A+ Essentials Chapter 8

1. When testing an AC outlet in the U.S., what voltage should the multimeter
show between the hot and ground wires?

120 V

60 V

0 V

–120 V

The multimeter should show 120 V (or thereabouts) between the hot and
ground of a properly wired outlet.

Explanation

The multimeter should show 120 V (or thereabouts) between the hot and
ground of a properly wired outlet.

About This Quiz

Power Supplies

In this chapter, you will learn how to

• Explain the basics of electricity
• Describe the details about powering the PC
• Install, maintain, and troubleshoot power supplies

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2. Why is it a good idea to ensure that the slot covers on your computer case are
all covered?

To maintain good airflow inside your case.

It helps keep dust and smoke out of your case.

Both A and B are correct reasons.

Trick question! Leaving a slot uncovered doesn’t hurt anything.

Both A and B are correct reasons—keeping the slots covered helps keep a
good airflow in your case, and it keeps dust and smoke away from all those
sensitive internal components.

Explanation

Both A and B are correct reasons—keeping the slots covered helps keep a
good airflow in your case, and it keeps dust and smoke away from all those
sensitive internal components.

3. What voltages does an ATX12V P1 connector provide for the motherboard?

3.3 V, 5 V

3.3 V, 12 V

5 V, 12 V

3.3 V, 5 V, 12 V

An ATX12V power supply P1 connector provides 3.3, 5, and 12 volts to the
motherboard.

Explanation

An ATX12V power supply P1 connector provides 3.3, 5, and 12 volts to the
motherboard.

4. Joachim ordered a new power supply but was surprised when it arrived
because it had an extra, 4-wire connector. What is that connector?

P2 connector for plugging in auxiliary components

P3 connector for plugging in case fans

P4 connector for plugging into Pentium 4 and later motherboards

Aux connector for plugging into a secondary power supply

The P4 connector goes into the motherboard to support faster
processors.

Explanation

The P4 connector goes into the motherboard to support faster
processors.

5. What voltages should the two hot wires on a Molex connector read?

Red = 3.3 V; Yellow = 5 V

Red = 5 V; Yellow = 12 V

Red = 12 V; Yellow = 5 V

Red = 5 V; Yellow = 3.3 V

A Molex connector’s red wires should be at 5 volts; the yellow wire should
be at 12 volts.

Explanation

A Molex connector’s red wires should be at 5 volts; the yellow wire should
be at 12 volts.

6. How many pins does a SATA power connector have?

SATA power connectors have 15 pins.

Explanation

SATA power connectors have 15 pins.

7. A PC’s power supply provides DC power in what standard configuration?

Two primary voltage rails, 12 volts and 5 volts, and an auxiliary 3.3 voltconnector.

Three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-voltconnectors.

One primary DC voltage rail for 12-volt, 5-volt, and 3.3-volt connectors.

The standard PC power supply configuration has three primary voltage
rails, one each for 12-volt, 5-volt, and 3.3-volt connectors.

Explanation

The standard PC power supply configuration has three primary voltage
rails, one each for 12-volt, 5-volt, and 3.3-volt connectors.

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Oct 24, 2008

Quiz Created by
Darren McMahon