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.The amplitude modulation is categorized into four types they are DSB-SC, SSB-SC, VSB, and conventional AM. It is a type of carrier modulation used in both digital & analog communication, telemetry, etc. The amplitude modulation is simple to implement and they are economical and inexpensive. Amplitude modulation is a type of carrier modulation used in TV pictures, radio broadcasting facsimile transmission, etc. The bandwidth of amplitude modulation is 10KHz. The overmodulation occurs when the modulating signal voltage is greater than the carrier voltage. The frequency range of amplitude modulation is between 540-1600Hz. The circuit which is used to produce the amplitude modulation is a modulator.1). The frequency range of amplitude modulation is between _________ 540-1600Hz 940-1600Hz 140-1600Hz 240-1600Hz HintThe frequency range of amplitude modulation is between 540-1600Hz2). The amplitude modulation method was introduced in _____________ 2000 2010 1980 1870 HintThe amplitude modulation method was introduced in 18703). For a modulating signal ________ line is the reference line Modulated peak Peak Carrier peak None of the above HintFor a modulating signal carrier peak line is the reference line4). The circuit which is used to produce the amplitude modulation is __________ Modulator Duplexer Both a and b None of the above HintThe circuit which is used to produce the amplitude modulation is a modulator5). The overmodulation occurs when the modulating signal voltage is ______________ than the carrier voltage Greater Less Equal None of the above HintThe overmodulation occurs when the modulating signal voltage is greater than the carrier voltage6). The amplitude modulation spectrum consists of _________ sideband frequencies and also a carrier frequency Upper Lower Both upper and lower None of the above HintThe amplitude modulation spectrum consists of lower & upper sideband frequencies and also a carrier frequency7). The amplitude modulation categorized into _________ One Two Three Four HintThe amplitude modulation categorized into four types they are DSB-SC, SSB-SC, VSB, and conventional AM8). The amplitude modulation used in _________ Digital communication Telemetry Analog communication All of the above HintThe amplitude modulation used in both digital & analog communication, telemetry, etc9). Which modulation consists of both lower and upper sidebands? DSB-SC VSB SSB-SC None of the above HintThe double side band suppressed carrier consists of both lower and upper sidebands10). Which modulation consists of only upper or only lower sideband? DSB-SC VSB SSB-SC None of the above HintThe single-sideband suppressed carrier of the only upper or only lower sideband11). The advantages of amplitude modulation are __________ Economical Inexpensive Simpler to implement All of the above HintThe amplitude modulation is simple to implement and they are economical and inexpensive12). Amplitude modulation is a type of ________ modulation Carrier Phase Both a and b None of the above HintThe amplitude modulation is a type of carrier modulation13). The amplitude modulation used in _________ TV pictures Radio broadcasting Facsimile transmission All of the above HintThe amplitude modulation used in TV pictures, radio broadcasting facsimile transmission, etc14). The bandwidth of amplitude modulation is ________ 5KHz 2KHz 7KHz 10KHz HintThe bandwidth of amplitude modulation is 10KHz15). The standard value of intermediate frequency in amplitude modulation receivers is _______ 50KHz 20KHz 455KHz 100KHz HintThe standard value of intermediate frequency in amplitude modulation receivers is 455KHz16). In amplitude modulation the amplitude ____________ Varies Constant Doesn't varies None of the above HintIn amplitude modulation the amplitude varies17). The frequency and phase of the carrier remains _______ in amplitude modulation Varies Constant Doesn't varies None of the above HintThe frequency and phase of the carrier remains constant in amplitude modulation18). Which one is a switching double sideband suppressed carrier modulator? Ring modulator Series bridge modulator Shunt bridge modulator All of the above HintRing modulator, series, and shunt bridge modulators all are switching double sideband suppressed carrier modulators 19). The polarity of binary input in QAM is ________ Polar Unipolar Bipolar None of the above HintThe polarity of binary input in QAM is polar20). What is the standard form of QAM? Quality Amplitude Modulation Quadrature Amplitude Modulation Quadrature Analog Modulation None of the above HintThe standard form of QAM is Quadrature Amplitude Modulation21). _________ are the applications of quadrature amplitude modulation Terrestrial digital TV broadcasting Digital video broadcasting Both a and b None of the above HintTerrestrial digital TV broadcasting, digital video broadcasting, etc are the applications of quadrature amplitude modulation22). The quadrature amplitude modulation are ____________ Susceptible to noise Only coherent detection is possible It is using the linear amplifier which is having power wastage All of the above HintThe 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 wastage23). In quadrature amplitude modulation the messages are encoded into ________ of the carrier Amplitude Phase Frequency Both a and b HintIn quadrature amplitude modulation the messages are encoded into both amplitude and phase of the carrier24). The bandwidth of the amplitude signal is ___________ times the frequency of the modulating signal One Two Three Four HintThe bandwidth of the amplitude signal is two times the frequency of the modulating signal25). The quadrature amplitude modulation constellations are __________ and they involve two orthogonal basis signal One dimensional Two dimensional Three dimensional None of the above HintThe quadrature amplitude modulation constellations are two dimensional and they involve two orthogonal basis signalAmplitude Modulation MCQs for Quiz26). Which one of the following is an analog modulation? FM FSK ASK None of the above HintThe frequency modulation is a type of an analog modulation27). Which one of the following is a digital modulation? QAM QPSK BPSK None of the above HintThe quadrature amplitude modulation is a type of digital modulation28). Which method is used in amplitude modulation signal demodulation? Square law demodulation Quadrature amplitude modulation FM to AM conversion Both a and b HintSquare law demodulation and QAM methods are used in amplitude modulation signal demodulation29). Which one of the following is a basic technique of frequency modulation signal demodulation? Square law demodulation Coherent demodulation FM to AM conversion Both a and b HintFM to AM conversion is a basic technique of frequency modulation signal demodulation30). _________ is also known as slope detection Square law demodulation Coherent demodulation FM to AM conversion Both a and b HintFM to AM conversion is also known as slope detection31). In FM to AM conversion, the input of the frequency-modulated signal converted into amplitude modulated signal by ____________ Integrator Comparator Differentiator None of the above HintIn FM to AM conversion, the input of the frequency-modulated signal converted into amplitude modulated signal by differentiator32). The number of sidebands in amplitude modulation is _________ One Two Three Four HintThe number of sidebands in amplitude modulation is two33). ____________are the constant parameters in amplitude modulation Frequency Phase Amplitude Both a and b HintBoth frequency and phase are the constant parameters in amplitude modulation34). _____________ are the constant parameters in frequency modulation Frequency Phase Amplitude Both b and c HintBoth phase and amplitude are the constant parameters in frequency modulation35). The consumption of bandwidth in frequency modulation is _________ 10KHz 50KHz 80KHz 70KHz HintThe consumption of bandwidth in frequency modulation is 80KHz36). The consumption of bandwidth in frequency modulation is _________ 10KHz 30KHz 80KHz 70KHz HintThe consumption of bandwidth in frequency modulation is 30KHz37). What are the advantages of sideband modulation? Bandwidth is less Noise is less Signal fading is less All of the above HintIn sideband modulation the bandwidth, noise, and signal fading is less38). The standard form of SSB-SC is a _______ sideband suppressed carrier Single Simple Suppressed None of the above HintThe standard form of SSB-SC is a single sideband suppressed carrier39). The standard form of DSB-SC is _________ sideband suppressed carrier Double Differential Double or Differential None of the above HintThe standard form of DSB-SC is double sideband suppressed carrier40). The superheterodyne receivers have better _________ Sensitivity Selectivity Both a and b None of the above HintThe superheterodyne receivers have better sensitivity and selectivity41). The amplitude modulation spectrum ___________ Doesn’t consists of carrier Consists of carrier Used in electronic communication Both b and c HintThe 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 filter Low pass filter Both a and b )None of the above HintThe 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 ________ frequency Bandpass, 10MHz Bandpass, 20MHz Bandpass, 30MHz None of the above HintThe frequency modulated signal can be detected by using a bandpass filter and it is widely used above 30MHz frequency44). The Hilbert transform is a ______ system Linear Non-linear Both a and b None of the above HintThe Hilbert transform is a non-linear system45). The ________ is an amplitude modulation demodulation technique Square law demodulator Envelope detector PLL detector Both a and b HintThe square law demodulator and envelope detector are the amplitude modulation demodulation technique46). The ring modulator is a ________ modulator Not a product Product Sum None of the above HintThe ring modulator is a product modulator47). 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 ____________ NTSC PAL Both a and b None of the above HintThe quadrature amplitude modulation used in both NTSC and PAL television systems, etc49). The generation of single sideband suppressed carrier signal is done by __________discrimination methods Phase Frequency Both a and b None of the above HintThe generation of single sideband suppressed carrier signal is done by both phase and frequency discrimination methods50). The costas receiver used for _____________ DSB-SC SSB Both a and b None of the above HintThe costas receiver used for DSB-SCAmplitude Modulation MCQs for Interviews51). The square-law diode and switching modulations are examples of _________ modulation Low level High level Both a and b None of the above HintThe square-law diode and switching modulations are examples of low-level modulation52). The ring modulator consists __________ diodes One Two Three Four HintThe ring modulator consists of four diodes53). The _____________ is also known as bandwidth conservation scheme Quadrature Amplitude Modulation Pulse Amplitude Modulation Both a and b None of the above HintThe quadrature amplitude modulation is also known as bandwidth conservation scheme54). The VSB signals detected by ____________ Low pass filter High pass filter Synchronous detection None of the above HintThe VSB signals detected by synchronous detection55). The carrier signal is a __________ frequency signal in modulation techniques High Low Constant None of the above HintThe carrier signal is a high-frequency signal in modulation techniques56). In fading channels the performance of ___________ amplitude modulation systems is poor Single sideband Double sideband Both a and b None of the above HintIn fading channels the performance of single sideband amplitude modulation systems is poor57). What is the standard form of FFSR? Fixed Forward Signal Regeneration Forward Fixed Signal Regeneration Feed Forward Signal Regeneration None of the above HintThe standard form of FFSR is Feed-Forward Signal Regeneration58). In amplitude modulation systems the product detector is also known as ___________ Integrator Comparator Differentiator None of the above HintIn amplitude modulation systems the product detector is also known as the integrator59). The video signals in TV are transmitted through _________ modulation Amplitude Phase Both a and b None of the above HintThe video signals in TV are transmitted through amplitude modulation60). In a communication system the redundancy is used to _______________ Reduce efficiency Correct the errors Detect the errors All of the above HintIn a communication system, redundancy is used to reduce efficiency and to correct and detect the errors61). In frequency modulation receivers the impulse noise is reduced by __________ Integrators Limiters Comparators None of the above HintIn frequency modulation receivers the impulse noise is reduced by limiters62). In ____________ , only one side band is present Conventional AM DSB-SC SSB-SC None of the above HintIn SSB-SC, only one sideband is present63). The ratio of modulating signal voltage divided by carrier voltage is called _______ Modulation index Amplitude modulation Phase modulation None of the above HintThe ratio of modulating signal voltage divided by carrier voltage is called modulation index64). The modulation can be done by ________ modulation Only frequency Only amplitude Both a and b None of the above HintThe modulation can be done by frequency and amplitude modulations65). A demodulator separates ___________ signal from modulated signal Carrier Audio Either audio or carrier None of the above HintA demodulator separates either audio or carrier signal from the modulated signal66). The carrier waves are __________ waves Low-frequency High-frequency Either high or low None of the above HintThe carrier waves are high-frequency waves67). For TV transmission __________ propagation is used Line of sight Either a or b None of the above HintFor TV transmission either line of sight or space wave propagation is used68). For SW band radio transmission __________ propagation is used Line of sight Space wave Skywave None of the above HintFor SW band radio transmission skywave propagation is used69). In grid modulator the efficiency and power output both are ________ High Low Moderate None of the above HintIn grid modulator the efficiency and power output both are low70). __________ are the terminals of triode Cathode Grid Plate All of the above HintThe cathode, grid, and plate are the terminals of the triode71). For grid and plate modulated ________ amplifier triode is used Class A Class B Class C None of the above HintFor grid and plate modulated class c amplifier triode is used72). For satellite communication ___________ propagation is used Line of sight Space wave Skywave None of the above HintFor satellite communication space wave propagation is used73). For MW band radio transmission ___________ propagation is used Line of sight Space wave Skywave Ground wave HintFor MW band radio transmission ground wave propagation is used74). For collector modulator _______ amplifier is used Class A Class B Class C All of the above HintFor collector modulator class C amplifier is used75). The amplitude modulation requires __________ Large bandwidth Large power Both a and b None of the above HintThe amplitude modulation requires large bandwidth and large powerAmplitude Modulation MCQs for Students76). In TV transmission the low level _________ is used IF modulation Phase modulation Both a and b None of the above HintIn TV transmission the low level IF modulation is used77). The amplitude modulation signal without a carrier is known as _____ DSB-SC SSB-SC Both a and b None of the above HintThe amplitude modulation signal without a carrier is known as the DSB-SC signal78). What is the standard form of VSB? Vertical Side Band Vestigial Signal Band Vestigial Side Band None of the above HintThe standard form of VSB is Vestigial Side Band79). The quadrature amplitude modulation is a combination of ___________ modulation techniques AM and PM AM and QAM PM and QAM None of the above HintThe quadrature amplitude modulation is a combination of both amplitude and phase modulation techniques80). The transmission techniques are categorized into ________ One Two Three Four HintThe transmission techniques are categorized into two types they are baseband transmission and modulation technique81). The transmission efficiency of amplitude modulation is ___________ High Very high Less None of the above HintThe transmission efficiency of amplitude modulation is less Read more about Modulation82). The transmission efficiency of double sideband suppressed carrier is ________ Less Better than AM Lower than AM High HintThe transmission efficiency of double sideband suppressed carrier is better than amplitude modulation83). The transmission efficiency of a single sideband suppressed carrier is ________ Less Better than AM Lower than AM Best HintThe transmission efficiency of a single sideband suppressed carrier is best to compare to other modulations84). The number of modulating inputs in DSB-FC is _____________ One Two Three Four HintThe number of modulating inputs in DSB-FC is one85). The number of modulating inputs in ISB is _____________ One Two Three Four HintThe number of modulating inputs in ISB is two86). The transmission efficiency of VSB is _______ than SSB Higher Lower Equal None of the above HintThe transmission efficiency of VSB is lower than SSB87). The number of modulating inputs in DSB-SC is _____________ One Two Three Four HintThe number of modulating inputs in DSB-SC is one88). The number of modulating inputs in VSB is _____________ One Two Three HintThe number of modulating inputs in VSB is two89). The number of modulating inputs in SSB is _____________ One Two Three Four HintThe number of modulating inputs in SSB is one90). In DSB-FC the power requirement to cover area is _________ High Medium Very small Moderate HintIn DSB-FC the power required to the cover area is highAmplitude Modulation Important MCQs with Hints91). In DSB-SC the power requirement to cover area is _________ High Medium Very small Moderate HintIn DSB-SC the power required to the cover area is medium92). In SSB the power requirement to cover area is _________ High Medium Very small Moderate HintIn SSB the power required to the cover area is very small93). In ISB the power requirement to cover area is _________ High Medium Very small Moderate HintIn ISB the power required to cover the area is moderate94). In VSB the power requirement to cover area is _________ High Medium Very small Moderate HintIn VSB the power required to cover the area is moderate95). In amplitude modulation, the bandwidth is _________ than frequency modulation Less Very high High Moderate HintIn amplitude modulation, the bandwidth is less than frequency modulation96). The amplitude receivers are _________ Not immune to noise Immune to noise Receives amplitude modulation waves Both a and c HintThe amplitude receivers are not immune to noise and these receivers receives amplitude modulation waves 97). In ____________ carrier is removed Conventional AM DSB-SC SSB-SC None of the above HintIn DSB-SC carrier is removed98). On the same frequency, the amplitude modulation is __________ to operate more channels Possible to operate only more channel Not possible to operate more channels Possible to operate only one channel None of the above HintOn the same frequency, the amplitude modulation is not possible to operate more channels99). The wavelength of amplitude modulation is _____ than frequency modulation Higher Lower Equal None of the above HintThe wavelength of amplitude modulation is higher than frequency modulation Read more about Frequency Modulation100). In ____________ amplitude signal contains carrier and two sidebands Conventional AM DSB-SC SSB-SC None of the above HintIn conventional AM the amplitude signal contains carrier and two sidebands Time is Up! Time's up
