study guide Flashcards
What type of output does S/PDIF port provide
digital audio
Which is faster, Highspeed USB port or super speed USB port
Super speed
List 5 types of video ports
VGA, S-Video, DVI, HDMI, Display port
what is the purpose of an expansion slot on a motherboard?
to provide more ports than what is provided on the motherboard
What should be the setting for dual voltage selector switch on a power supply when using a computer in the U.S.?
115V
What unit of measure used to describe the amount of work a surge suppressor can do before it stops protecting the circuit from an electrical surge
Joule
Hot wires in home wiring are _____ and ground wires in computers are normally colored _____
Black, Black
What is the difference between a transformer and a rectifier? Which are found in a PC power supply?
Transformer- changes the ratio of current to voltage
Rectifier - converts AC volts to DC volts
both are found in a power supply
What device can you use to make sure a computer is protected against power surges?
A surge suppressor
A power supply receives 120 volts of ____ from a wall outlet and converts it to 3.3, 5, and 12 volts of ___ power.
AC, DC
Why is the power supply dangerous even after the power is disconnected?
The capacitors inside the power supply still hold an electrical charge even after being disconnected
Which two tools can a PC support technician use when taking apart a computer to best protect computer components against ESD?
A ground bracelet and a grounding mat or anti-static gloves
What is the purpose of a POST diagnostic card?
It tests if the BIOS can communicate properly with essential components
What three purposes are accomplished by the motherboard BIOS?
System BIOS- manages devices such as mouse and keyboard
Start up BIOS- used to start the computer
CMOS - used to change the settings or configuration of the motherboard
What is the best way to determine if a cable inside a computer is a data and instruction cable or a power cable?
Trace it back to its source
What technology standard provides up to four drives installed in a system?
PATA (IDE)
How many pins does the P1 connector have that uses the ATX Version 2.2 standard?
24 pin or 20 + 4 pin connector
What is the purpose of the 4-pin auxiliary connector on a motherboard?
It provides an extra 12 volts of power
What is the purpose of the 4-pin Molex connector
Used to power IDE drives
You purchase a new computer system that doesnt have wireless capability. you decide to use a wireless connection to the internet. what are the least expensive ways to upgrade your system?
purchase a wireless expansion card and install it into your system
purchase a USB wireless adapter and connect it to your PC by way of a USB port
How much power is consumed by a load drawing 5 A with 120 V across it?
600 watts, (5*120) (amps * volts)
when working on a computer, which of the following best protects against ESD? why?
Grounding bracelet clipped to the side of the case, it eliminates ESD between you and the case
You suspect the network port on a computer is not functioning, what tool do you use?
Loopback plug
The system fails at the beginning of the boot and nothing appears on the screen, what tool do you use?
A Post Diagnostic card