Electrical measurements — Learn

Digital Communications MCQs set-2

Review each question and reveal answers to strengthen your understanding

1 Find the 8-ary waveform for the word ‘HAPPY’.
✅ Correct Answer: 2
2 Find the 32-ary waveform for the word ‘HAPPY’.
✅ Correct Answer: 1
3 What are the characteristics of an ideal transmission line?
✅ Correct Answer: 4
4 The point at which the output signal power has fallen to 0.707 of its peak value is called as _____
✅ Correct Answer: 3
5 The ratio of the filter bandwidth at -60db and -6db amplitude response point is called as _____
✅ Correct Answer: 3
6 As the order of the filter increases, the cost ______ and complexity ______
✅ Correct Answer: 1
7 Which filter has maximum flatness?
✅ Correct Answer: 2
8 The measure of the width of the main lobe is called as ________
✅ Correct Answer: 1
9 SQNR can be improved by _______ sampling rate.
✅ Correct Answer: 1
10 Which offers better SQNR?
✅ Correct Answer: 2
11 Two functions are called as orthogonal if on integrating the product we get
✅ Correct Answer: 2
12 Eigen functions are not orthogonal.
✅ Correct Answer: 2
13 Shot noise is produced by
✅ Correct Answer: 3
14 Shot noise is avoidable when current is
✅ Correct Answer: 1
15 Which occurs due to equilibrium fluctuations?
✅ Correct Answer: 3
16 Flicker noise is called as
✅ Correct Answer: 2
17 Which has the same power spectral density?
✅ Correct Answer: 1
18 Which noise is useful for dithering?
✅ Correct Answer: 3
19 Capacity of a channel can be increased by
✅ Correct Answer: 3
20 Capacity of the channel can be increased by reducing in band noise power.
✅ Correct Answer: 1
21 Thermal noise is a wide sense stationary process.
✅ Correct Answer: 1
22 The maximum likelihood function is
✅ Correct Answer: 1
23 Matched filtering operation includes
✅ Correct Answer: 3
24 Matched filter is
✅ Correct Answer: 1
25 Which consists of less ISI?
✅ Correct Answer: 2
26 Digital communication is _______ to environmental changes?
✅ Correct Answer: 1
27 Advantages of digital communication are
✅ Correct Answer: 4
28 What is necessary for digital communication?
✅ Correct Answer: 4
29 What are the disadvantages of digital communication?
✅ Correct Answer: 3
30 Examples of digital communication are
✅ Correct Answer: 4
31 Which system uses digital transmission?
✅ Correct Answer: 3
32 The interval of frequencies outside which the spectrum is zero is called as ________
✅ Correct Answer: 3
33 The attenuation level in bounded power spectral density is
✅ Correct Answer: 3
34 Synchronization available in digital communication are
✅ Correct Answer: 4
35 Digital system includes
✅ Correct Answer: 1
36 Analog to digital conversion includes
✅ Correct Answer: 3
37 What are the main features of a receiver?
✅ Correct Answer: 3
38 What conditions must be fulfilled in a good digital communication system?
✅ Correct Answer: 4
39 Wired channels are
✅ Correct Answer: 1
40 The equivalent temperature in a receiver design must be kept
✅ Correct Answer: 1
41 Which corrects the sampling time problem in a digital system?
✅ Correct Answer: 1
42 What are the main features of a transmitter?
✅ Correct Answer: 4
43 Transmission media used in low frequency band are
✅ Correct Answer: 4
44 Transmission media used for medium frequency band are
✅ Correct Answer: 2
45 Matched filter technique is used to
✅ Correct Answer: 1
46 Matched filter can also be used as least squares estimator.
✅ Correct Answer: 1
47 Digital communication system can handle
✅ Correct Answer: 4
48 The information source of a digital communication system can be
✅ Correct Answer: 3
49 Which are the common transmission media used in digital communication system?
✅ Correct Answer: 4
50 The basic transmission-reception system is a ______ system.
✅ Correct Answer: 2
Back to All Quizzes