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Comptia a+ 220-1101 > . > Flashcards

. Flashcards

1
Q

Types of regulations

A

Health and safety laws
Building codes
Environmental regulations

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2
Q

Prime example of safety regulations for US- based operations

A

OSHA

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3
Q

Definition for ground

A

A safe path for electrical current to flow away in case a device or cable is faulty

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4
Q

Are most pc circuits high or low voltage/current

A

Low voltage/current

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5
Q

Black box

A

Power supplies
CRT monitors
LCD display inverter card
Laser printers

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6
Q

Electrical fire safety protocol

A

Look for fire extinguishers with a K and black label

Cut power supply

Know where master switch is

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7
Q

ESD definition

A

A situation that occurs when electrons rush from one partially charged body to another with an unequal charge, following the path of least resistance

High voltage, low current

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8
Q

What volts do human feel ESD at

A

2500V

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9
Q

What Volts does equipment be damaged at

A

100V

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10
Q

ESD generators

A

Synthetic clothing
Low humidity
Cool temps

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11
Q

Self grounding definition

A

The act of touching a grounded object before touching electronic equipment

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12
Q

Have to ground yourself before touching electronic equipment

A
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13
Q

Protecting components from ESD damage

A

Drain body and clothing of static electricity before work

Work in an uncarpeted area

Self grounding by placing all fingers on the computer case - drains out ESD

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14
Q

Describe the equipment you should use to prevent static electricity on your body from damaging the equipment on which you are working

A

Anti- ESD wrist/leg wrap, grounding cord and plug and a conductive mat

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15
Q

In which atmospheric conditions is ESD risk highest

A

Cool, low humidity conditions.
When humidity is high, static can dissipate through moisture present in the air

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16
Q

Which computer component presents most danger from electrical shock

A

Power supply

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17
Q

Tower case options and motherboard sizes

A

Full tower - ATX motherboard

Mid tower- micro ATX motherboard

Mini tower- micro ATX motherboard

Small form factor cases (SFF)

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18
Q

FRU definition

A

Adapter or component that can be replaced by technician on site. Most laptop and PC components are FRUs, whereas components of smartphones are not

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19
Q

Guidelines for PC disassesmbly

A

• Back up all data on an interval drive
• have clean work environment
• have necessary tools/equipment
Have camera so you can take pic of state of motherboard so you remember how to put together

• make sure devices are powered off (hold down on power supply which will drain computers power) and take anti static precautions

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20
Q

Motherboard definition

A

Provides basic foundation for computer’s hardware, including processor, RAM, firmware and expansion cards.

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21
Q

ATX size and no of expansion slots

A

12X9.6 inches

Up to 7 expansion slots

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22
Q

Micro ATZ size and no of expansion slots

A

9.6X9.6 inches square

Up to 4 expansion slots

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23
Q

Mini ITX size and no of expansion slots

A

6.7 X 6.7 square

One expansion slots
Used in SFF PCS

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24
Q

2 forms of CPU

A

PGA - pins
LGA - pads

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25
Q

RAM

A

Storage space for computer data and program instructions

Volatile memory that loses data when power is out

Packaged as DIMMS

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26
Q

Main function of chipset

A

Provides cotrollers for CPU to interface with other components

Controller types
• system memory
I/O
Integrated video, sound network interfaces

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27
Q

Are chipsets upgradeable or ungradeable

A

Ungradeable

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28
Q

CMOS battery definition

A

Battery that powers CMOS chip which tracks date and time
RTC Battery

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29
Q

Bus definition

A

Connections between components on the motherboard and peripheral devices attached to the computer

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30
Q

Traces

A

Wires etched on to the motherboard to provide electrical pathways

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31
Q

What are the electronic pathways used for

A

Carries data power and timing signals

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32
Q

Local bus

A

Internal bus that connects component to processor resulting in high data speed required by components such as video display

• internal bus connects core components

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33
Q

Expansion bus

A

External bus allows additional components to be connected to computer (peripherals)

34
Q

Expansion slot

A

Connection slots on motherboard where adapter cards can be installed to extend the functions the computer can perform

35
Q

Riser card

A

Space saving feature for expansion slots
Put it in sideways

36
Q

System clock

A

Computers timing mechanism that synchronises the operation of all parts of the computer and provides basic timing signal for CPU

37
Q

PCIE

A

Serial communication with point to pink links between I/O controllers

38
Q

PCIE versions

A

PCIE 2: 500mbps
PCIE3: 1Gbps per lane
PCIE4: 2Gbps per lane
PCIE5: 4Gbps per lane

39
Q

Describe how you would open a PC case to access motherboard

A

Power down PC, remove power cable, hold down power button for few seconds so PC de-energised.
Remove screws holding case cover

40
Q

What type if socket is used to instal memory

A

DIMMS

41
Q

Interface

A

The point at which two devices connect and communicate with each other

42
Q

Connection

A

Physical access point that enables a computer to communicate with internal/external devices

43
Q

USB - universal serial bus

A

Hardware interface providing connections for peripheral devices

44
Q

USB connectors and apeed

A

USB 1.1 - 12Mbs 5 metres length

USB 2.0 data rate 480Mbs

USB 3.0 - 5 Gbps (blue usb port)

USB 3.1 10Gbps

USB 3.2 20Gbps

45
Q

Other USB connectors

A

Type A (4-pin) connects to hosts

Type B (4-pin) connects to devices. Includes B mini and B micro

Type C connects to hosts and devices:
Usb C replaces all of these

46
Q

Thunderbolt 3 maximum speed and cable length

A

40 Gbps
Up to 2 metres,

47
Q

Thunderbolt 2 maximum speed and cable length

A

20Gbps
Up to 100metres

48
Q

USB 3.2 maximum speed and cable length

A

20 Gbps
Up to 1 metre for max speed

49
Q

USB 3.0 max speed

A

5 Gbps

50
Q

Lightning max speed

A

480 Mbps

51
Q

Usb 2.0 max speed

A

480 Mbps

52
Q

Whats DVI stand for

A

Digital visual interface

53
Q

Why would you install an I:O adapter card

A

To make more/diff kind of ports available

54
Q

KVM switch

A

Keyboard video mouse
• a switch supporting one set of input and output devices that control multiple PCs

55
Q

KVM switch

A

Keyboard video mouse
• a switch supporting one set of input and output devices that control multiple PCs

56
Q

Guidelines for installing peripheral devices

A

• always read the manufactures instructions and check that device is compatible with the PC and operation system

Hold the connector when removing a lead and inspect connector and port for damage

Don’t use excessive force

Check whether device requires external power source

57
Q

Whats likely cause of keyboard not working properly

A

Appropriate keyboard layout has not been selected in settings

58
Q

LCD - liquid crystal display

A

Digital signalling in the types of flat panel
Liquid crystal elements placed on thin film transistor

59
Q

Types of LCD

A

Twisted nematic
In-plane switching
Vertical alignment

60
Q

Twisted nematic

A

Original LCD technology
Fast response time (gaming)
Poor viewing angle

61
Q

In-plane switching LCD

A

Good colour representation
More expensive to produce than TN

62
Q

Vertical alignment LCD

A

compromise between TN and IPS

63
Q

OLED display

A

True black representation, computer will turn off
Made from plastic
Display can be curved

64
Q

Contrast ratio

A

Contrast between true black and true white
Higher contrast ratio, the better

65
Q

What is brightness measured in

A

Lumens/m2

66
Q

DVI - digital visual interface

A

Video adapter desigmed to replace VGA port
Can support digital only or digital and analog (DVI - D /I)

67
Q

HDMI - high definition multimedia interface

A

High specification digital connector for audio-video equipment

Version 1.4 supports 4k
Version 2.1 supports 10k at 120hz

68
Q

Display configuration issues

For no display

A

Verify connection power to monitor make sure its not in standby mode

Verify connection between video card and monitor

Use OSD controls to verify display input

Try use monitor with another PC

69
Q

Display configuration issues
For dim images

A

Adjust brightness and contrast controls and check for power save mode

70
Q

Display configuration issues
For
Image quality issues

A

Check video cable and connector
Adjust resolution refresh rate and image controls

71
Q

Display configuration issues
For oversized images

A

Increase resolution
Verify no zoom

72
Q

Display configuration issues
For colour quality issues

A

Calibrate to scanners and printers
Check connectors and cabling

73
Q

Most likely cause of a flickering display

A

On an LCD it could indicate problem with the backlight
Verify connectors are secure and cabling problems

74
Q

Audio subsystem

A

Made up of a sound card and 1/more I/O devices

75
Q

Basis of a soundcard

A

• digital signal processor chip which contains digital to analog converter

DACs convert digital signals generated by CPU to analog electrical signal

76
Q

Audio jack

A

Blue - audio in
Pink- mic in
Green- audio out
Black- audio out
Orange- subwoofer

77
Q

5.1 dolby digital

A

3 front speakers, 2 rear and subwoofer

78
Q

7.1 dolby digital plus

A

3 front speakers, 2 side, 2 read and subwoofer

79
Q

Sound recording equipment

A

Higher sampling rates and resolutions provide more accurate sound

Distortion (noise)
Noise levels are measured using total harmonic disruption and signal to noise ratio

THD measured as % SNR is decibels.
Lower numbers= better performance

80
Q

What size and colour connector would you look for to plug a basic microphone into PC

A

Pink connector

Comptia a+ 220-1101 (1 decks)

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