3.14.6 Practice Questions
You need to replace the power supply in your home desktop computer. Which of the following specifications are the MOST likely to affect your power supply choice? (Select three.)
- Type and number of connectors - Output wattage - Form factor
A computer's power supply converts main AC to low-voltage regulated DC power for the internal components. You are building a new computer, and you are deciding which type of power supply to install. Which of the following definitions BEST describes a valid type of power supply?
A dual-rail power supply provides separate rails (PCB traces) to balance the power load between multiple circuits (this prevents any one circuit from becoming overloaded).
Your company relocated you from the United States to their United Kingdom office in London. You brought your personal computer with you, and you are in the process of setting it up. Your computer was previously configured to receive 115 VAC, but the electricity in London uses 230 VAC. Which of the following would allow your computer to run on 230 VAC?
Inspect the power supply unit for a manual voltage switch and move it to 230 VAC. Otherwise, no action is necessary.
Which of the following components converts AC power to DC power?
Power supply
You are servicing a client's computer that has been randomly restarting. You decide to test the power supply voltage on the 12 V rail using a multimeter. Which of the following BEST describes the action you should take based on the multimeter reading shown below? 10.25 on the UT52 Multimeter
Replace the power supply because it is failing.
Which of the following connectors provides additional power to the CPU from an ATX power supply using the fewest pins? (Select the correct connector.)
The answer is A. Starting with the Pentium 4 (P4) processor, CPUs required more power than could be provided through the ATX power plug. The 4-pin 12 V connector connects to the motherboard and provides two dedicated 12 V wires to the CPU (older processors only used 5 V power). This 4-pin 12 V CPU connector is not the same as the 20+4-pin ATX power connector. The rest of the listed connectors serve the following purposes: B - An 8-pin EPS12V CPU power connector that is used to provide four lines of 12 V power. C - A 6+2-pin PCIe connector that provides additional dedicated power to newer video cards. D - A SATA power connector that provides power to SATA devices (such as hard drives).
You have just installed a new video card in your desktop computer for gaming purposes. Which of the following power supply connectors is designed to provide additional dedicated power to your new video card? (Select the correct connector.)
The answer is C. Newer video cards require more power than can be supplied through the PCI Express bus. The 6+2-pin PCIe connector plugs directly in to the video card to supply additional dedicated power. The rest of the listed connectors serve the following purposes: A - A 4-pin 12 V (P4) power connector that is used to provide two lines of 12 V power to the CPU. B - An 8-pin EPS12V CPU power connector that is used to provide four lines of 12 V power. D - A SATA power connector that is used to provide power to SATA devices such as hard drives.
You have just installed a new hard drive in your desktop computer. Which of the following power supply connectors is designed to provide power to your new hard drive? (Select the correct connector.)
The answer is D. A SATA power connector has 15 pins and provides 3.3, 5, and 12 volts. It is used to provide power to storage devices such as hard drives. The rest of the listed connectors serve the following purposes: A - A 4-pin 12 V (P4) power connector that is used to provide two lines of 12 V power to the CPU. B - An 8-pin EPS12V CPU power connector that is used to provide four lines of 12 V power. C - A 6+2-pin PCIe connector that provides additional dedicated power to newer video cards.
You have a desktop computer that provides a 250-watt power supply. You recently added a four-disk RAID 10 array to the system, and now it spontaneously shuts down. Which of the following would MOST likely solve this issue?
Upgrade to a power supply that provides more watts.
You are building a new computer from both new and used parts. The video card is a PCIe video card that requires an 8-pin power connector. However, your power supply does not have an 8-pin PCIe power connector. Which of the following solutions would be the least expensive option for your system?
Use an adapter cable to connect two 4-pin Molex connectors to the 8-pin PCIe connector.
