Fourozan (4th Edition)--Chapter 3

________is the rate of change with respect to time. A) Amplitude B) Time C) Frequency D) Voltage

c

A sine wave in the ______ domain can be represented by one single spike in the _____ domain. A) time; frequency B) frequency; time C) time; phase D) phase; time

a

A sine wave is ________. A) periodic and continuous B) aperiodic and continuous C) periodic and discrete D) aperiodic and discrete

a

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

As frequency increases, the period ________. A) decreases B) increases C) remains the same D) doubles

a

Baseband transmission of a digital signal is possible only if we have a ____ channel. A) low-pass B) bandpass C) low rate D) high rate

a

For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate. A) noisy B) noiseless C) bandpass D) low-pass

a

Frequency and period are ______. A) inverse of each other B) proportional to each other C) the same D) none of the above

a

_____ 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

_______ data are continuous and take continuous values. A) analog B) digital C) (a) or (b) D) none of the above

a

________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. A) Attenuation B) Distortion C) Noise D) Decibel

a

A _________ sine wave is not useful in data communications; we need to send a _______ signal. A) composite; single-frequency B) single-frequency; composite C) single-frequency; double-frequency D) none of the above

b

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 is zero B) P2 equals P1 C) P2 is much larger than P1 D) P2 is much smaller than P1

b

Before data can be transmitted, they must be transformed to ________. A) periodic signals B) electromagnetic signals C) aperiodic signals D) low-frequency sine waves

b

For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate. A) noisy B) noiseless C) bandpass D) low-pass

b

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

b

If the available channel is a ____ channel, we cannot send a digital signal directly to the channel. A) low-pass B) bandpass C) low rate D) high rate

b

In a frequency-domain plot, the horizontal axis measures the ________. A) peak amplitude B) frequency C) phase D) slope

b

______ describes the position of the waveform relative to time 0. A) Frequency B) Phase C) Amplitude D) Voltage

b

_______ data have discrete states and take discrete values. A) Analog B) Digital C) (a) or (b) D) None of the above

b

_______ 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) Attenuation B) Distortion C) Noise D) Decibel

b

_______ signals can have only a limited number of values. A) Analog B) Digital C) (a) or (b) D) None of the above

b

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

c

Data can be ________. A) analog B) digital C) (a) or (b) D) none of the above

c

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

c

Signals can be ________. A) analog B) digital C) either (a) or (b) D) neither (a) nor (b)

c

The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal. A) frequency B) period C) bandwidth D) amplitude

c

The _________ product defines the number of bits that can fill the link. A) bandwidth-period B) frequency-amplitude C) bandwidth-delay D) delay-amplitude

c

What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz? A) 4 MHz B) 1 KHz C) 3 MHz D) none of the above

c

________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. A) Attenuation B) Distortion C) Noise D) Decibel

c

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) 10 KHz C) 47 KHz D) 57 KHz

d

In a time-domain plot, the horizontal axis is a measure of ________. A) signal amplitude B) frequency C) phase D) time

d

When propagation speed is multiplied by propagation time, we get the ________. A) throughput B) wavelength of the signal C) distortion factor D) distance a signal or bit has traveled

d

_________ can impair a signal. A) Attenuation B) Distortion C) Noise D) All of the above

d