A+ Essentials Chapter 8

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A Plus Essential Quizzes & Trivia

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


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

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

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

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

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  • 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.

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  • 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.

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  • 7. 

    How many pins does a SATA power connector have?

    • A.

      6

    • B.

      9

    • C.

      12

    • D.

      15

    Correct Answer
    D. 15
    Explanation
    SATA power connectors have 15 pins.

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  • Mar 21, 2023
    Quiz Edited by
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  • Oct 24, 2008
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    Darren McMahon
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