Amplitude Modulation Question & AnswersJune 5, 2021 By WatElectronics This article lists 100 Amplitude Modulation MCQs for engineering students. All the Amplitude Modulation Questions & Answers given below includes solution and link wherever possible to the relevant topic.In amplitude modulation, the amplitude of the carrier signal changes with respect to modulating signal. The bandwidth of the amplitude modulation signal is two times the frequency of modulating signal. The double sideband suppressed carrier, single sideband suppressed carrier, VSB, and conventional amplitude modulation are the types of amplitude modulation. In conventional amplitude modulation, the amplitude signal contains carrier and two sidebands, in double sideband, suppressed carrier the carrier is removed (only sidebands are present), in single sideband suppressed carrier only one sideband is present. 1). The frequency range of amplitude modulation is between _________540-1600Hz940-1600Hz140-1600Hz240-1600HzHintThe frequency range of amplitude modulation is between 540-1600Hz 2). The amplitude modulation method was introduced in _____________2000201019801870HintThe amplitude modulation method was introduced in 1870 3). For a modulating signal ________ line is the reference lineModulated peakPeakCarrier peakNone of the aboveHintFor a modulating signal carrier peak line is the reference line 4). The circuit which is used to produce the amplitude modulation is __________ModulatorDuplexerBoth a and bNone of the aboveHintThe circuit which is used to produce the amplitude modulation is a modulator 5). The overmodulation occurs when the modulating signal voltage is ______________ than the carrier voltageGreaterLessEqualNone of the aboveHintThe overmodulation occurs when the modulating signal voltage is greater than the carrier voltage 6). The amplitude modulation spectrum consists of _________ sideband frequencies and also a carrier frequencyUpperLowerBoth upper and lowerNone of the aboveHintThe amplitude modulation spectrum consists of lower & upper sideband frequencies and also a carrier frequency 7). The amplitude modulation categorized into _________OneTwoThreeFourHintThe amplitude modulation categorized into four types they are DSB-SC, SSB-SC, VSB, and conventional AM 8). The amplitude modulation used in _________Digital communicationTelemetryAnalog communicationAll of the aboveHintThe amplitude modulation used in both digital & analog communication, telemetry, etc 9). Which modulation consists of both lower and upper sidebands?DSB-SCVSBSSB-SCNone of the aboveHintThe double side band suppressed carrier consists of both lower and upper sidebands 10). Which modulation consists of only upper or only lower sideband?DSB-SCVSBSSB-SCNone of the aboveHintThe single-sideband suppressed carrier of the only upper or only lower sideband 11). The advantages of amplitude modulation are __________EconomicalInexpensiveSimpler to implementAll of the aboveHintThe amplitude modulation is simple to implement and they are economical and inexpensive 12). Amplitude modulation is a type of ________ modulationCarrierPhaseBoth a and bNone of the aboveHintThe amplitude modulation is a type of carrier modulation 13). The amplitude modulation used in _________TV picturesRadio broadcastingFacsimile transmissionAll of the aboveHintThe amplitude modulation used in TV pictures, radio broadcasting facsimile transmission, etc 14). The bandwidth of amplitude modulation is ________5KHz2KHz7KHz10KHzHintThe bandwidth of amplitude modulation is 10KHz 15). The standard value of intermediate frequency in amplitude modulation receivers is _______50KHz20KHz455KHz100KHzHintThe standard value of intermediate frequency in amplitude modulation receivers is 455KHz 16). In amplitude modulation the amplitude ____________VariesConstantDoesn't variesNone of the aboveHintIn amplitude modulation the amplitude varies 17). The frequency and phase of the carrier remains _______ in amplitude modulationVariesConstantDoesn't variesNone of the aboveHintThe frequency and phase of the carrier remains constant in amplitude modulation 18). Which one is a switching double sideband suppressed carrier modulator?Ring modulatorSeries bridge modulatorShunt bridge modulatorAll of the aboveHintRing modulator, series, and shunt bridge modulators all are switching double sideband suppressed carrier modulators 19). The polarity of binary input in QAM is ________PolarUnipolarBipolarNone of the aboveHintThe polarity of binary input in QAM is polar 20). What is the standard form of QAM?Quality Amplitude ModulationQuadrature Amplitude ModulationQuadrature Analog ModulationNone of the aboveHintThe standard form of QAM is Quadrature Amplitude Modulation 21). _________ are the applications of quadrature amplitude modulationTerrestrial digital TV broadcastingDigital video broadcastingBoth a and bNone of the aboveHintTerrestrial digital TV broadcasting, digital video broadcasting, etc are the applications of quadrature amplitude modulation 22). The quadrature amplitude modulation are ____________Susceptible to noiseOnly coherent detection is possibleIt is using the linear amplifier which is having power wastageAll of the aboveHintThe quadrature amplitude modulation are susceptible to noise, only coherent detection is possible in QAM, and it is using the linear amplifier which is having power wastage 23). In quadrature amplitude modulation the messages are encoded into ________ of the carrierAmplitudePhaseFrequencyBoth a and bHintIn quadrature amplitude modulation the messages are encoded into both amplitude and phase of the carrier 24). The bandwidth of the amplitude signal is ___________ times the frequency of the modulating signalOneTwoThreeFourHintThe bandwidth of the amplitude signal is two times the frequency of the modulating signal 25). The quadrature amplitude modulation constellations are __________ and they involve two orthogonal basis signalOne dimensionalTwo dimensionalThree dimensionalNone of the aboveHintThe quadrature amplitude modulation constellations are two dimensional and they involve two orthogonal basis signalAmplitude Modulation MCQs for Quiz 26). Which one of the following is an analog modulation?FMFSKASKNone of the aboveHintThe frequency modulation is a type of an analog modulation 27). Which one of the following is a digital modulation?QAMQPSKBPSKNone of the aboveHintThe quadrature amplitude modulation is a type of digital modulation 28). Which method is used in amplitude modulation signal demodulation?Square law demodulationQuadrature amplitude modulationFM to AM conversionBoth a and bHintSquare law demodulation and QAM methods are used in amplitude modulation signal demodulation 29). Which one of the following is a basic technique of frequency modulation signal demodulation?Square law demodulationCoherent demodulationFM to AM conversionBoth a and bHintFM to AM conversion is a basic technique of frequency modulation signal demodulation 30). _________ is also known as slope detectionSquare law demodulationCoherent demodulationFM to AM conversionBoth a and bHintFM to AM conversion is also known as slope detection 31). In FM to AM conversion, the input of the frequency-modulated signal converted into amplitude modulated signal by ____________IntegratorComparatorDifferentiatorNone of the aboveHintIn FM to AM conversion, the input of the frequency-modulated signal converted into amplitude modulated signal by differentiator 32). The number of sidebands in amplitude modulation is _________OneTwoThreeFourHintThe number of sidebands in amplitude modulation is two 33). ____________are the constant parameters in amplitude modulationFrequencyPhaseAmplitudeBoth a and bHintBoth frequency and phase are the constant parameters in amplitude modulation 34). _____________ are the constant parameters in frequency modulationFrequencyPhaseAmplitudeBoth b and cHintBoth phase and amplitude are the constant parameters in frequency modulation 35). The consumption of bandwidth in frequency modulation is _________10KHz50KHz80KHz70KHzHintThe consumption of bandwidth in frequency modulation is 80KHz 36). The consumption of bandwidth in frequency modulation is _________10KHz30KHz80KHz70KHzHintThe consumption of bandwidth in frequency modulation is 30KHz 37). What are the advantages of sideband modulation?Bandwidth is lessNoise is lessSignal fading is lessAll of the aboveHintIn sideband modulation the bandwidth, noise, and signal fading is less 38). The standard form of SSB-SC is a _______ sideband suppressed carrierSingleSimpleSuppressedNone of the aboveHintThe standard form of SSB-SC is a single sideband suppressed carrier 39). The standard form of DSB-SC is _________ sideband suppressed carrierDoubleDifferentialDouble or DifferentialNone of the aboveHintThe standard form of DSB-SC is double sideband suppressed carrier 40). The superheterodyne receivers have better _________SensitivitySelectivityBoth a and bNone of the aboveHintThe superheterodyne receivers have better sensitivity and selectivity 41). The amplitude modulation spectrum ___________Doesn’t consists of carrierConsists of carrierUsed in electronic communicationBoth b and cHintThe amplitude modulation spectrum consists of a carrier and used in electronic communicationRead more about Amplitude Modulation 42). The double sideband suppressed carrier demodulated using ________High pass filterLow pass filterBoth a and b)None of the aboveHintThe double sideband suppressed carrier demodulated using low pass filter 43). The frequency modulated signal can be detected by using ________ filter and it is widely used above ________ frequencyBandpass, 10MHzBandpass, 20MHzBandpass, 30MHzNone of the aboveHintThe frequency modulated signal can be detected by using a bandpass filter and it is widely used above 30MHz frequency 44). The Hilbert transform is a ______ systemLinearNon-linearBoth a and bNone of the aboveHintThe Hilbert transform is a non-linear system 45). The ________ is an amplitude modulation demodulation techniqueSquare law demodulatorEnvelope detectorPLL detectorBoth a and bHintThe square law demodulator and envelope detector are the amplitude modulation demodulation technique 46). The ring modulator is a ________ modulatorNot a productProductSumNone of the aboveHintThe ring modulator is a product modulator 47). The maximum transmission efficiency of an amplitude modulation signal is _______1%5%33.3%3%HintThe maximum transmission efficiency of an amplitude modulation signal is 33.3% 48). The quadrature amplitude modulation used in ____________NTSCPALBoth a and bNone of the aboveHintThe quadrature amplitude modulation used in both NTSC and PAL television systems, etc 49). The generation of single sideband suppressed carrier signal is done by __________discrimination methodsPhaseFrequencyBoth a and bNone of the aboveHintThe generation of single sideband suppressed carrier signal is done by both phase and frequency discrimination methods 50). The costas receiver used for _____________DSB-SCSSBBoth a and bNone of the aboveHintThe costas receiver used for DSB-SCAmplitude Modulation MCQs for Interviews 51). The square-law diode and switching modulations are examples of _________ modulationLow levelHigh levelBoth a and bNone of the aboveHintThe square-law diode and switching modulations are examples of low-level modulation 52). The ring modulator consists __________ diodesOneTwoThreeFourHintThe ring modulator consists of four diodes 53). The _____________ is also known as bandwidth conservation schemeQuadrature Amplitude ModulationPulse Amplitude ModulationBoth a and bNone of the aboveHintThe quadrature amplitude modulation is also known as bandwidth conservation scheme 54). The VSB signals detected by ____________Low pass filterHigh pass filterSynchronous detectionNone of the aboveHintThe VSB signals detected by synchronous detection 55). The carrier signal is a __________ frequency signal in modulation techniquesHighLowConstantNone of the aboveHintThe carrier signal is a high-frequency signal in modulation techniques 56). In fading channels the performance of ___________ amplitude modulation systems is poorSingle sidebandDouble sidebandBoth a and bNone of the aboveHintIn fading channels the performance of single sideband amplitude modulation systems is poor 57). What is the standard form of FFSR?Fixed Forward Signal RegenerationForward Fixed Signal RegenerationFeed Forward Signal RegenerationNone of the aboveHintThe standard form of FFSR is Feed-Forward Signal Regeneration 58). In amplitude modulation systems the product detector is also known as ___________IntegratorComparatorDifferentiatorNone of the aboveHintIn amplitude modulation systems the product detector is also known as the integrator 59). The video signals in TV are transmitted through _________ modulationAmplitudePhaseBoth a and bNone of the aboveHintThe video signals in TV are transmitted through amplitude modulation 60). In a communication system the redundancy is used to _______________Reduce efficiencyCorrect the errorsDetect the errorsAll of the aboveHintIn a communication system, redundancy is used to reduce efficiency and to correct and detect the errors 61). In frequency modulation receivers the impulse noise is reduced by __________IntegratorsLimitersComparatorsNone of the aboveHintIn frequency modulation receivers the impulse noise is reduced by limiters 62). In ____________ , only one side band is presentConventional AMDSB-SCSSB-SCNone of the aboveHintIn SSB-SC, only one sideband is present 63). The ratio of modulating signal voltage divided by carrier voltage is called _______Modulation indexAmplitude modulationPhase modulationNone of the aboveHintThe ratio of modulating signal voltage divided by carrier voltage is called modulation index 64). The modulation can be done by ________ modulationOnly frequencyOnly amplitudeBoth a and bNone of the aboveHintThe modulation can be done by frequency and amplitude modulations 65). A demodulator separates ___________ signal from modulated signalCarrierAudioEither audio or carrierNone of the aboveHintA demodulator separates either audio or carrier signal from the modulated signal 66). The carrier waves are __________ wavesLow-frequencyHigh-frequencyEither high or lowNone of the aboveHintThe carrier waves are high-frequency waves 67). For TV transmission __________ propagation is usedLine of sightEither a or bNone of the aboveHintFor TV transmission either line of sight or space wave propagation is used 68). For SW band radio transmission __________ propagation is usedLine of sightSpace waveSkywaveNone of the aboveHintFor SW band radio transmission skywave propagation is used 69). In grid modulator the efficiency and power output both are ________HighLowModerateNone of the aboveHintIn grid modulator the efficiency and power output both are low 70). __________ are the terminals of triodeCathodeGridPlateAll of the aboveHintThe cathode, grid, and plate are the terminals of the triode 71). For grid and plate modulated ________ amplifier triode is usedClass AClass BClass CNone of the aboveHintFor grid and plate modulated class c amplifier triode is used 72). For satellite communication ___________ propagation is usedLine of sightSpace waveSkywaveNone of the aboveHintFor satellite communication space wave propagation is used 73). For MW band radio transmission ___________ propagation is usedLine of sightSpace waveSkywaveGround waveHintFor MW band radio transmission ground wave propagation is used 74). For collector modulator _______ amplifier is usedClass AClass BClass CAll of the aboveHintFor collector modulator class C amplifier is used 75). The amplitude modulation requires __________Large bandwidthLarge powerBoth a and bNone of the aboveHintThe amplitude modulation requires large bandwidth and large powerAmplitude Modulation MCQs for Students 76). In TV transmission the low level _________ is usedIF modulationPhase modulationBoth a and bNone of the aboveHintIn TV transmission the low level IF modulation is used 77). The amplitude modulation signal without a carrier is known as _____DSB-SCSSB-SCBoth a and bNone of the aboveHintThe amplitude modulation signal without a carrier is known as the DSB-SC signal 78). What is the standard form of VSB?Vertical Side BandVestigial Signal BandVestigial Side BandNone of the aboveHintThe standard form of VSB is Vestigial Side Band 79). The quadrature amplitude modulation is a combination of ___________ modulation techniquesAM and PMAM and QAMPM and QAMNone of the aboveHintThe quadrature amplitude modulation is a combination of both amplitude and phase modulation techniques 80). The transmission techniques are categorized into ________OneTwoThreeFourHintThe transmission techniques are categorized into two types they are baseband transmission and modulation technique 81). The transmission efficiency of amplitude modulation is ___________HighVery highLessNone of the aboveHintThe transmission efficiency of amplitude modulation is less Read more about Modulation 82). The transmission efficiency of double sideband suppressed carrier is ________LessBetter than AMLower than AMHighHintThe transmission efficiency of double sideband suppressed carrier is better than amplitude modulation 83). The transmission efficiency of a single sideband suppressed carrier is ________LessBetter than AMLower than AMBestHintThe transmission efficiency of a single sideband suppressed carrier is best to compare to other modulations 84). The number of modulating inputs in DSB-FC is _____________OneTwoThreeFourHintThe number of modulating inputs in DSB-FC is one 85). The number of modulating inputs in ISB is _____________OneTwoThreeFourHintThe number of modulating inputs in ISB is two 86). The transmission efficiency of VSB is _______ than SSBHigherLowerEqualNone of the aboveHintThe transmission efficiency of VSB is lower than SSB 87). The number of modulating inputs in DSB-SC is _____________OneTwoThreeFourHintThe number of modulating inputs in DSB-SC is one 88). The number of modulating inputs in VSB is _____________OneTwoThreeHintThe number of modulating inputs in VSB is two 89). The number of modulating inputs in SSB is _____________OneTwoThreeFourHintThe number of modulating inputs in SSB is one 90). In DSB-FC the power requirement to cover area is _________HighMediumVery smallModerateHintIn DSB-FC the power required to the cover area is highAmplitude Modulation Important MCQs with Hints 91). In DSB-SC the power requirement to cover area is _________HighMediumVery smallModerateHintIn DSB-SC the power required to the cover area is medium 92). In SSB the power requirement to cover area is _________HighMediumVery smallModerateHintIn SSB the power required to the cover area is very small 93). In ISB the power requirement to cover area is _________HighMediumVery smallModerateHintIn ISB the power required to cover the area is moderate 94). In VSB the power requirement to cover area is _________HighMediumVery smallModerateHintIn VSB the power required to cover the area is moderate 95). In amplitude modulation, the bandwidth is _________ than frequency modulationLessVery highHighModerateHintIn amplitude modulation, the bandwidth is less than frequency modulation 96). The amplitude receivers are _________Not immune to noiseImmune to noiseReceives amplitude modulation wavesBoth a and cHintThe amplitude receivers are not immune to noise and these receivers receives amplitude modulation waves 97). In ____________ carrier is removedConventional AMDSB-SCSSB-SCNone of the aboveHintIn DSB-SC carrier is removed 98). On the same frequency, the amplitude modulation is __________ to operate more channelsPossible to operate only more channelNot possible to operate more channelsPossible to operate only one channelNone of the aboveHintOn the same frequency, the amplitude modulation is not possible to operate more channels 99). The wavelength of amplitude modulation is _____ than frequency modulationHigherLowerEqualNone of the aboveHintThe wavelength of amplitude modulation is higher than frequency modulation Read more about Frequency Modulation 100). In ____________ amplitude signal contains carrier and two sidebandsConventional AMDSB-SCSSB-SCNone of the aboveHintIn conventional AM the amplitude signal contains carrier and two sidebands Time is Up! Time's up
