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-ICT > Chap 1(Digital Devices) > Flashcards

Chap 1(Digital Devices) Flashcards

1
Q

Types of wireless connectivity device could use?

A

-Bluebooth
-Wi-Fi
-NFC
-Infrared
-Mobile Broadband

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2
Q

Mainframe vs Server vs Supercomputer

A

Mainframe: Carry out complex processing tasks such as statistical analysis and bulk data processing (By large organization)

Sever: Serving resources to clients as it needs in a network.

Supercomputer: used by scientists to calculate complex scientific and engineering calculation

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3
Q

Factors in quality of image

A

Lens: Allow lights to travel without any defects
Image processor: Compensate for poor lighting
Sensor: Capture in details (more pixels

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4
Q

Do GPS and Navigation Aids need internet?

A

Gps doesn’t. Navigation Aids needs to update map

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5
Q

Types of barcode and why one is better?

A
  1. Linear and Matrix
    2.Matrix can store more data and can be scanned from any angle.
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6
Q

Example of Single Board Computer and uses?

A
  • Raspberry pi
    -For educational purposes, Embedded Computing, Physical Computing
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7
Q

Embedded Computing?

A

Computing hardware that is fixed into position and carries out a specific task

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8
Q

Physical Computing?

A

Interactive system that can sense and respond to the world around them

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9
Q

Why GPS doesn’t need internet?

A

-It uses GPS(Global Positioning System)signal to receive location information from satellites using radio signals

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10
Q

Embedded systems how works

A

Camera & Sensor: Input from surrounding
Process: Microprocessor (Use Micro SD)
Output: Actuator

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11
Q

Types of interfaces

A

•Command Line Interface
•Menu Driven Interface(ATM)
(Take longer time as going through the menu structures)
•Graphical User Interface
•Voice interface
(Pros:Hands-free operation ->Road Safety)
(Cons: Language Barrier)
•Gesture interface
(Found with touch screen & Camera that sense gesture)
(pros: No language barrier)
(cons: Limited Distance from cam)

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12
Q

What’s expansion capabilities?

A

Expansion slots /ports for USB, Flash memory card and peripheral devices

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13
Q

How does microphone work?

A

-It uses diaphragm which moves when hit.
-When move, it produces analogue electrical signal and Sound Card converts it to digital signal.

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14
Q

Best biometric scanner?

A

-Iris(120 times than fingerprint)
(Retina is more accurate(70 times) but slower than iris and need to be closer to the scanner)

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15
Q

Dot Matrix

A

-Print head moves back and forth
-A ribbon of ink is impacted on paper to print words
-Carbon copy layers are used to make several copies of same document

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16
Q

Inkjet Printer

A

•A motor moves print ead across the page and the page through print area.
•Print head nozzle sprays droplets into page (using Thermal Bubble technology)

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17
Q

Laser Printer

A

A negatively charged paper is rolled and laser makes some area positively charged and roller on the other side has toner particles and toner is attach to the positively charged area and create image

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18
Q

Examples of Actuator(Control Device)

A

•Valves
•Pistons
•Heaters
•Coolers
•Motors

19
Q

Features of projector

A

•Light bulb
•Resolution
•Zoom functionality: Optical zoom(lens) & Digital zoom
•Portability

20
Q

Optical Media types and sizes

A

CD: 700 MB (2.11 Micrometers)
-Written to plastic layer beneath layers of aluminum and acrylic
DVD: single side:4.7GB ,double side: 18GB, red laser(1.32 micrometers)
Blu-Ray: Scratch Protection, single: 25GB ,double: 50GB, use violet laser (0.58 micrometers)

21
Q

What’s SIM?

A

Subscriber Identity Module(SIM) is used to identity the subscriber to a mobile phone network.

22
Q

Accessibility in specialist phone?

A

-Spoken aloud every feature and features-> Vision Impairment
-Few,Large buttons
-connections for hearing aids

23
Q

Wi-Fi name and function

A

Wireless Fidelity. A way of connecting computers to internet or network using radio signals

24
Q

What’s virtual keyboard?

A

A keyboard displayed on and used via a touchscreen

25
Q

Accessibility features from RNIB vds

A

-3 fingers double tap->Magnification (Zoom)
-Large Text features
-Invert Contrast (Color)
-High contrast mode
-Spoken aloud the selected app

26
Q

How are sensors used in game?

A

-Motion sensors to conteol the game with gestures and body movements.
-VR control-> replicate their movements in an avatar in VR

27
Q

Cons of handheld version of game

A

-to have less data-> Less complexity, limited story, reduce image and sound quality.

28
Q

Performance of digital device factors

A

-Faster processor (Clock speed)
-More RAM, faster RAM
-Faster Storage (Enable faster loading of instructions to RAM)

29
Q

Differences between Resistive Screen and Capacitive screen

A

Resistive:
•Pressure of presses causes two layers underneath the screen to touch and make a connection
•More Durable
•Harder to see(More layers->Reflect more light)
•Recognise one touchs at time(Not suitable for multi-touch applications)

Capacitive:
•By touching, charges flow from finger(conductive)
•The change in electrical charge is measured precisely
•Closer to charged areas(More current flows)
•Computer Calculate the precise location at which the screen was touched

30
Q

Factor of HDD access time?

A

•Speed of platters spin(RPM)
•Speed of read/write head move

31
Q

How does Voice interface work?

A

-Allow user to give command words
-With voice recognition software, matches spoken words against library of words to find a match.

Require Internet As library is stored online

Cons: Can’t find a match or returns incorrect match

32
Q

What can be used to connect an external drive?

A

Adapter

33
Q

How does RFID or NFC work,?

A

-Contain unique ID link to records in database

34
Q

Types of sensors?

A

•Light sensor
•Temperature sensor
•Humidity and moisture
•Distance and Proximity
•pH sensor
•pressure
•Motion and movement

35
Q

3D printer

A

Create by adding layers of heated material from bottom to top

36
Q

Professionals that use plotters

A

•Engineers
•Cartographer
•Architect
•Product designer

37
Q

How does plotter works?

A

-Pen move across the page to draw lines
-Pen can be raised and lower into paper
-Paper can be rolled backward and forward

38
Q

What does amplifier and multi speaker provide?

A

-Amplifer deliver diff levels of sound to each speaker(Provide spatial awareness)
-Multi speaker provide surround sound

39
Q

Why does Nav Aid needs internet?

A

-To update the current position on the map (map data)

40
Q

How does Navigation Aids work?

A

-Use info from GPS satellite to determine the exact location
-Calculate the best route between locations
-Updates the route if not follow accurately
-Use orientation sensor to know which way the device is pointing
-Visual Prompts and Alerts for drivers to take correct route

41
Q

How does GPS work?

A

Global Positioning System: radio signals from Satellites received by the device and calculate the exact location.

42
Q

What information can GPS calculate?

A

•Quickest/Shortest Route
•Distance travelled
•Distance to destination
•ETA
•Time to destination
•Speed
•Direction
•Steps taken

43
Q

Devices with many functions?

A

Multifunctional

44
Q

What does R-W mean in DVD R-W

A

Rewritable; Read-Write

-ICT (16 decks)

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