Chapter 1/ Introduction to Computers Flashcards
What is the decimal value of the hexadecimal character C?
12
How many bits are in a byte?
8
What does FRU mean?
Field replaceable unit
What are the two most common sizes of case fan?
80mm and 120 mm
A computer has become louder and slower. What is a common solution?
Clean it.
For a power supply what are the volts on each of the color wires?
Black = Ground, Orange = 3.3v, Red = 5v, Yellow = 12v, Blue = -12v
Why shouldn’t laser printers be plugged into an UPS?
They draw to much power.
What voltages are provided by an ATX power supply?
3.3v, 5v, 12v, -12v
What should you check if you have hard drives frequently failing?
the 12v rails
What type of Fire Extinguisher should you use on an electrical fire?
Class C. It uses Purple-K or carbon dioxide to extinguish the flames. Water can be dangerous because the current can travel upstream and electrocute you.
What can be used to protect against ESD?
Controlled humidity, antistatic wrist straps, and antistatic mats
What includes first-aid steps to take if cleaning supplies cause harm to a person?
MSDS
Why can’t one use a regular vacuum to clean a computer?
Regular vacuum cleaners and their attachments can ESD damage to systems.
What should you use to clean out a computer case?
compressed air, or a computer vacuum that doesn’t generate static
What can you use to verify a power supply is providing 12 VDC to a system?
a multimeter
What are the three functions of a computer?
input, processing and output, often shortened to I/O
What does the P1 power plug do?
it is the primary power connector for the motherboard and includes 20 or 24 pins.
A computer is making a lot of noise. Of the following choices, what is the likely problem? A. Faulty Motherboard B. USB Flashdrive C. Power supply set to the wrong voltage D. Case fan
D. Case fan
Another technician order a fan for a computer case. It has arrived, and you need to install it. The original fan has been removed. Where should connect the fan power connection? A. AC Outlet B. P1 power supply connector C. Front panel power D. Motherboard
D. Motherboard
A power supply failed after a technician added some hard drives to a desktop computer. You need to purchase and additional power supply. What is a likely power rating you'll purchase to ensure that the power supply doesn't fail again? A. 600 W B. 600 V C. 300 W D. 250 V
A. 600 W
Which of the following voltages are not provided by ATX-based power supplies? (Choose two) A. 12 VDC B. -12 VDC C. 115 VAC D. 15 VDC
C. 115 VAC
D. 15 VDC
Molex connector provide power to disk drives from ATX-rated power supplies. What voltages are supplied through the Molex connector? A. 3.3 V and 5 V B. 5 V and 12 V C. 5 V and 15 V D. 12 V and 15 V
B. 5 V and 12 V
Which of the following can you use to protect against power sags? A. Commercial power B. Power supply C. UPS D. MSDS
C. UPS
Which of the following can protect against ESD damage? (choose all that apply)
A. ESD wrist strap
B. Reducing humidity as much as possible
C. Ensuring that computer are stored on carpets whenever possible
D. ESD Mat
A. ESD wrist strap
D. ESD Mat
You want to verify that a power supply is providing proper voltages while it's connected to the P1 connector on the motherboard. What would you use? A. Surge suppressor B. Multimeter C. Power strip D. Power Supply tester
B. Multimeter
You open a computer to troubleshoot it an notice an excessive amount of dust inside it. Of the following choices, what is the best choice to clean it? A. Lint free cloth B. Vacuum cleaner C. Glass cleaner D. Compressed Air
D. Compressed Air
Which of the following can contribute to ESD damage?
A. Case fans
B. Carpet
C. Touching the computer Case while working on a computer
D. ESD mats
B. Carpet
After cleaning a computer screen with a cleaning compound, your fingers start to develop a rash. What can you use to quickly identify what was in the cleaning compound? A. MSDS B. Internet C. Local hospital D. Coworkers
A. MSDS
