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Digital Modulation Question & Answers

February 28, 2022 By WatElectronics

This article lists 50 Digital Modulation MCQs for engineering students. All the Digital Modulation Questions and Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on Digital Modulation.

Digital communication deals with transmitting and receiving the data in digital form. Three main blocks involve in digital communication namely, transmitter, receiver, and communication channel. Where the transmitter is present at the sender's end and the receiver at the recipient's end and in between lies the communication channel.

Modulation is the procedure to represent a radio wave by converting the raw data added with an electronic/optical-based carrier signal into digital /radio waveform. Modulation is classified into 2 types Analog modulation and Digital modulation.

Analog modulation is further classified as Amplitude Modulation (AM), Phase Modulation (PM), and Frequency Modulation (FM). Digital modulation is the method of encoding binary information (digital data) of a signal in the form of phase, frequency, and amplitude of the transmitted signal.

Digital modulations are classified as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK). Where each of the digital modulation for AM(PAM, QAM), PM (PSK, DPSK, OPSK), FM (FSK), continuous phase modulation (GMSK, MSK, CPFSK) and Trellis coded modulation (PSK and QAM) have further modulation methods.
Digital modulation benefits in terms of finite process, higher noise immunity, and multiplexing property. Digital modulation is deployed in modems, telemetry systems, radiosondes, etc.

1). The source used in digital communication is discrete in terms of _____ parameter?
Hint2 parameters.
2). How many main components are used in digital communication?
HintOdd value.
3). Modulation of a signal is performed at ____ component in digital communication?
HintSenders end.
4). De-modulation of a signal is performed at ____ component in digital communication?
HintReceipting.
5). Digitally modulated signals are represented using _____?
Hint3 forms.
6). Each symbol holds ____ number of information?
HintMaximum value.
7). Which of the following are the advantages of digital modulation?
Hint3 advantages.
8). Which of the following are the types of analog modulation?
Hint3 types.
9). Data in digital modulation is ______ form?
HintAperiodic.
10). Which of the following are the digital modulation techniques?
Hint3 types.
11). Abbreviate ASK?
HintSignal heights measurement.
Read more about ASK.
12). Abbreviate PSK?
HintRelated to angle of signal.
Read more about PSK.
13). Abbreviate FSK?
HintMeasured in Hertz.
14). Which of the following are the applications of ASK?
Hint3 applications.
15). ASK modulation is also called ____?
Hint2 names.

Digital Modulation Questions and Answers

16). Which of the following is the application of FSK?
Hint3 applications.
18). FSK transmitters deploys ____ number of oscillators?
HintOdd number.
17). FSK is further classified into ____ types?
HintEven number.
19). Which of the following is the advantage of continuous phase frequency shift keying?
Hint3 advantages.
20). How many inputs are provided to FSK block of 2 by 1 MUX?
HintOdd value.
Read more about MUX.
21). FSK modulated signals are of ____ types?
HintEven number.
22). A mark frequency is represented with ______ logic?
HintHigh logic.
23). A space frequency is represented with ______ logic?
HintLogic low.
24). Which of the following are the formulas of carrier signals in FM 2by 1 mux?
Hint2 formulas.
25). The process of reconstructing back the original signal is called ____?
HintPerformed at receivers end.
26). How many types of FSK demodulations exists?
HintEven number.
27). Analog signals exhibits ____ that degrades signals strength?
Hint3 parameters.
28). How many input signals are required in ASK?
HintEven number.
29). A coherent detection is also called ___?
HintPeriodic detection.
30). A non-coherent detection is also called ___?
Hintdiscreate time.

Digital Modulation MCQs for Quiz

31). Which of the following are the components of ASK coherent detection block?
Hint3 components.
Read more about Low Pass Filter.
32). Which of the following are the components of ASK non-coherent detection block?
Hint3 components.
Read more about Comparator.
33). Which of the following are the applications of PSK?
Hint3 applications.
34). Which of the following are the advantages of PSK?
Hint3 advantages.
35). Which of the following are the disadvantages of PSK?
Hint3 disadvantages.
36). PSK are classified in to ____ types?
HintEven number.
Read more about PSK.
37). QPSK stands for ____?
HintTwo bits are modulated at once.
38). M- ary digital technique transmits ____ number of bits per time?
HintHigher value.
39). M-ary techniques are classified in to ___ types?
HintOdd number.
40). Which of the following are the modulation methods of AM?
Hint2 types.

Digital Modulation MCQs for Interviews

41). Which of the following are the modulation methods of continuous phase modulation?
Hint3 types.
42). Which of the following are the modulation methods of Trellis coded modulation?
Hint2 methods.
43). Binary data is represented in form of _____?
HintEither of 2 digits.
44). In which of the following digital modulation carrier wave switches between 0 and 1 based on applied input?
HintLow-frequency RF applications.
45). A modem is a combination of ____?
Hint3 combination.
46). ____ is the occupied frequency band by modulated signal?
HintA range of frequencies occupied by a signal that has not been modulated to higher frequencies.
47). ____ term defines logic state?
HintBinary value, either 0 or 1.
48). Symbol rate is also called _____?
HintThe number of bits that are conveyed or processed in a given unit of time.
49). Which of the following is the formula of baud rate?
HintPower value.
50). A carrier signal is of ___ wave shape?
HintA periodic waveform.
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