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Data Communications > Forouzan Chapter 3 MCQ > Flashcards

Forouzan Chapter 3 MCQ Flashcards

1
Q
  1. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.
    A) 2

B) 1

C) -2

D) between -2 and 2

A

C

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2
Q

_________ can impair a signal.

A) Noise

B) Attenuation

C) Distortion

D) All of the above

A

D

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3
Q

________is the rate of change with respect to time.

A) Time

B) Frequency

C) Amplitude

D) Voltage

A

B

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4
Q

A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.

A) P2 equals P1

B) P2 is zero

C) P2 is much larger than P1

D) P2 is much smaller than P1

A

A

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5
Q

Baseband transmission of a digital signal is possible only if we have a ____ channel.

A) bandpass

B) low-pass

C) high rate

D) low rate

A

B

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6
Q

________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.

A) Distortion

B) Attenuation

C) Noise

D) Decibel

A

B

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7
Q

A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

A) time; phase

B) frequency; time

C) time; frequency

D) phase; time

A

C

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8
Q

If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?

A) 5 KHz

B) 47 KHz

C) 57 KHz

D) 10 KHz

A

C

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9
Q

In a time-domain plot, the horizontal axis is a measure of ________.

A) phase

B) signal amplitude

C) frequency

D) time

A

D

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10
Q

_______ data are continuous and take continuous values.

A) digital

B) analog

C) (a) or (b)

D) none of the above

A

B

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11
Q

Frequency and period are ______.

A) proportional to each other

B) inverse of each other

C) the same

D) none of the above

A

B

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12
Q

When propagation speed is multiplied by propagation time, we get the ________.

A) wavelength of the signal

B) throughput

C) distance a signal or bit has traveled

D) distortion factor

A

C

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13
Q

A _________ sine wave is not useful in data communications; we need to send a _______ signal.

A) single-frequency; composite

B) composite; single-frequency This is the correct answer.

C) single-frequency; double-frequency

D) none of the above

A

A

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14
Q

The _________ product defines the number of bits that can fill the link.

A) delay-amplitude

B) frequency-amplitude

C) bandwidth-period

D) bandwidth-delay

A

D

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15
Q

_______ signals can have only a limited number of values.

A) Digital

B) Analog

C) (a) or (b)

D) None of the above

A

A

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16
Q

Before data can be transmitted, they must be transformed to ________.

A) periodic signals

B) electromagnetic signals

C) aperiodic signals

D) low-frequency sine waves

A

B

17
Q

Data can be ________.

A) digital

B) analog

C) (a) or (b)

D) none of the above

A

C

18
Q

________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.

A) Noise

B) Distortion

C) Attenuation

D) Decibel

A

B

19
Q

Signals can be ________.

A) digital

B) analog

C) either (a) or (b)

D) neither (a) nor (b)

A

C

20
Q

A sine wave is ________.

A) periodic and discrete

B) aperiodic and discrete

C) periodic and continuous

D) aperiodic and continuous

A

C

21
Q

_______ data have discrete states and take discrete values.

A) Analog

B) Digital

C) (a) or (b)

D) None of the above

A

B

22
Q

For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.

A) noiseless

B) noisy

C) low-pass

D) bandpass

A

B

23
Q

What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?

A) 1 KHz

B) 3 MHz

C) 4 MHz

D) none of the above

A

B

24
Q

_____ signals can have an infinite number of values in a range.

A) Analog

B) Digital

C) (a) or (b)

D) None of the above

A

A

25
Q

A(n)_________ signal is a composite analog signal with an infinite bandwidth.

A) digital

B) analog

C) either (a) or (b)

D) neither (a) nor (b)

A

A

26
Q

A periodic signal completes one cycle in 0.001 s. What is the frequency?

A) 1 Hz

B) 100 Hz

C) 1 KHz

D) 1 MHz

A

C

27
Q

The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.

A) period

B) bandwidth

C) frequency

D) amplitude

A

B

28
Q

. ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.

A) Noise

B) Distortion

C) Attenuation

D) Decibel

A

A

29
Q

_______ describes the position of the waveform relative to time 0.

A) Amplitude

B) Phase

C) Frequency

D) Voltage

A

B

30
Q

Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.

A) one-half

B) twice

C) the same as

D) indeterminate from

A

B

31
Q

As frequency increases, the period ________.

A) increases

B) decreases

C) doubles

D) remains the same

A

B

32
Q

If the available channel is a ______ channel, we cannot send a digital signal directly to the channel.

A) low-pass

B) low rate

C) bandpass

D) high rate

A

C

33
Q

For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.

A) low-pass

B) bandpass

C) noisy

D) noiseless

A

D

34
Q

. In a frequency-domain plot, the horizontal axis measures the ________.

A) phase

B) frequency

C) slope

D) peak amplitude

A

B

Data Communications (10 decks)

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