# United States Air Force 3A051 -volume 4 Exam Practice Test

84 Questions | Total Attempts: 34  Settings  3A051 Volume 4 multiple choice.

• 1.
How many volts of static electricity does it take to destroy a computer chip?
• A.

Less than 50.

• B.

100

• C.

150

• D.

More than 200.

• 2.
What do we call the emitted gas from new computer equipment or computers that are exposed to ultraviolet light and sunlight?
• A.

Burn-out.

• B.

Out-gassing.

• C.

Excess nitrogen.

• D.

Synthetic gassing.

• 3.
To prevent head aches caused by the almost invisible flicker of the monitor as the image on the screen is refreshed, you should increase the refresh rate of the monitor to at:
• A.

60 hertz.

• B.

65 hertz.

• C.

70 hertz.

• D.

75 hertz.

• 4.
At what minimum decibel (dB) level shall signs be placed notifying occupants they have entered a "hazardous noise area?"
• A.

65.

• B.

85.

• C.

105.

• D.

125.

• 5.
In which electrostatic discharge (ESD) class would sensitive items be when the voltage ranges from 1,000 to 3,999?
• A.

I.

• B.

II.

• C.

III.

• D.

IV.

• 6.
What numbering system term indicates the number of digits used ina particular numbering system?
• A.

• B.

Digit.

• C.

Exponent.

• D.

Fractional Point.

• 7.
What numbering system term indicates how many times a number is to be multiplied by itself?
• A.

• B.

Digit.

• C.

Exponent.

• D.

Decimal Point.

• 8.
To change a decimal to metric prefix format, you must first convert the number to a value multiplied by the base:
• A.

10 multiplier associated with the prefix you want to use.

• B.

2 multiplier associated with the prefix you want to use.

• C.

5 multiplier associated with the prefix you want to use.

• D.

8 multiplier associated with the prefix you want to use.

• 9.
How many symbols does the binary numbering system use?
• A.

Two.

• B.

Three.

• C.

Four.

• D.

Five.

• 10.
What is used as placeholders in the binary numbering system?
• A.

Zeros.

• B.

Ones.

• C.

Twos.

• D.

Threes.

• 11.
What decimal number is represented by 1111011.2 in the binary numbering system?
• A.

65.10

• B.

73.10

• C.

123.10

• D.

150.10

• 12.
What does the power in the binary system do as the exponent increases by one?
• A.

Increases by one.

• B.

Increases by two.

• C.

Doubles its value.

• D.

Triples its value.

• 13.
When developing a place value chart, what is the power of the exponent at the far right of the chart's base or radix line?
• A.

0

• B.

1

• C.

2

• D.

3

• 14.
What is the most common mistake people make when adding binary numbers?
• A.

• B.

Forgetting to make the carries.

• C.

Starting at the most significatn digit (MSD) instead of the least significant digit (LSD).

• D.

Starting at the LSD instead of the MSD.

• 15.
When doing binary subtraction, you borrow when subtracting
• A.

0-0

• B.

0-1

• C.

1-0

• D.

1-1

• 16.
Compared to the binary system, how many numbers dows the hexadecimal numbering system take to represent a number?
• A.

One-fifth of the numbers.

• B.

One-half of the numbers.

• C.

One-third of the numbers.

• D.

One-fourth of the numbers.

• 17.
What are the decimal postitions 10 through 15 represented by in the hexadecimal numbering system?
• A.

Alphanumberic characters.

• B.

• C.

Alphabetic characters A through F.

• D.

Alphabetic characters G through L.

• 18.
What is the last step in the hexadecimal-to-decimal conversion?
• A.

Write the new octal number with a radix of 8.

• B.

Convert the decimal number to a series of powers of ten expressions.

• C.

Convert the hexadecimal number to a seires of powers of eight expressions.

• D.

Decimally add the results and write the number witha base ten subscript.

• 19.
• A.

By the multiply and carry technique.

• B.

By multiplying the decimal sum by 16.

• C.

By dividing the hexadecimal number successively by the base of the decimal system.

• D.

By dividing the decimal number successively by the base of the hexadecimal system.

• 20.
What is the last step in binary-to-hexadecimal conversion?
• A.

• B.

• C.

Convert the hexadecimal number to a series of powers of 8 expressions.

• D.

Decimally add the results and write the new number with a base 10 subscript.

• 21.
How many steps are there in hexadecimal subtraction?
• A.

3.

• B.

4.

• C.

5.

• D.

6.

• 22.
What is a set of rules that define how network communications are to take place?
• A.

Protocols.

• B.

Standards.

• C.

Application.

• D.

Specification.

• 23.
In which layer of the Open Systems Interconnect (OSI) Model does the checksum and the cyclic redundancy checksum (CRC) reside?
• A.

Session.

• B.

Network.

• C.

Transport.

• D.

• 24.
Which layer of the Open Systems Interconnect (OSI) Model is responsible for reliable end-to-end, also caleld host-to-host, packet delivery?
• A.

Session.

• B.

Network.

• C.

Transport.

• D.

• 25.
How many layers are there in the Transmission Control Protocol/Internet Protocol (TCP/IP) suite and the Open Systems Interconnect (OSI) Model?
• A.

Three and five, respectively.

• B.

Four and six, respectively.

• C.

Five and seven, respectively.

• D.

Six and eight, respectively.

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