Electrical measurements — Quiz

Digital Communications MCQs set-3

50 questions · Test your knowledge

1 Modulation channel consists of
2 Modulation channel does not accept an analog input signal.
3 If operating frequency bands are higher ______ is available.
4 Ground wave communication occurs in
5 Sampling theorem is used for converting
6 A signal can be recovered from its sample by using
7 Which is practically realizable?
8 In flat top sampling scheme, ______ is kept constant after sampling.
9 Loop filter is a ______ used to reduce noise.
10 A stationary stochastic process has
11 The power spectral density function of the stochastic process is
12 For a periodic function, the spectral density and auto correlation functions form
13 The capacity of a channel is given by
14 In a communication system, a process in which statistical averages and time averages are equal is called as
15 A rectangular pulse of duration T is applied to a matched filter. The output of the filter is a
16 The line code has a zero dc component for pulse transmission of random binary data is
17 The auto-correlation of white noise is
18 Ionospheric communication can take place in
19 Satellite communication takes place in
20 The weighing matrix is
21 Non uniform tree _____ bit rate.
22 Two clock with rates T1 and T2 are incommensurate if its ratio is
23 Possible timing error detection methods are
24 Which has minimum power loss during transmission?
25 Voltage generated by lightning is an example for
26 In the digital communication system, signals in different frequency bands are
27 Properties of impulse function are
28 Properties of Fourier transform are
29 A base-band signal can be up-converted using
30 A band-pass signal can be down-converted using
31 In down-conversion multiplication with cosine wave is followed by
32 ADSL has _____ information channels.
33 Fourier transform of a signal gives the
34 Random things in a communication system are
35 Which can be used for periodic and non periodic?
36 A band-pass signal has a Fourier transform equal to
37 Which are orthonormal signal representation?
38 Constellation diagram is plotted in
39 Cumulative distributive function is
40 Which are non negative functions?
41 The sampling process includes methods such as
42 The output of sampling process are called as ________
43 According to Sampling theorem
44 The fourier tranform of one impulse train is also another impulse train with a period of the output equal to the
45 The process in which the top of each pulse in the output samples retains the shape of the analog segment is called as ________
46 The effects of aliasing are ________
47 Aliasing can be removed using
48 Which process is more economical?
49 Flat top sampling or practical sampling has
50 Multiplication of input signal with pulse train is done in ________ sampling.
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