A+ Guide to Managing & Maintaining Your PC, 8th Edition solutions manual and test bank and lab manual by Jean Andrews
Chapter 2
Working Inside a Computer
Lab 2.1 Take a Computer Apart and Put It Back Together
Review Questions
1. When removing the cover, why should you take care to remove only the screws that hold the cover on?
Answer: The power supply retention screws are often accessible from the outside of the case; if they are removed from the power supply, they could damage other components by falling on them.
2. How should you rock a card to remove it from its slot? Why is it important to know how to rock a card correctly?
Answer: Rock the card lengthwise. If you rock the wrong way, you could damage the card or slot.
3. What should you do to help you remember which components connect to which cables?
Answer: Take notes, make a sketch, take a photo, attach labels, and so forth.
4. What marking on a ribbon cable identifies pin 1?
Answer: A colored stripe on one side of the cable identifies pin 1.
5. What component(s) defines the system’s form factor?
Possible answers: The power supply, the backplate, the spacing of the mounts for the motherboard, and the position of the expansion slots in relation to the CPU.
6. What form factor does your PC use?
Answer: The answer is based on the actual system.
7. Why would a PC technician ever have to change out a computer’s motherboard?
Answer: The motherboard might need replacing if it becomes damaged, such as when a trace on the board or a chip is damaged. Also, the board might need replacing when the CPU is upgraded or additional features are needed. For example, if the system requires a SCSI controller, the motherboard is upgraded to provide this on-board feature.
Lab 2.2 Measure the Output of Your Power Supply
Review Questions
1. What is the electrical voltage from the house outlet to the power supply?
Answer: It is usually 115V AC.
2. What voltages are supplied by the power supply on your system?
Answer: This answer might vary depending on form factor. The ATX voltages are +3.3V, +5 V, -12 V, and + 12V
3. What model of multimeter are you using?
Answer: This answer depends on equipment used.
4. List the steps to set your multimeter to measure resistance:
Answer: This answer depends on the multimeter.
5. Besides voltage and resistance, what else can your multimeter measure?
Answer: This answer depends on equipment used, but most likely will include continuity.
Lab 2.3 Choose the Right Power Supply
Review Questions
1. The estimated wattages for individual components were provided in the lab. How can you find the actual wattage for each component?
Answer: Look on the component or check the documentation.
2. What is the typical efficiency rating for a power supply?
Answer: 60% to 70%
3. Are there any connectors your system needs that the power supply doesn’t have? If so, what are they?
Answer: Answers may vary.
4. Are there any connectors provided by the power supply that your system isn’t using? If so, what are they?
Answer: Answers may vary.
5. Why is it important to buy a power supply that’s close to the requirements for your system instead of buying a higher wattage power supply?
Answer: Excess energy is wasted as heat.
- Why would you need to be concerned with your power supply having the capability of providing power directly to the PCIe card(s)?
Answer: Answer may vary depending on student’s experience. SLI capable video cards require 12 volts of electricity to be supplied directly from the power supply. Crossfire-capable video cards may also require the same kind of direct power in order to operate correctly.
Lab 2.4 Replace a Power Supply
Review Questions
1. How many connectors linked your original power supply to the motherboard?
Answer: Results will vary depending on equipment used.
2. How many watts of peak power could the original power supply provide?
Answer: Results will vary depending on equipment used.
3. Why is it important to be able to calculate the peak power required for all components? (You learned how to do this in Lab 1.7.)
Answer: To avoid drawing more power than the power supply can produce.
4. What are two reasons that PC technicians don’t usually repair a power supply?
Answer: The electricity inside a power supply can be dangerous and it’s generally not worth the time to fix a field replaceable unit.
5. What term is used to refer to components that are commonly replaced but not repaired?
Answer: Field Replaceable Unit (FRU)
6. What is the most efficient way to determine whether your power supply is bad?
Answer: Use a multimeter to measure the voltage being produced.
Lab 2.5 Measure Temperature and Adjust Fan Speed
Review Questions
1. Where does SpeedFan get the information it uses to monitor the computer?
Answer: From sensors embedded in the motherboard, processor, hard drives, and assorted other peripherals.
2. Why would you use a utility such as SpeedFan?
Answer: SpeedFan monitors your computer’s temperature sensors and will inform you if a device is running too hot (especially helpful to let you know if a hard drive is on the fast track to failure). Since heat can destroy vital system components the ability to monitor the temperature sensors is incredibly useful by itself.
3. In what situations would you want to adjust the speed of a fan on your computer?
Answer: to lessen fan noise; to improve cooling capacity of the system.
4. Is it possible to damage a computer with a utility like SpeedFan?
Answer: Yes. You could shut down all cooling on your computer and destroy all the components.
Chapter 2
Working Inside a Computer
1. When taking a computer apart, why is it important to not stack boards on top of each other?
You could accidentally dislodge a chip.
2. Why is it important to remove loose jewelry before working inside a computer case?
Because the jewelry might get caught in cables and components as you work.
3. When assembling a system, which do you install first, the drives or the motherboard?
Drives
4. What is the purpose of raised screw holes or standoffs installed between the motherboard and case?
To prevent a short that might happen if lines on the bottom of the motherboard touch the case when the system is running.
5. When installing the front panel wires to the motherboard front panel header, how do you know which pins to use for each wire if the pins on the header are not labeled?
You can find this information in the motherboard user guide.
6. What are the two major components of a processor cooler assembly?
Heat sink and fan
7. How many pins does the CPU fan header on a motherboard have?
4 pins
8. If the power connector from the CPU fan has only three pins, it can still connect to the 4-pin header, but what functionality is lost?
Adjustable speed control of the fan to lessen the noise in the system
9. How do you determine the wattage capacity needed by a power supply?
Add up all wattage requirements for all devices that will use the power supply and then add an additional 30%
10. Which one component in a high-end gaming computer is likely to draw the most power?
The video card
1. You disassemble and reassemble a computer. When you first turn it on, you see no lights and hear no sounds. Nothing appears on the monitor screen. What is the most likely cause of the problem? Explain your answer.
a. A memory module is not seated properly in a memory slot.
b. You forgot to plug up the monitor external power cord.
c. A wire in the case is obstructing a fan.
d. Power cords to the motherboard are not connected.
Answer: d. Power cords to the motherboard are not connected. All the other answers would still cause the system to start the boot even though it might fail. If the motherboard is not getting power, it will not start the boot.
2. How much power is consumed by a load drawing 5 A with 120 V across it?
600 watts
3. What is a reasonable wattage capacity for a power supply to be used with a system that contains a DVD drive, three hard drives, and a high-end video card?
a. 250 watts
b. 1000 watts
c. 700 watts
d. 150 watts
Answer: c. 700 watts
No comments:
Post a Comment