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Digital Communications MCQs set-1

Review each question and reveal answers to strengthen your understanding

1 Which circuit is called as regenerative repeaters?
✅ Correct Answer: 2
2 What are the advantages of digital circuits?
✅ Correct Answer: 4
3 How many bytes does a gigabyte have?
✅ Correct Answer: 3
4 What is the ASCII value of space?
✅ Correct Answer: 1
5 Which block or device does the data compression?
✅ Correct Answer: 2
6 What is the code rate?
✅ Correct Answer: 1
7 Pulse shaping is done by which block or system?
✅ Correct Answer: 3
8 Equalizer is used for?
✅ Correct Answer: 3
9 Source coding block is used for?
✅ Correct Answer: 4
10 Which measurement considers phase as an important parameter?
✅ Correct Answer: 1
11 What is the period of a signal x(t)?
✅ Correct Answer: 1
12 Which of the given signals are periodic?
✅ Correct Answer: 1
13 Check whether the signal is periodic or not? x(t) = cos(4t) + 2sin(8t)
✅ Correct Answer: 1
14 Find the periodicity of the following signal. x(t)=cos((2Ï€/7)t)sin((3Ï€/5)t)
✅ Correct Answer: 3
15 Find the fundamental period of 1+sin^2 (3Ï€/5)n.
✅ Correct Answer: 2
16 Which signal is called as energy signal?
✅ Correct Answer: 1
17 Which signal is said to be power signal?
✅ Correct Answer: 3
18 Continuous Impulse signal is a power or energy signal?
✅ Correct Answer: 4
19 Discrete impulse signal is a power or energy signal?
✅ Correct Answer: 2
20 A unit impulse function has?
✅ Correct Answer: 4
21 Power spectral density function is a?
✅ Correct Answer: 4
22 Energy spectral density defines
✅ Correct Answer: 2
23 Power spectrum describes distribution of _________ under frequency domain.
✅ Correct Answer: 2
24 How can power spectral density of non periodic signal be calculated?
✅ Correct Answer: 2
25 What is Wiener-Khinchin theorem?
✅ Correct Answer: 2
26 According to Parseval’s theorem the energy spectral density curve is equal to?
✅ Correct Answer: 2
27 Spectogram is the graph plotted against?
✅ Correct Answer: 2
28 Autocorrelation is a function which matches
✅ Correct Answer: 3
29 Autocorrelation is a function of
✅ Correct Answer: 3
30 Autocorrelation is maximum at _______
✅ Correct Answer: 2
31 Autocorrelation function of periodic signal is equal to _______
✅ Correct Answer: 2
32 Autocorrelation is a _______ function.
✅ Correct Answer: 1
33 Autocorrelation function of white noise will have?
✅ Correct Answer: 1
34 Random variables give relationship between _____
✅ Correct Answer: 3
35 The distribution function of random variable is
✅ Correct Answer: 1
36 The distribution function of -(infinity) and (infinity) is _____
✅ Correct Answer: 1
37 The value of the probability density function of random variable is
✅ Correct Answer: 1
38 Which gives the measure of randomness of the random variable?
✅ Correct Answer: 2
39 Random process is a function of ______
✅ Correct Answer: 1
40 A random process is called as stationary in strict sense if
✅ Correct Answer: 1
41 For a stationary process, autocorrelation function depends on
✅ Correct Answer: 2
42 The autocorrelation function is maximum at
✅ Correct Answer: 1
43 White noise has _____ mean and ______ variance.
✅ Correct Answer: 3
44 The process of data conversion along with formatting the data is called as ______
✅ Correct Answer: 3
45 Formatting is the process which includes
✅ Correct Answer: 4
46 Analog information is converted to digital data using
✅ Correct Answer: 4
47 The process that transforms text into binary digits is called as _______
✅ Correct Answer: 3
48 For the number of bits, k=1 and number of symbols, M=2 the system is called as
✅ Correct Answer: 2
49 Perform the bit stream partitioning and find the 8-ary waveform for the word ‘THINK’.
✅ Correct Answer: 1
50 Find the 32-ary waveform for the word ‘THINK’.
✅ Correct Answer: 1
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