This article lists 50+ Digital Communication MCQs for engineering students. All the Digital Communication Questions & Answers given below include a solution and link wherever possible to the relevant topic.
Digital communication is the communication in which any message signal passed through digital devices. It is a communication system in which any type of information is sent digitally. Some examples of digital communication are Emailing on the computer, texting on a cell phone, fax, teleconferencing, video conferencing, etc. We require digital communication for internet/4G, and the processors also work on digital data.
The digital communication systems are simpler and cheaper due to the advancements of IC technologies, the IC’s are reliable, cost-effective, and small in size.
It is possible to use multiplexers in digital communication to merge speech, video, and other forms of data for transmission over a common channel.
1). The rearrangement of the data sequence is called _____
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2). The modulation techniques are categorized into _________
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Read more about Modulation
3). In amplitude shift keying the 1 and 0 is denoted by _______
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4). The probability of error of amplitude shift keying is given by _______
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Read more about Amplitude Shift Keying
5). The line encoding is classified into ______________
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6). The line encoding converts ________
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7). In unipolar line encoding 1 and 0 is represented as ________
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8). The properties of line encoding are _______
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9). Why scrambling is required?
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10). How many categories does the equalizer have?
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11). In bipolar line encoding 1 and 0 is represented as ________
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Read more about Encoders
12). The change in amplitude of carrier in accordance to the digital message signal then it is called as _________
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13). The bit change corresponds to 450 phase change in _________
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14). __________ is the non coherent mode of binary phase shift keying
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15). The maximum rate of information from transmitter to receiver is known as ___________
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16). In polar line encoding 1 and 0 is represented as ________
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17). The frequency of carrier signal is modified in accordance to the message signal then it is called as __________
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18). Which one comes under block code?
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19). Which code doesn’t have memory?
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20). Which code does have memory elements?
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Digital Communication Important MCQ’s for Students
21). When the phase of the carrier signal is varied in accordance to the message signal then it is called as _________
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22). The code efficiency in block code is denoted by ________
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23). The total number of non zero bits in code is known as _________
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24). The number of one’s in output code is even in ______
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25). ________ parity check detects only one error
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26). Which one is the type of generation of cyclic code?
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27). In which type of cyclic code generation the position of parity bits are not defined?
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28). In which type of cyclic code generation the position of parity bits are well defined?
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29). _______ is the number of shifts over which single message bit influences the encoder output
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30). _______ is a well defined, finite valued, real function on sample space
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31). __________ parity check detects and corrects one error
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32). The number of one’s in output code is odd in _______
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33). ________ is the collection of all possible outcomes of a random experiment
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34). If each element in set A is mapped to separate element or a unique element in set B then it is called ___________
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35). If each element in set A is mapped to elements in set B and we don’t have an extra element in set B then it is called ___________
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36). The random variable takes continous value in an interval then it is called _________
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37). If there is a finite random variables in set A which are mapped to finite elements in set B then it is called as ______
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38). If first N elements of subset matched to the first N natural numbers then it is called as _________
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39). The poisson distribution function is discovered by ________
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40). The Bernoulli distribution is discovered by _____
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Digital Communication Important MCQ’s for Interviews
41). ________ is used greatly in diverse fields, in central limit theorm, and sampling theorm
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42). The orthogonal frequency division multiplexing used in _________
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43). The data rate transmission of orthogonal frequency division multiplexing is __________
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44). The data rate transmission of frequency division multiplexing is __________
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45). The voltage waveform which varies with time in an entirely unpredictable manner then it is called _________
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46). The contaminated signal gives __________
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47). What are the advantages of digital communication systems?
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48). What are the disadvantages of digital communication systems?
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49). In digital spread spectrum the input signal is modulated by ________
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50). In Frequency Hoping Spread Spectrum (FHSS), which is the effective method for coherent detection?
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51). The chip generator in digital spread spectrum is used to ____________
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52). What is fast hoping in frequency hoping spread spectrum?
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53). What is slow hoping in frequency hoping spread spectrum?
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54). The signal to interference ration in frequency hoping spread spectrum is given by _______
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55). The applications of frequency hoping spread spectrum are ________
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56). In which multiple access scheme the bandwidth is limited?
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57). The issues in FDMA and TDMA resolved by ___________
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58). What is the sampling principle of flat top sampling?
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59). ________ is expection or expected value of random variable
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60). In viterbi algorithm __________ decoder is used to decode the received data
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Digital Communication Quiz Questions and Answers
61). The code word is a _______
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62). The hamming code is given by _______
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63). In hamming code we send data along with _____________
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64). The hamming code is used to _________
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65). The hamming code is represented by ________
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66). What is the sampling principle of natural sampling?
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67). The number of parity bits in block code is n-1 then the code is referred to as _____
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68). The limitation of capacity of channel to transmit information is referred as ______
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69). The words belongs to a block code are called as _________
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70). The entropy is defined as ______
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71). ________ is the intelligence or ideal or message in information theory
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72). The ____________ is defined as the process of converting binary data to digital signal
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73). ____________ is defined as the number of pulses per second
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74). ____________ is defined as the number of bits per second
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75). The sampled pulse amplitude modulation is off for most of the time in _________
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76). The speech signal range is from ______
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77). What is the sampling principle of ideal sampling?
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78). The block code repeats the information bits ________ times
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79). The channel capacity by Shannon Hartley is given by _______
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80). The noise interference in ideal sampling is _______
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