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Tech Support Concepts > Chapter 17 > Flashcards

Chapter 17 Flashcards

1
Q

PowerOut/Power In is the formula that defines the __________ specification of a power supply.

A

Efficiency

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2
Q

What is the name of the device that can convert one of the standard voltages to a lower voltage required by the processor?

A

VRM

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3
Q

The ___________ is the part that the author says he has replaced more than any other part

A

Power Supply

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4
Q

What is the test equipment that can be used to test the effects of a brownout on a computer?

A

Variable Voltage Transformer

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5
Q

If the system is locked up or corrupted it can remain running when you press the power switch to turn it off; In that case, it is possible to use the same power switch to override the normal OS “soft power” off and force the computer to shut down by pressing and holding it for 2 seconds

A

False

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6
Q

You can use an adapter to convert a standard peripheral power connector to a SATA power connector?

A

True

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7
Q

What caution does the author give concerning AT/LPX power supply wires.

A

Two wires outside the power supply case are at lethal voltages

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8
Q

It is possible to plug the connectors from an AT power supply into the motherboard connector incorrectly if don’t properly line up the male and female connectors and plug them in so that the pins are offset between the two.

A

true

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9
Q

The auxiliary power connector is not included on power supplies sold today.

A

True

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10
Q

What is the biggest cause of component failure in computer systems?

A

Thermal expansion and contraction

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11
Q

A forgotten BIOS password can be reset by ____________

A

Removing the NVRAM battery

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12
Q

An adapter is required to connect a 24-pin connector from a power supply to a 20-pin connector on a motherboard.

A

False

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13
Q

Power supplies with no power factor correction generally use (for work) all of the power they receive from the power company.

A

False

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14
Q

Which of the following is a characteristic of the switching power supplies?

A

small size

inexpensive

generate little heat

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15
Q

What is the name of the power supply specification that indicates the amount of time a power supply can maintain its output voltages after the input voltage is lost?

A

Hold-up time

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16
Q

Which of the power supply form factors was developed to provide a standard for entry-level servers? This form factor has also introduced features that have later been included in the ATX power supply form factor.

A

EPS/EPS12v

17
Q

What certification does the author recommend that all electrical equipment (including computers) carry in the USA?

A

UL

18
Q

What way is best to connect a power supply for testing?

A

It should be installed in a working computer system

19
Q

What new bus introduced in 2004 required that the main power connector size be increased to 24 pins to supply adequate power for the bus?

A

PCI Express

20
Q

The author recommends using a three-pong to two-prong adapter for connecting computer equipment to two-prong power receptacles.

A

False

21
Q

What is the name of the connector on ATX power supplies that increases the power handling capabilities of pins in the connector?

A

HCS

22
Q

How can most high quality power supplies be reset?

A

Flipping off the power switch, then switching it back on

23
Q

What shape is the waveform that is output from a good-quality UPS?

A

True sine wave

24
Q

Name the ways in which a linear power supply is inefficient

A

Output voltage follows the input voltage making input variations affect the output

Heavy gauge wiring is required

Filtering out the 60 Hz frequency input voltage requires large and expensive filter capacitors and rectifiers

25
Q

______________________ is the word used to describe any power supply that does not conform to one of the standard power supply form factors

A

proprietary

26
Q

The formula Power Used(used by the computer)/Power Supplied(by the power company) defines the __________ specification for power supplies.

A

Efficiency (958)

27
Q

Which of the following is an option for powering up a computer by using ATX soft power capabilities

A

Pressing a keyboard key

Configuring a network card for wake on LAN

Setting a wakeup time

28
Q

Where is the RTC/NVRAM circuit located on most modern motherboards?

A

In the south bridge (I/O controller hub)

29
Q

If a power supply provides 300 watts of power to the computer, but receives 350 watts from the power company, what value is this specification for that power supply?( enter the percentage number and round up or down to eliminate the decimal)

A

86

30
Q

What voltage does a SATA power connector supply that a peripheral power connector does not supply?(use exact voltage but do not use a + or - sign)

A

3.3

31
Q

Select from the list below the power supply form factor developed to power entry-level servers.

A

EPS/EPS12v

32
Q

Select the ways that power supplies in computers have historically been overloaded from the list below.

A

Filling up expansion slots

Using high-powered processors

Adding drives

33
Q

What can be said about a computer as its operating temperature goes higher?

A

Its output capability goes down(?)(973)

Tech Support Concepts (14 decks)

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