A+ Essentials Chapter 8
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
- 1.
When testing an AC outlet in the U.S., what voltage should the multimetershow between the hot and ground wires?
- A.
120 V
- B.
60 V
- C.
0 V
- D.
–120 V
Correct Answer
A. 120 VExplanation
The multimeter should show 120 V (or thereabouts) between the hot and
ground of a properly wired outlet.Rate this question:
-
- 2.
What voltages does an ATX12V P1 connector provide for the motherboard?
- A.
3.3 V, 5 V
- B.
3.3 V, 12 V
- C.
5 V, 12 V
- D.
3.3 V, 5 V, 12 V
Correct Answer
D. 3.3 V, 5 V, 12 VExplanation
An ATX12V power supply P1 connector provides 3.3, 5, and 12 volts to the
motherboard.Rate this question:
-
- 3.
Joachim ordered a new power supply but was surprised when it arrivedbecause it had an extra, 4-wire connector. What is that connector?
- A.
P2 connector for plugging in auxiliary components
- B.
P3 connector for plugging in case fans
- C.
P4 connector for plugging into Pentium 4 and later motherboards
- D.
Aux connector for plugging into a secondary power supply
Correct Answer
C. P4 connector for plugging into Pentium 4 and later motherboardsExplanation
The P4 connector goes into the motherboard to support faster
processors.Rate this question:
-
- 4.
What voltages should the two hot wires on a Molex connector read?
- A.
Red = 3.3 V; Yellow = 5 V
- B.
Red = 5 V; Yellow = 12 V
- C.
Red = 12 V; Yellow = 5 V
- D.
Red = 5 V; Yellow = 3.3 V
Correct Answer
B. Red = 5 V; Yellow = 12 VExplanation
A Molex connector’s red wires should be at 5 volts; the yellow wire should
be at 12 volts.Rate this question:
-
- 5.
Why is it a good idea to ensure that the slot covers on your computer case areall covered?
- A.
To maintain good airflow inside your case.
- B.
It helps keep dust and smoke out of your case.
- C.
Both A and B are correct reasons.
- D.
Trick question! Leaving a slot uncovered doesn’t hurt anything.
Correct Answer
C. Both A and B are correct reasons.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.Rate this question:
-
- 6.
A PC’s power supply provides DC power in what standard configuration?
- A.
Two primary voltage rails, 12 volts and 5 volts, and an auxiliary 3.3 volt connector.
- B.
Three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-volt connectors.
- C.
One primary DC voltage rail for 12-volt, 5-volt, and 3.3-volt connectors.
- D.
One voltage rail with a 12-volt connector for the motherboard, a second voltage rail with a 12-volt connector for the CPU, and a third voltage rail for the 5-volt and 3.3-volt connectors.
Correct Answer
B. 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.Rate this question:
-
- 7.
How many pins does a SATA power connector have?
- A.
6
- B.
9
- C.
12
- D.
15
Correct Answer
D. 15Explanation
SATA power connectors have 15 pins.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Oct 24, 2008Quiz Created by
Darren McMahon
Back to top