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Free download in PDF Data Communication Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
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)
42
_____ signals can have an infinite number of values in a range.
[A]
Analog
[B]
Digital
[C]
(a) or (b)
[D]
None of the above
43
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
44
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
45
_______ data have discrete states and take discrete values.
[A]
Analog
[B]
Digital
[C]
(a) or (b)
[D]
None of the above
46
A sine wave is ________.
[A]
periodic and discrete
[B]
aperiodic and discrete
[C]
periodic and continuous
[D]
aperiodic and continuous
Answer: periodic and continuous
47
Signals can be ________.
[A]
digital
[B]
analog
[C]
either (a) or (b)
[D]
neither (a) nor (b)
Answer: either (a) or (b)
48
________ 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
49
Data can be ________.
[A]
digital
[B]
analog
[C]
(a) or (b)
[D]
none of the above
50
Before data can be transmitted, they must be transformed to ________.
[A]
periodic signals
[B]
electromagnetic signals
[C]
aperiodic signals
[D]
low-frequency sine waves
Answer: electromagnetic signals
51
_______ signals can have only a limited number of values.
[A]
Digital
[B]
Analog
[C]
(a) or (b)
[D]
None of the above
52
The _________ product defines the number of bits that can fill the link.
[A]
delay-amplitude
[B]
frequency-amplitude
[C]
bandwidth-period
[D]
bandwidth-delay
53
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
Answer: single-frequency; composite
54
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
Answer: distance a signal or bit has traveled
55
Frequency and period are ______.
[A]
proportional to each other
[B]
inverse of each other
[C]
the same
[D]
none of the above
Answer: inverse of each other
56
_______ data are continuous and take continuous values.
[A]
digital
[B]
analog
[C]
(a) or (b)
[D]
none of the above
57
In a time-domain plot, the horizontal axis is a measure of ________.
[A]
phase
[B]
signal amplitude
[C]
frequency
[D]
time
58
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
59
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
60
________ 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
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