Amplitude Modulation Question & Answers June 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 None Hint 2). The amplitude modulation method was introduced in _____________ 2000 2010 1980 1870 None Hint 3). For a modulating signal ________ line is the reference line Modulated peak Peak Carrier peak None of the above None Hint 4). The circuit which is used to produce the amplitude modulation is __________ Modulator Duplexer Both a and b None of the above None Hint 5). The overmodulation occurs when the modulating signal voltage is ______________ than the carrier voltage Greater Less Equal None of the above None Hint 6). The amplitude modulation spectrum consists of _________ sideband frequencies and also a carrier frequency Upper Lower Both upper and lower None of the above None Hint 7). The amplitude modulation categorized into _________ One Two Three Four None Hint 8). The amplitude modulation used in _________ Digital communication Telemetry Analog communication All of the above None Hint 9). Which modulation consists of both lower and upper sidebands? DSB-SC VSB SSB-SC None of the above None Hint 10). Which modulation consists of only upper or only lower sideband? DSB-SC VSB SSB-SC None of the above None Hint 11). The advantages of amplitude modulation are __________ Economical Inexpensive Simpler to implement All of the above None Hint 12). Amplitude modulation is a type of ________ modulation Carrier Phase Both a and b None of the above None Hint 13). The amplitude modulation used in _________ TV pictures Radio broadcasting Facsimile transmission All of the above None Hint 14). The bandwidth of amplitude modulation is ________ 5KHz 2KHz 7KHz 10KHz None Hint 15). The standard value of intermediate frequency in amplitude modulation receivers is _______ 50KHz 20KHz 455KHz 100KHz None Hint 16). In amplitude modulation the amplitude ____________ Varies Constant Doesn't varies None of the above None Hint 17). The frequency and phase of the carrier remains _______ in amplitude modulation Varies Constant Doesn't varies None of the above None Hint 18). Which one is a switching double sideband suppressed carrier modulator? Ring modulator Series bridge modulator Shunt bridge modulator All of the above None Hint 19). The polarity of binary input in QAM is ________ Polar Unipolar Bipolar None of the above None Hint 20). What is the standard form of QAM? Quality Amplitude Modulation Quadrature Amplitude Modulation Quadrature Analog Modulation None of the above None Hint 21). _________ are the applications of quadrature amplitude modulation Terrestrial digital TV broadcasting Digital video broadcasting Both a and b None of the above None Hint 22). 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 None Hint 23). In quadrature amplitude modulation the messages are encoded into ________ of the carrier Amplitude Phase Frequency Both a and b None Hint 24). The bandwidth of the amplitude signal is ___________ times the frequency of the modulating signal One Two Three Four None Hint 25). The quadrature amplitude modulation constellations are __________ and they involve two orthogonal basis signal One dimensional Two dimensional Three dimensional None of the above None Hint Amplitude Modulation MCQs for Quiz 26). Which one of the following is an analog modulation? FM FSK ASK None of the above None Hint 27). Which one of the following is a digital modulation? QAM QPSK BPSK None of the above None Hint 28). Which method is used in amplitude modulation signal demodulation? Square law demodulation Quadrature amplitude modulation FM to AM conversion Both a and b None Hint 29). 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 None Hint 30). _________ is also known as slope detection Square law demodulation Coherent demodulation FM to AM conversion Both a and b None Hint 31). 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 None Hint 32). The number of sidebands in amplitude modulation is _________ One Two Three Four None Hint 33). ____________are the constant parameters in amplitude modulation Frequency Phase Amplitude Both a and b None Hint 34). _____________ are the constant parameters in frequency modulation Frequency Phase Amplitude Both b and c None Hint 35). The consumption of bandwidth in frequency modulation is _________ 10KHz 50KHz 80KHz 70KHz None Hint 36). The consumption of bandwidth in frequency modulation is _________ 10KHz 30KHz 80KHz 70KHz None Hint 37). What are the advantages of sideband modulation? Bandwidth is less Noise is less Signal fading is less All of the above None Hint 38). The standard form of SSB-SC is a _______ sideband suppressed carrier Single Simple Suppressed None of the above None Hint 39). The standard form of DSB-SC is _________ sideband suppressed carrier Double Differential Double or Differential None of the above None Hint 40). The superheterodyne receivers have better _________ Sensitivity Selectivity Both a and b None of the above None Hint 41). The amplitude modulation spectrum ___________ Doesn’t consists of carrier Consists of carrier Used in electronic communication Both b and c None Hint Read 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 None Hint 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 None Hint 44). The Hilbert transform is a ______ system Linear Non-linear Both a and b None of the above None Hint 45). The ________ is an amplitude modulation demodulation technique Square law demodulator Envelope detector PLL detector Both a and b None Hint 46). The ring modulator is a ________ modulator Not a product Product Sum None of the above None Hint 47). The maximum transmission efficiency of an amplitude modulation signal is _______ 1% 5% 33.3% 3% None Hint 48). The quadrature amplitude modulation used in ____________ NTSC PAL Both a and b None of the above None Hint 49). The generation of single sideband suppressed carrier signal is done by __________discrimination methods Phase Frequency Both a and b None of the above None Hint 50). The costas receiver used for _____________ DSB-SC SSB Both a and b None of the above None Hint Amplitude Modulation MCQs for Interviews 51). The square-law diode and switching modulations are examples of _________ modulation Low level High level Both a and b None of the above None Hint 52). The ring modulator consists __________ diodes One Two Three Four None Hint 53). The _____________ is also known as bandwidth conservation scheme Quadrature Amplitude Modulation Pulse Amplitude Modulation Both a and b None of the above None Hint 54). The VSB signals detected by ____________ Low pass filter High pass filter Synchronous detection None of the above None Hint 55). The carrier signal is a __________ frequency signal in modulation techniques High Low Constant None of the above None Hint 56). In fading channels the performance of ___________ amplitude modulation systems is poor Single sideband Double sideband Both a and b None of the above None Hint 57). What is the standard form of FFSR? Fixed Forward Signal Regeneration Forward Fixed Signal Regeneration Feed Forward Signal Regeneration None of the above None Hint 58). In amplitude modulation systems the product detector is also known as ___________ Integrator Comparator Differentiator None of the above None Hint 59). The video signals in TV are transmitted through _________ modulation Amplitude Phase Both a and b None of the above None Hint 60). In a communication system the redundancy is used to _______________ Reduce efficiency Correct the errors Detect the errors All of the above None Hint 61). In frequency modulation receivers the impulse noise is reduced by __________ Integrators Limiters Comparators None of the above None Hint 62). In ____________ , only one side band is present Conventional AM DSB-SC SSB-SC None of the above None Hint 63). The ratio of modulating signal voltage divided by carrier voltage is called _______ Modulation index Amplitude modulation Phase modulation None of the above None Hint 64). The modulation can be done by ________ modulation Only frequency Only amplitude Both a and b None of the above None Hint 65). A demodulator separates ___________ signal from modulated signal Carrier Audio Either audio or carrier None of the above None Hint 66). The carrier waves are __________ waves Low-frequency High-frequency Either high or low None of the above None Hint 67). For TV transmission __________ propagation is used Line of sight Either a or b None of the above None Hint 68). For SW band radio transmission __________ propagation is used Line of sight Space wave Skywave None of the above None Hint 69). In grid modulator the efficiency and power output both are ________ High Low Moderate None of the above None Hint 70). __________ are the terminals of triode Cathode Grid Plate All of the above None Hint 71). For grid and plate modulated ________ amplifier triode is used Class A Class B Class C None of the above None Hint 72). For satellite communication ___________ propagation is used Line of sight Space wave Skywave None of the above None Hint 73). For MW band radio transmission ___________ propagation is used Line of sight Space wave Skywave Ground wave None Hint 74). For collector modulator _______ amplifier is used Class A Class B Class C All of the above None Hint 75). The amplitude modulation requires __________ Large bandwidth Large power Both a and b None of the above None Hint Amplitude Modulation MCQs for Students 76). In TV transmission the low level _________ is used IF modulation Phase modulation Both a and b None of the above None Hint 77). The amplitude modulation signal without a carrier is known as _____ DSB-SC SSB-SC Both a and b None of the above None Hint 78). What is the standard form of VSB? Vertical Side Band Vestigial Signal Band Vestigial Side Band None of the above None Hint 79). The quadrature amplitude modulation is a combination of ___________ modulation techniques AM and PM AM and QAM PM and QAM None of the above None Hint 80). The transmission techniques are categorized into ________ One Two Three Four None Hint 81). The transmission efficiency of amplitude modulation is ___________ High Very high Less None of the above None Hint Read more about Modulation 82). The transmission efficiency of double sideband suppressed carrier is ________ Less Better than AM Lower than AM High None Hint 83). The transmission efficiency of a single sideband suppressed carrier is ________ Less Better than AM Lower than AM Best None Hint 84). The number of modulating inputs in DSB-FC is _____________ One Two Three Four None Hint 85). The number of modulating inputs in ISB is _____________ One Two Three Four None Hint 86). The transmission efficiency of VSB is _______ than SSB Higher Lower Equal None of the above None Hint 87). The number of modulating inputs in DSB-SC is _____________ One Two Three Four None Hint 88). The number of modulating inputs in VSB is _____________ One Two Three None Hint 89). The number of modulating inputs in SSB is _____________ One Two Three Four None Hint 90). In DSB-FC the power requirement to cover area is _________ High Medium Very small Moderate None Hint Amplitude Modulation Important MCQs with Hints 91). In DSB-SC the power requirement to cover area is _________ High Medium Very small Moderate None Hint 92). In SSB the power requirement to cover area is _________ High Medium Very small Moderate None Hint 93). In ISB the power requirement to cover area is _________ High Medium Very small Moderate None Hint 94). In VSB the power requirement to cover area is _________ High Medium Very small Moderate None Hint 95). In amplitude modulation, the bandwidth is _________ than frequency modulation Less Very high High Moderate None Hint 96). The amplitude receivers are _________ Not immune to noise Immune to noise Receives amplitude modulation waves Both a and c None Hint 97). In ____________ carrier is removed Conventional AM DSB-SC SSB-SC None of the above None Hint 98). 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 None Hint 99). The wavelength of amplitude modulation is _____ than frequency modulation Higher Lower Equal None of the above None Hint Read more about Frequency Modulation 100). In ____________ amplitude signal contains carrier and two sidebands Conventional AM DSB-SC SSB-SC None of the above None Hint Time's up
