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A simple way to convert parallel to serial data is to use _________.


A) a FIFO memory
B) a parallel in serial out shift register
C) a full- adder
D) a binary to hexadecimal converter

E) C) and D)
F) A) and C)

Correct Answer

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The most common type of coaxial connector is the_________.


A) banana jack
B) stereo phono jack
C) alligator clip
D) BNC connector

E) B) and D)
F) A) and B)

Correct Answer

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The simplest connection between a sending device and receiving device is_________.


A) a coaxial cable
B) a fiber optic cable
C) a wire
D) a shielded twisted pair

E) B) and C)
F) A) and C)

Correct Answer

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Bit- interleaved time division multiplexing uses a start and stop bit to synchronize the multiplexing and demultiplexing of transmitted data.

A) True
B) False

Correct Answer

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Optical fiber is used when a data transmission system requires a cheap transmission medium.

A) True
B) False

Correct Answer

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The ways in which radio frequency and microwave signals propagate through the atmosphere include all of the following except _________.


A) stratospheric
B) ground wave
C) line- of- sight
D) ionospheric

E) All of the above
F) B) and C)

Correct Answer

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For a return to zero data format _________.


A) a single pulse during a bit time represents a 0 and absence of a pulse represents a 1
B) a change during a bit time represents a 1 and no change represents a 0
C) a single pulse during a bit time represents a 1 and absence of a pulse represents a 0
D) the format is meaningless because there is no return to zero data format

E) A) and B)
F) B) and C)

Correct Answer

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ASK stands for asynchronous serial keying.

A) True
B) False

Correct Answer

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Digital data transmission channels can be all of the following except_________.


A) wireless
B) wire cable
C) optical fiber
D) thermal transmission

E) A) and B)
F) All of the above

Correct Answer

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A modulation method used to convert the amplitude of an analog signal to digital values is pulse amplitude modulation.

A) True
B) False

Correct Answer

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Most signal loss in coaxial cable or twisted pair media is because of resistance.

A) True
B) False

Correct Answer

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The fiber optic core for single- mode propagation is __________.


A) much smaller in diameter than in multimode propagation
B) about the same diameter as in multimode propagation
C) much larger in diameter than in multimode propagation
D) somewhat larger in diameter than in multimode propagation

E) A) and D)
F) A) and B)

Correct Answer

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Synchronous data formats include all of the following except_________.


A) duplex cycling
B) Manchester encoding
C) return to zero
D) non- return to zero

E) C) and D)
F) None of the above

Correct Answer

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The data efficiency of a system is the percentage of the total communications time spent transmitting data bits.

A) True
B) False

Correct Answer

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Communication in the infrared region can be _________.


A) multimode
B) dispersed
C) single- mode
D) diffused

E) B) and C)
F) None of the above

Correct Answer

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Optical fiber cables can support faster data rates than copper conductors.

A) True
B) False

Correct Answer

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Frequency shift keying is a type of encoding in which a digital signal modulates the frequency of a higher frequency sine wave is frequency shift keying.

A) True
B) False

Correct Answer

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Shielded twisted pair cable provides more protection from _________ than unshielded twisted pair cable.


A) SNR
B) STP
C) PSK
D) EMI

E) A) and C)
F) A) and B)

Correct Answer

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In pulse position modulation _________.


A) the position of a pulse relative to a reference signal varies based upon the value of the modulating signal
B) the position of a pulse relative to a reference signal varies based upon its amplitude relative to the amplitude of the modulating signal
C) the frequency of a pulse waveform varies based upon the position of the zero- crossing of the modulating signal relative to a reference signal
D) the amplitude of a pulse varies based upon its position relative to the zero- crossing of the modulating signal

E) A) and B)
F) A) and C)

Correct Answer

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