any printer that processes an entire page at a time. All laser and ink-jet printers are page printers, which means that they must have enough memory to store at least one page.

Question 5

What is an impact printer?

Answer 5

Work by banging a head or needle against an ink ribbon to make a mark on the paper. Considerably noisier than nonimpact printers but are useful for multipart forms such as invoices.

Question 6

What is a Non-impact printer?

Answer 6

A type of printer that does not operate by striking a head against a ribbon. Examples of nonimpact printers include laser and ink-jet printers.

Question 7

What is an LCD printer?

Answer 7

A type of printer similar to a laser printer. Instead of using a laser to create an image on the drum, however, it shines a light through a liquid crystal panel. Individual pixels in the panel either let the light pass or block the light, thereby creating an image composed of dots on the drum.

Question 8

Toner-based printers?

Answer 8

Use a xerographic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer’s photoreceptor.

Question 9

Liquid inkjet printers?

Answer 9

Operate by propelling variably-sized droplets of liquid or molten material (ink) onto almost any sized page.

Question 10

Solid ink printers?

Answer 10

a type of thermal transfer printer. They use solid sticks of CMYK-coloured ink, similar in consistency to candle wax, which are melted and fed into a piezo crystal operated print-head.

Question 11

Disadvantages of solid ink printers?

Answer 11

Drawbacks of the technology include high energy consumption and long warm-up times from a cold state. The resulting prints are difficult to write on

Question 12

Dye-sublimation printers?

Answer 12

Transfer dye to a medium such as a plastic card, paper or canvas. The process is usually to lay one colour at a time using a ribbon that has colour panels.

Question 13

Thermal printers?

Answer 13

Selectively heating regions of special heat-sensitive paper. Colours can be achieved with special papers and different temperatures and heating rates for different colours.

Question 14

UV printers?

Answer 14

Will use a special reusable paper coated with a few micrometres of UV light sensitive chemicals

Question 15

Advantages of CRT?

Answer 15

• High dynamic range, excellent color, wide gamut and low
  black level.
• Can display natively in almost any resolution and refresh rate
• No input lag
• Sub-millisecond response times
• Near zero color, saturation, contrast or brightness distortion.
• Excellent viewing angle.
• Cheaper
• Allows the use of light guns/pens

Question 16

Disadvantages of CRT?

Answer 16

• Large size and weight
• High power consumption
• Generates a considerable amount of heat
• Geometric distortion
• Can suffer screen burn-in
• Produces noticeable flicker at low refresh rates
• Hazardous to repair/service

Question 17

Advantages of LCD?

Answer 17

• Very compact and light
• Low power consumption
• No geometric distortion
• Little or no flicker depending on backlight technology
• Not affected by screen burn-in
• No high voltage or other hazards present during repair/service
• More reliable than CRTs
• No theoretical resolution limit

Question 18

Disadvantages of LCD?

Answer 18

• Limited viewing angle by variations in posture.
• Slow response times, which cause smearing and ghosting artefacts.
• Only one native resolution.
• Fixed bit depth
• Input lag
• Dead pixels may occur
• Uneasy replacement of the backlight
• Cannot be used with light guns/pens

Question 19

Advantages of Plasma?

Answer 19

• High contrast ratios, excellent color, and low black level.
• Virtually no response time
• Near zero color, saturation, contrast or brightness distortion. Excellent viewing angle.
• No geometric distortion.
• Highly scalable

Question 20

Disadvantages of Plasma?

Answer 20

• Large pixel pitch
• Image flicker due to being phosphor-based
• Heavy weight
• Glass screen can induce glare and reflections
• High operating temperature and power consumption
• Only has one native resolution
• Can suffer image burn-in
• Cannot be used with light guns/pens
• Dead pixels are possible during manufacturing

Question 21

Name 5 problems on monitors.

Answer 21

Phosphor burn-in
Plasma burn-in
Glare
Colour misregistration
Incomplete spectrum

Question 22

What are SSDs?

Answer 22

Solid-state storage is a nonvolatile, removable storage medium that employs integrated circuits (ICs) rather than magnetic or optical media. It is the equivalent of large-capacity, nonvolatile memory

Question 23

Advantages of SSDs?

Answer 23

convenient, compact, and fast.

typically less susceptible to physical shock, quieter, and have lower access time and latency.