3.2.6 Practice Questions Power Supplies

You have a desktop computer that you want to upgrade. You add several internal components and external components. You realize that you need to ensure that your power supply can support all of the new devices.

Which power supply rating is used to determine this? Watt rating Explanation The number of devices that can be supported by a power supply is directly related to the number of watts the power supply is rated for. A power supply's watt rating determines its maximum power output. AC voltage and DC voltage is a measure of electrical pressure, and is not directly related to the number of devices it will support. The voltage is dependent on the voltage of the wall socket. The voltage switch on the power supply should match the voltage at the wall outlet. 110 is used in the United States, while 200 is typically used in Europe. Resistance is a measure of how much an electrical device reduces the electric current flow through it.

You need to replace the power supply in your home desktop computer. As you choose the replacement power supply, which of the following specifications are the most likely to affect your choice?

Output wattage Form factor Processor connector Explanation When choosing a power supply: Select the power supply form factor that matches the motherboard and case form factor (AT,ATX, BTX, etc.). Make sure that the power supply has the correct power connector for your processor. Most newer processors require an additional 4-pin connector in addition to the 20-pin connector. Some motherboards combine these combine these connectors into a single 24-pin connector. Select a power supply with sufficient watts to power all devices. The higher the watts, the more internal external devices that can be supported. Nearly all power supplies can accept both 110 and 220 volts AC input. Use switch on the back to specify the input power. All power supplies output +/-5 and +/-12 volts DC power.

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 doesn't have an 8-pin. PCIe power connector. Which solution 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. Explanation Use an adapter cable to convert 4-pin Molex connectors to the connectors you require. You can typically purchase adapters for PCIe video, SATA power, or processor power cables. Purchasing a new power supply or video card would workout would be more expensive than using an adapter.

Which of the following components converts AC to DC?

Power supply Explanation A computer's power supply converts alternating current (AC) from the wall outlet to direct current (DC) used by the computer's internal components. A voltage regulator is an electronic device that supplies the appropriate voltage to a processor. It does not convert the power input from one form to another; it only ensures that the voltage remains at the appropriate level for the device. A surge protector protects a system from power spikes. A UPS (uninterruptable power supply) provides backup AC power using a reserve battery.

Which of the following voltages are provided by an ATX power supply.

5 12 3.3 Explanation An ATX power supply provides 3.3, 5, and 12 volts DC.

Your company relocated you to their United Kingdom office in London. You brought your personal computer with you and are in the process of setting it up. Your computer was previously configured to receive 110 V AC, but the electricity in London uses 230 v AC.

Toggle the voltage switch on the power supply to the different voltage. Explanation Most power supplies have the capacity to receive between 110 and 230 volt power just by toggling a switch (typically red) on the power supply casing. You can use this switch when using the power supply in other countries. 110 volts is used in the United States. 230 volts is used in Europe and the United Kingdom.

You have a motherboard that uses a 24-pin ATX connector.

Which types of power supply could you use with this motherboard?

A power supply with a 20-pin ATX and a +4-pin connector. A power supply with a 24-pin ATX connector only. Explanation In this case, the motherboard needs wither a 24-pin. When selecting a power supply, make sure it includes the necessary connectors for your motherboard. Specifically, some motherboards and processors require an extra 4-pin and/or 8-pin connector in addition to the main 20- or 24-pin power connector.

Which of the following functions does an ATX power supply perform?

Aids in thermal management. Converts AC to DC. Explanation Power supplies are responsible for powering every component in a computer system. Power supplies provide the following functions: Convert AV power to DC power. Provide internal components with 3.3 V, 5 V of DC power. Aid in thermal management. Surge protectors are used to protect power supplies and electronic components from power spikes. A UPS (uninterruptable power supplies) is used to provide backup power to a computer.

Which of the following devices use the 4-pin peripheral (Molex) connector?

Case fan PATA CD-ROM Explanation The 4-pin peripheral power connector (colloquially called a 4-pin Molex connector) is used by the following components: PATA CD-ROM IDE hard drives Case fans Solid state drives and SATA hard disk drives use SATA power connectors. If a CPU needs auxiliary power, it uses either a 4-pin 12 V (P4) connector or an 8-pin EPS12V CPU connector.

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?

Form factor Type and number of connectors Output wattage Explanation When choosing a power supply: Select the power supply form factor that matches the motherboard and case form factor (ATX, Micro-ATX, Mini-ITX, etc.). Male sure that the power supply has the correct type and number of power connectors for all of you devices. Select a power supply with sufficient watts to power all devices. The higher the watts, the more internal and external devices that can be supported. Nearly all power supplies can accept between 110 and 230 volts AC inout. Use the switch on the back to specify the input power. All power supplies output +/-5 and +/-12 volts DC power.

You are testing the power in a PC system by measuring the voltage available on the 4-pin Molex connector. The voltage on the red wire in +5.1 volts. What should you do?

Nothing, the power supply is working normally. Explanation The red wire on a Molex connector should provide +5 volts DC, so this power supply is functioning normally.

You have a desktop computer that uses a 250 watt power supply. You recently added a 4-disk RAID 10 array to the system and now it spontaneously shuts down. What should you do?

Upgrade to a power supply that provides more watts. Explanation The number of devices that can be supported by a power supply is directly related to the number of watts the power supply provides. In this situation, the new RAID array, along with all of the other components in the system, is drawing more watts than the power supply can provide. A watt is a rating of the amount of work that power supply can do. Volts is a measure of electrical pressure, and is not directly related to the number of devices it will support. The voltage is dependent on the voltage of the wall socket. The voltage switch on the power supply should match the voltage at the wall outlet. 110 is used in the United States, while 200 is typically used in Europe.

Which power supply feature helps prevent circuit overloads by balancing the current flow?

Dual rail Explanation Each separate voltage output circuit is referred to as a rail and can power multiple devices. To avoid overloading one circuit, many newer power supplies have two or more +12 volt rails. These are known as dual rail power supplies. Separate rails balance the power load between multiple circuits, preventing any one circuit from becoming overloaded. Cooling fans keep the power supply from over heating, but play no role in preventing circuit overloads. Some power supplies can automatically detect the voltage (115 which is used in North America or 230 which is used in Europe) so the switch is eliminated. Converting AC power (from the wall socket) to DC power (which then flows to the computer components) is simply the primary function of the power supply.

You are servicing a client's computer that has been randomly restarting. You decide to test the power supply using a multimeter. You connect the positive lead to the yellow wire on one of the Molex connectors.

Which action should you take based on the multimeter reading. (shown in the diagram)?

The power supply is failing and should be replaced. Explanation The power supply in this scenario is failing. Any time the voltage on the yellow wire of a Molex connector drops below about 11 volts, the power supply should be replaced. Switching the power supply to use 230 volts AC will not fix the issue. Low voltage issues aren't contained to a single connector, so even if you stop using that particular Molex connector, the system will still have problems.

An employee submitted a support ticket stating that her computer will not turn on.

Which of the following troubleshooting steps should you take first?

Make sure the power cord is plugged into the wall. Make sure the surge protector is turned on. Explanation When troubleshooting the power supply, always check the following before opening up the computer: Make sure the power cord is plugged into the wall. Verify any surge protectors are plugged in and in the on position. Make sure the power supply's switch is in the on position. Only after you identify the power supply is the problem should you replace it. The keyboard and mouse being unplugged in will not prevent the computer from powering on. Testing the power supply using a multimeter should be done only after the obvious has been ruled out.

3.2.6 Practice Questions Power Supplies - Subjecto.com

3.2.6 Practice Questions Power Supplies

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You have a desktop computer that you want to upgrade. You add several internal components and external components. You realize that you need to ensure that your power supply can support all of the new devices.

Which power supply rating is used to determine this? Watt rating Explanation The number of devices that can be supported by a power supply is directly related to the number of watts the power supply is rated for. A power supply’s watt rating determines its maximum power output. AC voltage and DC voltage is a measure of electrical pressure, and is not directly related to the number of devices it will support. The voltage is dependent on the voltage of the wall socket. The voltage switch on the power supply should match the voltage at the wall outlet. 110 is used in the United States, while 200 is typically used in Europe. Resistance is a measure of how much an electrical device reduces the electric current flow through it.

You need to replace the power supply in your home desktop computer. As you choose the replacement power supply, which of the following specifications are the most likely to affect your choice?

Output wattage Form factor Processor connector Explanation When choosing a power supply: Select the power supply form factor that matches the motherboard and case form factor (AT,ATX, BTX, etc.). Make sure that the power supply has the correct power connector for your processor. Most newer processors require an additional 4-pin connector in addition to the 20-pin connector. Some motherboards combine these combine these connectors into a single 24-pin connector. Select a power supply with sufficient watts to power all devices. The higher the watts, the more internal external devices that can be supported. Nearly all power supplies can accept both 110 and 220 volts AC input. Use switch on the back to specify the input power. All power supplies output +/-5 and +/-12 volts DC power.

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 doesn’t have an 8-pin. PCIe power connector. Which solution 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. Explanation Use an adapter cable to convert 4-pin Molex connectors to the connectors you require. You can typically purchase adapters for PCIe video, SATA power, or processor power cables. Purchasing a new power supply or video card would workout would be more expensive than using an adapter.

Which of the following components converts AC to DC?

Power supply Explanation A computer’s power supply converts alternating current (AC) from the wall outlet to direct current (DC) used by the computer’s internal components. A voltage regulator is an electronic device that supplies the appropriate voltage to a processor. It does not convert the power input from one form to another; it only ensures that the voltage remains at the appropriate level for the device. A surge protector protects a system from power spikes. A UPS (uninterruptable power supply) provides backup AC power using a reserve battery.

Which of the following voltages are provided by an ATX power supply.

5 12 3.3 Explanation An ATX power supply provides 3.3, 5, and 12 volts DC.

Your company relocated you to their United Kingdom office in London. You brought your personal computer with you and are in the process of setting it up. Your computer was previously configured to receive 110 V AC, but the electricity in London uses 230 v AC.

Toggle the voltage switch on the power supply to the different voltage. Explanation Most power supplies have the capacity to receive between 110 and 230 volt power just by toggling a switch (typically red) on the power supply casing. You can use this switch when using the power supply in other countries. 110 volts is used in the United States. 230 volts is used in Europe and the United Kingdom.

You have a motherboard that uses a 24-pin ATX connector.

Which types of power supply could you use with this motherboard?

A power supply with a 20-pin ATX and a +4-pin connector. A power supply with a 24-pin ATX connector only. Explanation In this case, the motherboard needs wither a 24-pin. When selecting a power supply, make sure it includes the necessary connectors for your motherboard. Specifically, some motherboards and processors require an extra 4-pin and/or 8-pin connector in addition to the main 20- or 24-pin power connector.

Which of the following functions does an ATX power supply perform?

Aids in thermal management. Converts AC to DC. Explanation Power supplies are responsible for powering every component in a computer system. Power supplies provide the following functions: Convert AV power to DC power. Provide internal components with 3.3 V, 5 V of DC power. Aid in thermal management. Surge protectors are used to protect power supplies and electronic components from power spikes. A UPS (uninterruptable power supplies) is used to provide backup power to a computer.

Which of the following devices use the 4-pin peripheral (Molex) connector?

Case fan PATA CD-ROM Explanation The 4-pin peripheral power connector (colloquially called a 4-pin Molex connector) is used by the following components: PATA CD-ROM IDE hard drives Case fans Solid state drives and SATA hard disk drives use SATA power connectors. If a CPU needs auxiliary power, it uses either a 4-pin 12 V (P4) connector or an 8-pin EPS12V CPU connector.

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?

Form factor Type and number of connectors Output wattage Explanation When choosing a power supply: Select the power supply form factor that matches the motherboard and case form factor (ATX, Micro-ATX, Mini-ITX, etc.). Male sure that the power supply has the correct type and number of power connectors for all of you devices. Select a power supply with sufficient watts to power all devices. The higher the watts, the more internal and external devices that can be supported. Nearly all power supplies can accept between 110 and 230 volts AC inout. Use the switch on the back to specify the input power. All power supplies output +/-5 and +/-12 volts DC power.

You are testing the power in a PC system by measuring the voltage available on the 4-pin Molex connector. The voltage on the red wire in +5.1 volts. What should you do?

Nothing, the power supply is working normally. Explanation The red wire on a Molex connector should provide +5 volts DC, so this power supply is functioning normally.

You have a desktop computer that uses a 250 watt power supply. You recently added a 4-disk RAID 10 array to the system and now it spontaneously shuts down. What should you do?

Upgrade to a power supply that provides more watts. Explanation The number of devices that can be supported by a power supply is directly related to the number of watts the power supply provides. In this situation, the new RAID array, along with all of the other components in the system, is drawing more watts than the power supply can provide. A watt is a rating of the amount of work that power supply can do. Volts is a measure of electrical pressure, and is not directly related to the number of devices it will support. The voltage is dependent on the voltage of the wall socket. The voltage switch on the power supply should match the voltage at the wall outlet. 110 is used in the United States, while 200 is typically used in Europe.

Which power supply feature helps prevent circuit overloads by balancing the current flow?

Dual rail Explanation Each separate voltage output circuit is referred to as a rail and can power multiple devices. To avoid overloading one circuit, many newer power supplies have two or more +12 volt rails. These are known as dual rail power supplies. Separate rails balance the power load between multiple circuits, preventing any one circuit from becoming overloaded. Cooling fans keep the power supply from over heating, but play no role in preventing circuit overloads. Some power supplies can automatically detect the voltage (115 which is used in North America or 230 which is used in Europe) so the switch is eliminated. Converting AC power (from the wall socket) to DC power (which then flows to the computer components) is simply the primary function of the power supply.

You are servicing a client’s computer that has been randomly restarting. You decide to test the power supply using a multimeter. You connect the positive lead to the yellow wire on one of the Molex connectors.

Which action should you take based on the multimeter reading. (shown in the diagram)?

The power supply is failing and should be replaced. Explanation The power supply in this scenario is failing. Any time the voltage on the yellow wire of a Molex connector drops below about 11 volts, the power supply should be replaced. Switching the power supply to use 230 volts AC will not fix the issue. Low voltage issues aren’t contained to a single connector, so even if you stop using that particular Molex connector, the system will still have problems.

An employee submitted a support ticket stating that her computer will not turn on.

Which of the following troubleshooting steps should you take first?

Make sure the power cord is plugged into the wall. Make sure the surge protector is turned on. Explanation When troubleshooting the power supply, always check the following before opening up the computer: Make sure the power cord is plugged into the wall. Verify any surge protectors are plugged in and in the on position. Make sure the power supply’s switch is in the on position. Only after you identify the power supply is the problem should you replace it. The keyboard and mouse being unplugged in will not prevent the computer from powering on. Testing the power supply using a multimeter should be done only after the obvious has been ruled out.

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