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Teste Comp Studies Anna > Output Devices > Flashcards

Output Devices Flashcards

1
Q

What is the function of an output device?

A

help transfer processed data to users

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2
Q

What formats can output devices display?

A

images, sounds, videos, machine coded output

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3
Q

What are some examples of output devices?

A

printers
cutters
actuator
monitors
speakers
projectors
headphones

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4
Q

What is the function of printers?

A

creates paper (hard) copies of documents and images

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5
Q

Briefly, how do inkjet printers work?

A

utilize ink cartridges to spray tiny drops of ink at any paper to form an image

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6
Q

In an inkjet printer, what is a print head?

A

a part that consists of nozzles, which spray small drops of ink onto the paper to form different characters

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7
Q

In an inkjet printer, what are ink cartridges?

A

cartridges that each consist of a group for each colour

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8
Q

What are the different colours of the cartridges?

A

blue, yellow, magenta and black

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9
Q

In an inkjet printer, what is the stepper motor and belt?

A

a part which moves the print head assembly across the page

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10
Q

In what direction does the stepper motor and belt move the print head assembly?

A

side to side

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11
Q

In an inkjet printer, what is the paper feed?

A

a part that automatically feeds the printer with paper, as necessary

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12
Q

What are the two technologies used to produce ink droplets?

A

thermal bubble and piezoelectric

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13
Q

What are the benefits of buying an inkjet printer?

A

It is cheap
Can produce high-quality images

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14
Q

What is the main disadvantage of an inkjet printer?

A

It is slow

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15
Q

In a thermal bubble, what must happen so that ink droplets are produced?

A

Tiny resistors produce heat
Heat causes ink to vaporise
Bubble of ink is ejected from the printer head, onto the paper
When the bubble of ink collapses, a vacuum is created
This vacuum draws fresh ink from the print head

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16
Q

In a piezoelectric, what must happen so that ink droplets are produced?

A

Crystal at the back of the ink reservoir is given an electric charge
A vibration is created
This vibration forced the ink to be ejected onto the paper

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17
Q

What is the printing process, in an inkjet printer, in 8 steps?

A
  1. Data sent to printer driver
  2. Printer driver checks format
  3. Driver checks availability of printer
  4. Data sent to buffer
  5. Sensor checks paper feed tray
  6. Printer head moves from side to side and ink of four colours are sprayed in correct proportion to get desired colour
  7. Once line is completed, paper moves slightly to print new line
  8. Previous process is repeated until buffer is empty
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18
Q

Briefly, how does a laser printer work?

A

Uses laser to apply a static charge to areas on the paper. The toner is attracted to this charge and sticks to paper, forming an image

19
Q

What type of ink does a laser printer use?

A

Powder ink

20
Q

What are the advantages of buying a laser printer?

A

Prints whole page in one go
Carries large print job
Fast
Does not run out of ink halfway
High quality

21
Q

What are the disadvantages of buying a laser printer?

A

Expensive
Worse colour gradation

22
Q

In a laser printer, what is the printing process in around 11 steps?

A
  1. Data sent to printer driver
  2. Printer driver checks format
  3. Driver checks availability of printer
  4. Data sent to buffer
  5. Printer’s photosensitive drum gives a negative charge
  6. A laser beam is used to discharge areas
  7. Toner, fine powder are attracted to areas of drum exposed to laser
  8. Toner transferred from drum to paper using positive charge
  9. Toner is melted onto paper using heat and pressure
  10. Residual toner is removed from drum to prepare it for the next job
  11. Printed paper is outputed
23
Q

What is the toner, in a laser printer?

A

A powdered ink

24
Q

What is a 3D printer used for?

A

Computer aided design to produce solid objects out of several materials

25
Q

How is a design in a 3D printer made?

A

By using a CAD

26
Q

What happens when a printer runs out of paper?

A

A signal called an interrupt is sent to the processor to request that the problem is fixed

27
Q

How is a 3d object built?

A

Layer by layer

28
Q

What are examples of material a cutter can cut through?

A

Glass, crystal, metal, wood…

29
Q

_____ design can be cut using _____

A

Complex, software

30
Q

In a cutter, what is used to recognize the object?

A

coordinates

31
Q

In loud speakers and headphones, what happens to digital data stored in a computer?

A

It is converted to analogue data, that can vibrate a cone in a speaker (DAC)

32
Q

In a loud speaker/headphone, how is the soundwave passed?

A

Through amplifier

33
Q

What is the DAC?

A

digital to analogue converter

34
Q

What is the sampling rate?

A

Rate at which digital data is converted to analogue data ata a DAC

35
Q

What does it mean when a sampling rate is at 16-bit?

A

44100 samples per second- the DAC can convert 44100 values in range

36
Q

What is an actuator?

A

Component that makes you things move or perform specific actions in response to signal or input LCD and LED

37
Q

What is the LCD?

A

Liquid crystal diode/display

38
Q

What have LCDI monitors replaced?

A

Cathode-ray monitors

39
Q

What are two advantages of LEDs over CCF-L technology?

A

LED reaches maximum brightness almost immediately
LEDs gives a whiter light, sharpens image and makes color vivid

40
Q

What does futuristic LED technology use? Briefly, how does it work?

A

Organic light- Organic compounds to create semiconductor that are flexible

41
Q

What is the function of a projector?

A

used to display images and videos on
large areas

42
Q

Projectors are useful when output needs to be viewed by _____ ____

A

Many people

43
Q

What do LCD projectors do? How do they work?

A

Sandwich crystals between two sheets of glass.
White backlight illuminates screen from behind
When crystals are solid, light cannot pass through
When an electrical current is applied to the crystals, light passes through and an image is formed

44
Q

What is an LCD array?

A

Millions of pixels that can be polarized to let through a certain amount of light

Teste Comp Studies Anna (2 decks)

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