Chapter 1/ Introduction to Computers

Question 1

What is the decimal value of the hexadecimal character C?

Answer 1

12

Question 2

How many bits are in a byte?

Answer 2

8

Question 3

What does FRU mean?

Answer 3

Field replaceable unit

Question 4

What are the two most common sizes of case fan?

Answer 4

80mm and 120 mm

Question 5

A computer has become louder and slower. What is a common solution?

Answer 5

Clean it.

Question 6

For a power supply what are the volts on each of the color wires?

Answer 6

Black = Ground, Orange = 3.3v, Red = 5v, Yellow = 12v, Blue = -12v

Question 7

Why shouldn’t laser printers be plugged into an UPS?

Answer 7

They draw to much power.

Question 8

What voltages are provided by an ATX power supply?

Answer 8

3.3v, 5v, 12v, -12v

Question 9

What should you check if you have hard drives frequently failing?

Answer 9

the 12v rails

Question 10

What type of Fire Extinguisher should you use on an electrical fire?

Answer 10

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.

Question 11

What can be used to protect against ESD?

Answer 11

Controlled humidity, antistatic wrist straps, and antistatic mats

Question 12

What includes first-aid steps to take if cleaning supplies cause harm to a person?

Answer 12

MSDS

Question 13

Why can’t one use a regular vacuum to clean a computer?

Answer 13

Regular vacuum cleaners and their attachments can ESD damage to systems.

Question 14

What should you use to clean out a computer case?

Answer 14

compressed air, or a computer vacuum that doesn’t generate static

Question 15

What can you use to verify a power supply is providing 12 VDC to a system?

Answer 15

a multimeter

Question 16

What are the three functions of a computer?

Answer 16

input, processing and output, often shortened to I/O

Question 17

What does the P1 power plug do?

Answer 17

it is the primary power connector for the motherboard and includes 20 or 24 pins.

Question 18

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

Answer 18

D. Case fan

Question 19

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

Answer 19

D. Motherboard

Question 20

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

Answer 20

A. 600 W

Question 21

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

Answer 21

C. 115 VAC

D. 15 VDC

Question 22

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

Answer 22

B. 5 V and 12 V

Question 23

Which of the following can you use to protect against power sags?
A. Commercial power
B. Power supply
C. UPS
D. MSDS

Answer 23

C. UPS

Question 24

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

Answer 24

A. ESD wrist strap

D. ESD Mat

Question 25

``` 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 ```

Answer 25

B. Multimeter

Question 26

``` 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 ```

Answer 26

D. Compressed Air

Question 27

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

Answer 27

B. Carpet

Question 28

``` 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 ```

Answer 28

A. MSDS