Chapter 2 - Input and Output Devices Flashcards
1
Q
What are the two different types of keyboards
A
QWERTY
Ergonomic (used by people who have carpal tunnel syndrome/RSI)
2
Q
What are 2 uses of keyboards
A
Input of data into applications software
Typing in commands to the computer
3
Q
List 3 advantages of keyboards
A
Fast entry
Easy to use
Easier to do verification checks as data is entered
4
Q
List 3 disadvantages of keyboards
A
Difficult to use if user has limited arm/wrist use
Slow method compared to DDE (direct data entry)
Fairly large device that uses up desk space
5
Q
What is a “Concept keyboard”
A
Uses icons/phrases instead of standard letters
fast data entry
waterproof keyboard
6
Q
Where are concept keyboards used
A
Restaurants
7
Q
What is a “Numeric keypad”
A
Enter numbers only
8
Q
What are 5 uses of numeric keyboards
A
ATMs (Automatic Teller Machines) Mobile phones POS (Point-of-Sale) terminals Chip and PIN devices Fast entry of numeric data in a spreadsheet
9
Q
List 2 advantages of numeric keypads
A
Faster than standard keyboards
Portable
10
Q
List 2 disadvantages of numeric keypads
A
Small keys - hard to input
Order of numbers on keypad isn’t intuitive
11
Q
List 4 uses of a mouse
A
Opening/closing/minimising software
Grouping/moving/deleting files
Image editing
Controlling position of pointer
12
Q
List 3 advantages of a mouse
A
Faster way
Quick way to navigate through applications and internet
Doesn’t require large desk area
13
Q
List 3 disadvantages of a mouse
A
Can be difficult if user has restricted hand/wrist movement
Easy to damage
Difficult to use if no flat surface is available
14
Q
List 2 advantages of touchpads
A
Same as mouse
Integrated in laptop - no need to carry extra pointing device
15
Q
List 3 disadvantages of touchpads
A
Difficult to use for people with limited hand/wrist movement
Difficult to control
Difficult to use (drag and drop)
16
Q
List 3 uses of trackerballs
A
Applications where user has disability (RSI)
Used in control room environment - faster
Used in luxury cars
17
Q
List 5 advantages of trackerballs
A
Doesn't need same fine control Easier to use if operator is disabled More accurate positioning More robust Less desk space required
18
Q
List 2 disadvantages of trackerballs
A
not supplied with computers - more costly
May need training
19
Q
What is a “Remote control”
A
Controls operation of other devices remotely using infrared signals
20
Q
List 3 uses of remote controls
A
Tv, satellite, DVD
Multimedia
Industrial
21
Q
List 2 advantages of remote controls
A
Operated from reasonable distance
Safe to operate
22
Q
List 2 disadvantages of remote controls
A
Difficult to use if user has limited hand/wrist movement
Easy to block signal
23
Q
List 2 uses of a joystick
A
Video games
Simulators
24
Q
List 2 advantages of joysticks
A
Easier than keyboard to navigate
Control is more realistic
25
What is a disadvantage of a joystick
More difficult to control
26
List 2 uses of a driving wheel
Video games
| Simulators
27
List 2 advantages of a driving wheel
Easier than keyboard/joystick to control steering movements
| Driving experience
28
List 3 disadvantages of a driving wheel
Expensive
Movements can be too sensitive
Unless it's an expensive simulator - feedback to the driving wheel is non-existent
29
List 8 uses of touch screens
```
Self-service tills
ATMs
POS
PDAs (Personal digital assistants)
Public information systems at airports
Interactive whiteboards
CBT (Computer-based training)
output device - can also be flat-screen monitor
```
30
List 3 advantages of touch screens
Faster entry of options
Easy method to choose options
User-friendly
31
List 3 disadvantages of touch screens
Limited number of options
Lead to problem if user has RSI
Screen can get dirty
32
What is a "Scanner"
Enter information from hard copy into a computer
33
List 4 uses of scanners
Scan documents
Scan in old/valuable documents - protects originals
Scan photographs
Scan barcodes
34
List 3 advantages of scanners
Images can be stored for editing
Much faster and more accurate than typing in documents
Possible to recover damaged documents
35
List 2 disadvantages of scanners
Quality can be limited
| Can be slow at scanning
36
List 4 advantages of digital cameras
Easy to produce good quality photos
Faster to upload
No need to develop film and print out photos
Memory cards can store several hundred photographs
37
List 4 disadvantages of digital cameras
Computer literate
Artistry lost
Resolution isn't good
Images need to be compressed to reduce amount of memory used
38
List 2 advantages of using DV (Digital Video) cameras over traditional video cameras
Easy to manipulate video footage using specialist software
| DV format gives higher quality of image
39
List 4 uses of microphones
Input speech
Input voice recognition
Sensor to pic up sound (alarm system)
Video conferencing or VoIP
40
List 3 advantages of microphones
Faster to read text
Can manipulate sound in real life
Improving safety if used in voice-activation system
41
List 2 disadvantages of microphones
Sound files can use up computer memory
| Voice recognition isn't accurate
42
What are temperature sensors used for
Auto washing machines
central heating systems
automatic glasshouses
Ovens
43
What are pressure sensors used for
burglar alarm systems
washing machines
robotics
environmental monitoring
44
What are light sensors used for
automatic glasshouses, automatic doors
burglar alarm systems
street lighting
control
45
What are sound/acoustic sensors used for
burglar alarm systems monitoring liquid
| powder flow in pipes
46
What are humidity/moisture sensors used for
automatic glasshouses
environmental monitoring
used in factories where
moisture levels are crucial
47
Where are pH sensors used for
automatic glasshouses
chemical processes
environmental monitoring
48
List 3 advantages of sensors
Accurate readings
Continuous
Automatic
49
What is a disadvantage of sensors
Spurious results
50
List 3 uses of a graphics tablet
Drawings
Input faster than typing
CAD
51
List 3 advantages of graphics tablet
Possible to modify drawings after input
Accurate
Record pressure
52
List 5 disadvantages of graphics tablet
```
Expensive
Longer to produce
Menus aren't user-friendly
Larger drawings
Touch screens are damaged easily
```
53
List 2 uses of webcams
Personal way of chatting online
| Video conference
54
List 2 advantages of webcams
Left on constantly
| Allow people to keep in contact
55
List 2 disadvantages of webcams
Limited features
| Need to be connected to computer
56
List 2 uses of lightpens
Selecting objects on CRT screen
| Drawing on screen
57
List 3 advantages of lightpens
Greater accuracy
Small
Easy-to-use tech
58
List 4 disadvantages of lightpens
Lag
Only works on CRT monitors
Bad accuracy
Dated tech
59
List 2 uses of magnetic stripe readers
Credit cards for ATM
| Security device
60
List 6 advantages of magnetic stripe readers
```
Fast data entry
Error free
Secure
Prevents access to restricted areas
Not affected by oil/water/moisture
No moving parts - physically robust
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61
List 3 disadvantages of magnetic stripe readers
If it gets damaged, data is lost
Doesn't work at a distance
Information isn't human readable
62
List 5 advantages of contactless card readers
Faster transaction
The system uses 128-bit encryption to protect data
Customers do not have to worry about typing errors
Retailers no longer have access to the customer's credit/debit card information
The chip in the contactless credit card responds to the payment terminal reader with a unique number used for that transaction only
63
List 5 disadvantages of contactless card readers
They are more expensive than normal credit/debit cards
A thief with a suitable reader could monitor your con tactless card transaction
while standing at the counter with you
Can take money twice if the customer uses it as a chip and PIN card
Transactions are usually limited to a small maximum value
Transactions have been carried out without the card holder being aware of this while they were just standing in the payment queue
64
What is a use of chip and pin readers
Payments
65
List 2 advantages of chip and pin readers
Secure
| Robust
66
What is a disadvantage of chip and pin readers
Fraud
67
What is RFID
Radio Frequency Identification Reader
68
List 4 uses of RFID
Livestock tracking
Retail
Several tags can be read at the same time, thus
speeding up the checkout process
Admission passes
Libraries - no need to scan barcodes or magnetic stripe cards, making the process quicker and more accurate).
69
List 5 advantages of RFID
No line-of-sight contact is necessary; the tags can be read from a distance
It is a very robust and reliable technology.
Very fast read rate
Bidirectional data transfer
Bulk detection is possible
70
List 4 disadvantages of RFID
```
Tag collision (this is when the signals from two or more tags overlap
interfering with each other).
Because RFID uses radio waves, they are relatively easy to jam or interrup
It is relatively easy to hack into the data/signal transmitted by the tag.
RFID is more expensive than a comparable barcode system
```
71
What is MICR
Magnetic ink character recognition
72
What is a use of MICR
Process cheques at a bank
73
List 3 advantages of MICR
Greater security
No manual input - no errors
Magnetic ink can be read if somebody writes over them
74
List 2 disadvantages of MICR
Only certain characters can be read
| More expensive than other methods used in DDE (Direct Data Entry)
75
What is OMR
Optical Mark Recognition/reader
76
What is a use of OMR
Read questionnaires/multi choice exam papers
77
List 3 advantages of OMR
Fast input
Accurate - no typing
More accurate than OCR methods
78
List 2 disadvantages of OMR
Forms need to be carefully designed to make sure marks are correctly positioned to gather accurate information
Can be problems if forms haven't been filled correctly
79
What is OCR
Optical Character Recognition
80
What is a use of OCR
Processing passports and identity cards
81
List 2 advantages of OCR
Fast data entry
| No manual data entry - no errors
82
List 2 disadvantages of OCR
Difficulty reading handwriting
| Not very accurate technique
83
List 2 uses of barcode readers
Supermarkets
Libraries
Safety function in companies
84
List 4 advantages of barcode readers
Faster than keying in data
Records data - safety
Auto stock control
Trusted tech
85
List 3 disadvantages of barcode readers
Expensive
Not foolproof
Can be easily damaged than RFID tags or magnetic strips
86
What is QR code
Quick response code
87
List 2 advantages of QR codes
No need for user to write down/key in website address - auto by scan
Stores website addresses/URLs that appear
88
What is CRT monitor
Cathode Ray Tube monitor
89
List 2 uses of CRT monitors
Primary output device
| Lightpens
90
List 2 advantages of CRT monitors
Angle of viewing is better than TFT monitors
| Work with light pens
91
List 4 disadvantages of CRT monitors
Heavy
Run very hot
Consume more power
Flicker - causes headaches
92
What is TFT monitor
Thin film transistor monitor
93
List 2 uses of TFT monitors
Primary output device
| Integral part of laptop computers
94
List 3 advantages of TFT monitors
Lightweight
Less glare
Less power consumption
95
List 2 disadvantages of TFT monitors
Angle of viewing is critical
| Definition isn't as good at CRT monitor
96
What is LCD monitor
Liquid crystal display/diode
97
What is LED monitor
Light emitting diode
98
What is CCFL
Cold Cathode Fluorescent Lamp
99
What is "Multimedia projectors"
Receive signals that can be analogue or digital
100
List 3 uses of multimedia projectors
Training presentation
Advertising presentations
Home cinema systems
101
List 2 advantages of multimedia projectors
Enables people to see presentation rather than crowding around a computer screen
Avoids need for several networked computers
102
List 3 disadvantages of multimedia projectors
Images may be fuzzy at times
Expensive
Setting up projector can be difficult
103
What is a "Laser printer"
Produces high quality hard copy output
104
List 2 uses of laser printers
Used where low noise is requried
| Best for fast, high quality, high volume printing
105
List 3 disadvantages of laser printers
Only fast if several copies are made
Colour are more expensive
Produces ozone and volatile organic compounds
106
What is an "Inkjet printer"
Produces good quality hard copies
107
List 3 uses of inkjet printers
Low output volumes are required
Best for high quality printing
3D inkjet printers are now being used in industry to produce protypes
108
List 4 advantages of inkjet printers
High quality output
Cheaper to buy than laser printers
Lightweight small footprint
Doesn't produce ozone and volatile organic compounds
109
List 4 disadvantages of inkjet printers
Slow output if several copies are needed
Can't do large print jobs
Printing can smudge
Can be expensive
110
What is a "Dot matrix printer"
Type of impact printer where print head presses against inked ribbon
111
List 2 uses of dot matrix printers
Noisy environment
| Environment where impact printers are of value (producing wage slips)
112
List 4 advantages of dot matrix printers
Can be used in environments that are dirty (not applicable for inkjet and laser)
Carbon copies/multi-part outputs can be produced
Cheap to run and maintain
Easy to use
113
List 3 disadvantages of dot matrix printers
Very noisy
Costs more than injket to buy initially
Very slow and poor quality printing
114
What is a "3-D printer"
Can produce solid objects that actually work
115
What is the use of "Direct 3-D printing"
Uses inkjet technology
116
List 5 advantages of 3-D printing
Possible to produce any product a user wants
Manufacture items quickly
Less cost compared to labour and other costs
Medical benefits (prosthetic)
Parts for machinery that can no longer be made can be manufactured using 3D printers
117
List 3 disadvantages of 3-D printing
Potential to make counterfeit items that infringe others' copyright
Can create anything with a 3-D printer - dangerous
Job losses
118
List 3 uses of speakers
Output sound
Play downloaded sound files
Audio output of text on the screen that helps users with disabilities
119
What is an "Actuator"
Transducers used to take signals from a computer and converts them into some form of motion (motors/pumps/switches/valves)
120
List 3 uses of an actuator in a motor
Auto washing machines
Control robot arms in industry
Computers to control fans/disk drives/DVD drives
121
List 2 uses of an actuator in a buzzer
Cookers/ovens
| Burglar alarm system
122
List 2 uses of an actuator in a light
Security lights
| Glasshouse to connect lightning conditions
123
List 4 uses of an actuator in a heater
Auto washing machines to heat up water
Auto control temperature
Control heating in a central heating system
Temperature control in an auto glasshouse
