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CompTIA A+ > Power > Flashcards

Power Flashcards

1
Q

In DC power, electrons flow:

A

One way.

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2
Q

What should you do if you find an AC outlet is improperly wired?

A

Contact your supervisor and/or building management to resolve the problem.

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3
Q

What should you use to keep an AC outlet’s voltage steady?

A

A UPS or line conditioner.

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4
Q

What tool would you use to test the amount of voltage that comes from an AC outlet?

A. Multimeter
B. Voltage detector
C. Receptacle tester
D. Impedance tester

A

A. Multimeter

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5
Q

Which of the following is a representation of potential energy?

A. Wattage
B. Voltage
C. Impedance
D. Amperage

A

B. Voltage

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6
Q

Which wire when tested should display zero volts on a multimeter?

A. Neutral
B. Hot
C. Ground
D. Red

A

C. Ground

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7
Q

What is an unexpected increase in the amount of voltage provided?

A

Surge

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8
Q

What is a short transient and voltage that can be due to a short circuit, tripped circuit breaker, power outage, or lightning strike?

A

Spike

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9
Q

What is an unexpected decrease in the amount of voltage provided?

A

Sag

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10
Q

What is a total loss of power for a prolonged period?

A

Blackout

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11
Q

What is it called when the voltage drops to such an extent that it typically causes the lights to dim and causes computers to shut off?

A

Brownout

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12
Q

What is a group of sockets usually in line with a flexible cable that plugs into an AC outlet called?

A

Power strip

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13
Q

What is a power strip that also incorporates a metal-oxide varistor (MOV) to protect against surges and spikes?

A

Surge protector

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14
Q

What takes the functionality of the surge suppressor and combines that with the battery backup?

A

Uninterruptible power supply (UPS)

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15
Q

Don’t ever connect laser printers, surge protectors, or power strips to UPS devices.

A

It can cause the UPS to overload.

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16
Q

Which device should you use to protect against power outages?

A. Multimeter
B. UPS
C. FedEx
D. Surge protector

A

B. UPS

17
Q

You want a cost-effective solution to the common surges that can affect your computer. Which device would be the best solution

A. UPS
B. Surge protector
C. Power strip
D. Line conditioner

A

B. Surge Protector

18
Q

Which of these is an unexpected increase voltage?

A. Sag
B. Blackout
C. Spike
D. Whiteout

A

C. Spike

19
Q

You’re fixing a computer for a customer when you notice a few of the fluorescent lights flickering every now and then. What should you recommend to the customer to protect their equipment?

A. To get an electrician
B. To install a UPS.
C. To get an extra power supply.
D. To buy a generator.

A

B. To install a UPS

20
Q

Original ATX power supplies connect to motherboard with:

A

20 pin connector

21
Q

Newer ATX 12V 2.x power supplies connect with:

A

24 pin connector

22
Q

Never open a power supply!

A

If it has failed, replace it with a working unit.

23
Q

Which device test multiple wires of a power supply at the same time?

A. Multimeter
B. Power supply tester
C. Line conditioner
D. Surge protector

A

B. Power supply tester

24
Q

Which power connector would be used to power an IDE hard drive?

A. Molex
B. Mini
C. P1
D. P8/P9

A

A. Molex

25
Q

Which of the following uses a 24 pin main motherboard power connector?

A. ATX
B. ATX 12V 1.3
C. ATX 12V 2.0
D. ATX 5V 2.0

A

C. ATX 12V 2.0

26
Q

What voltages are supplied by a Molex power connector?

A. 12V and 5V
B. 5V and 3.3V
C. 3.3V and 1.5V
D. 24V and 12V

A

A. 12V and 5V

27
Q

The company sales person just returned to the United States after three months in Europe. Now the sales person tells you that the PC, which works fine in Europe, won’t turn on. What is the best solution?

A. Install a new power supply
B. The computer will not work in the United States due to European licensing.
C. Install a power inverter to the power supply.
D. Change the voltage from 230 to 115.

A

D. Change the voltage from 230 to 115.

28
Q

You’re troubleshooting a computer that won’t power on. You have already checked the AC outlet and the power cord, which appear to be functioning properly. What should you do next?

A. Test the computer with the PSU tester.
B. Plug the computer into a different outlet.
C. Check that the RAM is seated correctly.
D. Install a UPS.

A

A. Test the computer with a PSU tester.

29
Q

You suspect that incorrect voltage is provided to a power supply. What tool should you use to test this?

A. PSU tester
B. Loopback adapter
C. Multimeter
D. Voltage detector

A

C. Multimeter

30
Q

You just upgraded a motherboard in a computer, and put the system back together. It boots, but the power LED on the front of the computer case doesn’t light when the system is on. The rest of the computer seems to work fine. What should you do first?

A. Check the power supply.
B. Check the power LED pinout.
C. Replace the LED.
D. Replace the power button.

A

B. Check the power LED pinout.

31
Q

A computer you were troubleshooting shuts down without warning. After a few minutes it boots back up fine, but after running for short time, it shuts down again. What components could be the cause? (Select the two best answers.)

A. Power Supply
B. SATA hard drive
C. RAM
D. CPU fan
E. Video card
A

A and D.
Power supply and CPU fan.
The RAM, video card, and hard drive should not cause the system to suddenly shut down.

32
Q

In AC power, electrons flow:

A

Alternating.

CompTIA A+ (18 decks)

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