1.
_______ data have discrete states and take discrete values.
A)
Analog
B)
Digital
C)
(a) or (b)
D)
None of the above
2.
Signals can be ________.
A)
analog
B)
digital
C)
either (a) or (b)
D)
neither (a) nor (b)
3.
_____ signals can have an infinite number of values in a range.
A)
Analog
B)
Digital
C)
(a) or (b)
D)
None of the above
4.
_______ signals can have only a limited number of values.
A)
Analog
B)
Digital
C)
(a) or (b)
D)
None of the above
5.
Frequency and period are ______.
A)
inverse of each other
B)
proportional to each other
C)
the same
D)
none of the above
6.
________is the rate of change with respect to time.
A) Amplitude
B)
Time
C)
Frequency
D)
Voltage
7.
_______ describes the position of the waveform relative to time 0.
A)
Frequency
B)
Phase
C)
Amplitude
D)
Voltage
8.
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
9.
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
10.
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
11.
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)
12.
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
13.
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
14.
For a ______ channel, the Nyquist bit rate formula defines the theoretical
maximum bit rate.
A)
noisy
B)
noiseless
C)
bandpass
D)
low-pass
15.
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
16.
_________ can impair a signal.
A)
Attenuation
B)
Distortion
C)
Noise
D)
All of the above
17.
The _________ product defines the number of bits that can fill the link.
A)
bandwidth-period
B)
frequency-amplitude
C)
bandwidth-delay
D)
delay-amplitude
ANSWERS:
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
|
13
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14
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15
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16
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17
|
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B
|
C
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A
|
B
|
A
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C
|
B
|
A
|
B
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C
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A
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A
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B
|
B
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A
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D
|
C
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GATE ELECTRONICS AND COMMUNICATION,(117) SIGNALS AND SYSTEMS QUESTIONS & ANSWERS
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Signals and Systems
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