Power Supply

Question 1

What is the primary purpose of a power supply unit (PSU)?

Answer 1

To convert AC power from the outlet to DC power for computer components.

Question 2

What are common wattage ranges for desktop power supplies?

Answer 2

From 300W to 1200W, depending on the system’s requirements.

Question 3

What is the 80 PLUS certification for power supplies?

Answer 3

A certification indicating the efficiency of the PSU (e.g., Bronze, Silver, Gold).

Question 4

What is the purpose of a modular power supply?

Answer 4

Allows you to connect only the cables you need for better cable management.

Question 5

What is the difference between modular, semi-modular, and non-modular PSUs?

Answer 5

Modular allows all cables to be disconnected; semi-modular has some fixed cables; non-modular has all fixed cables.

Question 6

What is the purpose of the 24-pin ATX connector?

Answer 6

To provide power to the motherboard.

Question 7

What is the function of the 4/8-pin CPU power connector?

Answer 7

To supply additional power to the CPU.

Question 8

What is the purpose of PCIe power connectors?

Answer 8

To provide power to high-performance GPUs.

Question 9

What is the purpose of SATA power connectors?

Answer 9

To supply power to storage devices like HDDs and SSDs.

Question 10

What is the function of Molex connectors?

Answer 10

To provide power to older devices like optical drives and fans.

Question 11

What is the role of a PSU fan?

Answer 11

To dissipate heat generated by the power supply.

Question 12

What is Active PFC (Power Factor Correction) in a PSU?

Answer 12

Improves power efficiency and reduces wasted energy.

Question 13

What is a dual-rail power supply?

Answer 13

A PSU with multiple 12V rails to distribute power more evenly.

Question 14

What is the benefit of using a higher-wattage PSU than required?

Answer 14

Provides headroom for future upgrades and ensures stable operation.

Question 15

What is the purpose of over-voltage and under-voltage protection in a PSU?

Answer 15

To protect components from voltage spikes or drops.

Question 16

What should you check before replacing a power supply?

Answer 16

Ensure compatibility with the case, connectors, and wattage requirements.

Question 17

What is the importance of matching PSU wattage to system requirements?

Answer 17

To ensure all components receive adequate power without overloading the PSU.

Question 18

What should you do before installing or replacing a PSU?

Answer 18

Power off and unplug the system to avoid electrical shock.

Question 19

What tool is commonly used to secure a PSU in the case?

Answer 19

A screwdriver.

Question 20

What is a common issue when installing a PSU?

Answer 20

Cables not reaching components due to poor cable management or PSU location.

Question 21

What is a common symptom of an underpowered PSU?

Answer 21

System instability, unexpected shutdowns, or failure to power on.

Question 22

What is the purpose of a multimeter when troubleshooting a PSU?

Answer 22

To measure voltage output and ensure the PSU is functioning correctly.

Question 23

What is a common cause of PSU overheating?

Answer 23

Dust buildup or obstructed airflow.

Question 24

What should you do if a PSU is making unusual noises?

Answer 24

Inspect for a failing fan or electrical issues and consider replacing the PSU.

Question 25

What is the significance of a PSU’s efficiency rating?

Answer 25

Higher efficiency means less power is wasted as heat, reducing energy costs.