Amplifier with Negative Feedback Question & AnswersJuly 6, 2021 By WatElectronics This article lists 100 Amplifiers with Negative Feedback MCQs for engineering students. All the Amplifier with Negative Feedback Questions & Answers given below includes solution and link wherever possible to the relevant topic.The invention of negative feedback is done by Harold back in 1928. The negative feedback reduces the non-linear distortion and effect of noise, controls the output and input impedances, and extends the amplifier bandwidth. The series-shunt feedback, shunt-shunt feedback, shunt-series, and series-series feedback are the four basic feedback topologies. In negative feedback, both output and input are out of phase whereas in positive feedback they are in phase.It has increased stability & bandwidth, less amplitude, and harmonic distortions and at the same time, it has less frequency of phase distortion. Due to negative feedback, the noise reduces and the input and output can be modified as per the requirement in the negative feedback amplifier. 1). An emitter follower output impedance is ___________HighLowZeroVery highHintAn emitter follower output impedance is low 2). The emitter follower voltage gain is approximately equal to _________OneTwoThreeFourHintThe emitter follower voltage gain is approximately equal to one 3). If both input and output is voltage then the amplifier is called ________Voltage amplifierCurrent amplifierTransconductanceNone of the aboveHintIf both input and output is voltage then the amplifier is called a voltage amplifier 4). If both input and output is current then the amplifier is called ________Voltage amplifierCurrent amplifierTransconductanceNone of the aboveHintIf both input and output is current then the amplifier is called a current amplifier 5). The output current divided by input voltage is known as _______Voltage amplifierCurrent amplifierTransconductanceNone of the aboveHintThe output current divided by input voltage is known as transconductance 6). The negative feedback friction value is always less than _________OneTwoThreeFourHintThe negative feedback friction value is always less than one 7). The emitter follower input impedance is ________HighLowVery lowMediumHintThe emitter follower input impedance is high 8). _________ are the applications of negative feedback amplifierElectronic amplifier and large bandwidth amplifiersRegulated power suppliesBoth a and bNone of the aboveHintThe regulated power supplies, electronic amplifier, and large bandwidth amplifier, etc are the applications of negative feedback amplifier 9). The negative feedback circuits are of ___________ typesOneTwoThreeFourHintThe negative feedback circuits are of two types they are negative voltage feedback and negative current feedback 10). The negative voltage feedback categorized into __________ typesOneTwoThreeFourHintThe negative voltage feedback categorized into two types they are voltage series feedback and voltage shunt feedback 11). The negative current feedback categorized into __________ typesOneTwoThreeFourHintThe negative current feedback categorized into two types they are current series feedback and current shunt feedback 12). The shunt driven series fed also called _____________ seriesVoltageCurrentBoth a and bNone of the aboveHintThe shunt driven series fed also called voltage series 13). The shunt driven shunt fed also called _____________Voltage shuntCurrent shuntCurrent seriesNone of the aboveHintThe shunt driven shunt fed also called voltage shunt 14). The series driven series fed also called _____________Voltage shuntCurrent shuntCurrent seriesVoltage seriesHintThe series driven series fed also called current series 15). The series driven shunt fed also called _____________Voltage shuntCurrent shuntCurrent seriesVoltage seriesHintThe series driven shunt fed also called current shed 16). How many types of feedbacks are there?OneTwoThreeFourHintThere are two types of feedbacks they are positive and negative feedback 17). Which feedback increases the gain of the amplifier?PositiveNegativeBoth a and bNone of the aboveHintThe positive feedback increases the gain of the amplifier 18). ___________ are the disadvantages of positive feedbackInstabilityIncreasing distortionInstabilityAll of the aboveHintInstability, increasing distortion, instability are the disadvantages of positive feedback 19). ___________ are the disadvantages of positive feedbackIncrease in input impedanceDecrease in output impedanceReduction in noiseAll of the aboveHintAn increase in input impedance, decrease in output impedance, reduction in noise, are the disadvantages of positive feedback 20). How many parts does the feedback amplifier consist of?OneTwoThreeFourHintThe feedback amplifier consists of two parts they are feedback circuit and amplifier 21). The gain of the amplifier is defined as a ratio of ___________Output voltage/input voltageInput voltage/output voltageOutput voltage/input currentNone of the aboveHintThe gain of the amplifier is defined as a ratio of output voltage divided by input voltage 22). In series-shunt connection the forward-path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn series-shunt connection, the forward-path gain is the voltage gain 23). In series-shunt connection the reverse-path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn series-shunt connection the reverse-path gain is the voltage gain 24). In shunt-series connection the revers- path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn shunt-series connection the reverse-path gain is the current gain 25). In shunt-series connection the forward-path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn shunt-series connection the forward-path gain is the current gainAmplifier with Negative Feedback MCQ’s with Answers 26). Which feedback reduces the amplifier gain?PositiveNegativeBoth a and bNone of the aboveHintThe negative feedback reduces the amplifier gain 27). In series -series connection the forward-path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn series -series connection the forward-path gain is a trans-conductance 28). In series -series connection the reverse-path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn series -series connection the reverse-path gain is a trans-impedance 29). In shunt- shunt connection the reverse-path gain is __________Voltage gainCurrent gainTransconductanceTransimpedanceHintIn shunt-shunt connection the reverse-path gain is trans-conductance 30). In shunt- shunt connection the forward-path gain is __________Voltage gainCurrent gainTrans-conductanceTrans-impedanceHintIn shunt - shunt connection the forward-path gain is trans-impedance 31). The negative feedback _________Reduces gainIncreases linearlyBoth a and bNone of the aboveHintThe negative feedback reduces gain and increases linearly 32). The realistic op-amp has finite ____________Input and output impedanceFinite gainBoth a and bNone of the aboveHintThe realistic op-amp has finite input and output impedance and finite gain 33). The voltmeters have __________ input resistanceInfiniteFiniteZeroNone of the aboveHintThe voltmeters have an infinite input resistance 34). The amperometers have __________ input resistanceInfiniteFiniteZeroNone of the aboveHintThe amperometers have zero input resistance 35). ____________ connection increases the input impedanceSeries-seriesSeries-shuntShunt-shuntShunt-seriesHintThe series-shunt connection increases the input impedance 36). ____________ connection decreases the input impedanceSeries-seriesSeries-shuntShunt-shuntBoth b and cHintThe both series-shunt and shunt-shunt connections decrease the input impedance 37). ____________ connection decreases both input and output impedanceSeries-seriesSeries-shuntShunt-shuntBoth b and cHintThe shunt-shunt connection decreases both input and output impedance 38). ____________ connection increases both input and output impedanceSeries-seriesSeries-shuntShunt-shuntBoth b and cHintThe series-series connection increases both input and output impedance 39). The voltage amplifier is a ________Voltage controlled voltage sourceVoltage controlled current sourceCurrent controlled voltage sourceNone of the aboveHintThe voltage amplifier is a voltage-controlled voltage source 40). The current amplifier is a ________Voltage controlled voltage sourceVoltage controlled current sourceCurrent controlled voltage sourceCurrent controlled current sourceHintThe current amplifier is a current-controlled current source 41). The transconductance amplifier is a ____________Voltage controlled voltage sourceVoltage controlled current sourceCurrent controlled voltage sourceCurrent controlled current sourceHintThe transconductance amplifier is a voltage-controlled current source 42). The trans-impedance amplifier is a ____________Voltage controlled voltage sourceVoltage controlled current sourceCurrent controlled voltage sourceCurrent controlled current sourceHintThe trans-impedance amplifier is a current-controlled voltage source 43). The voltage amplifier uses _______ feedbackSeries-seriesSeries-shuntShunt-shuntBoth b and cHintThe voltage amplifier uses series-shunt feedback 44). The current amplifier uses _______ feedbackSeries-seriesSeries-shuntShunt-shuntShunt-seriesHintThe current amplifier uses shunt-series feedback 45). The trans-conductance amplifier uses _______ feedbackSeries-seriesSeries-shuntShunt-shuntShunt-seriesHintThe trans-conductance amplifier uses series-series feedback 46). The trans-impedance amplifier uses __________ feedbackSeries-seriesSeries-shuntShunt-shuntShunt-seriesHintThe trans-impedance amplifier uses shunt-shunt feedback 47). _________ feedback used in amplifiersPositiveNegativeBoth a and bNone of the aboveHintThe negative feedback used in amplifiers 48). The bandwidth increased in __________ feedbackPositiveNegativeBoth a and bNone of the aboveHintThe bandwidth increased in negative feedback 49). __________ feedback reduces the distortionPositiveNegativeBoth a and bNone of the aboveHintThe negative feedback reduces the distortion 50). __________ feedback increases the amplifier stabilityPositiveNegativeBoth a and bNone of the aboveHintThe negative feedback increases the amplifier stabilityAmplifier with Negative Feedback MCQ’s for Quiz 51). The ratio of output power divided by input power is known as ___________ gainVoltageCurrentPowerNone of the aboveHintThe ratio of output power divided by input power is known as power gain 52). The ratio of output current divided by input current is known as ___________ gainVoltageCurrentPowerNone of the aboveHintThe ratio of output current divided by input current is known as current gain The ratio of output current divided by input current is known as current gainVoltageCurrentPowerNone of the aboveHintThe ratio of output voltage divided by input voltage is known as voltage gain 54). The emitter follower has _____High current gainHigh power gainBoth a and bNone of the aboveHintThe emitter follower has high current gain and high power gain 55). The voltage gain is ________ in the source follower FET amplifierOneZeroFiniteInfiniteHintThe voltage gain is zero in the source follower FET amplifier 56). The current gain is ________ in the source follower FET amplifierLowHighVery lowMediumHintThe current gain is high in the source follower FET amplifier 57). The power gain is ________ in the source follower FET amplifierLowHighVery lowMediumHintThe power gain is medium in the source follower FET amplifier 58). The input resistance is _________ in the source follower FET amplifierLowHighVery highVery lowHintThe input resistance is very high in the source follower FET amplifier 59). The output resistance is _________ in the source follower FET amplifierLowHighVery highVery lowHintThe output resistance is low in the source follower FET amplifier 60). The input /output phase relationship is ________ in the source follower FET amplifier0 degrees180 degrees360 degrees90 degreesHintThe input /output phase relationship is zero degrees in the source follower FET amplifier 61). ________ feedback decreases the noiseVoltage series and voltage shuntCurrent series and current shuntBoth a and bNone of the aboveHintThe voltage series, voltage shunt, current series, and current shunt feedbacks decreases the noise 62). ________ feedback decreases the harmonic distortionVoltage series and voltage shuntCurrent series and current shuntBoth a and bNone of the aboveHintThe voltage series, voltage shunt, current series, and current shunt feedback decreases the harmonic distortion 63). ________ feedback increases the bandwidthVoltage series and voltage shuntCurrent series and current shuntBoth a and bNone of the aboveHintThe voltage series, voltage shunt, current series, and current shunt feedback increases the bandwidth 64). What is the feedback signal in voltage series topology?VoltageCurrentBoth a and bNone of the aboveHintIn the voltage series topology voltage is the feedback signal 65). What is the feedback signal in the current series topology?VoltageCurrentBoth a and bNone of the aboveHintIn the current series topology current is the feedback signal 66). What is the sample signal in the current series topology?VoltageCurrentBoth a and bNone of the aboveHintIn the current series topology current is the sample signal 67). What is the sample signal in the current shunt topology?VoltageCurrentBoth a and bNone of the aboveHintIn current shunt topology current is the sample signal 68). What is the sample signal in voltage series topology?VoltageCurrentBoth a and bNone of the aboveHintIn voltage series topology voltage is the sample signal 69). What is the sample signal in voltage shunt topology?VoltageCurrentBoth a and bNone of the aboveHintIn voltage shunt topology voltage is the sample signal 70). The positive feedback is also called as ____________Current seriesVoltage seriesRegenerativeDegenerativeHintThe positive feedback is also called regenerative 71). The negative feedback is also called as ____________Current seriesVoltage seriesRegenerativeDegenerativeHintThe negative feedback is also called degenerative 72). The stability is ____________ in positive feedbackLessHighVery highMediumHintThe stability is less in positive feedback 73). The stability is ____________ in negative feedbackBetterHighVery highComparatively moreHintThe stability is comparatively more in negative feedback 74). In the positive feedback, the feedback is taken from _____________ terminal of the op-ampNon-invertingInvertingEither a or bNone of the aboveHintIn the positive feedback, the feedback is taken from a non-inverting terminal of the op-amp 75). In the negative feedback, the feedback is taken from _____________ terminal of the op-ampNon-invertingInvertingEither a or bNone of the aboveHintIn the negative feedback, the feedback is taken from an inverting terminal of the op-ampAmplifier with Negative Feedback MCQ’s for Students 76). The sensitivity is ________ in the positive feedbackLowHighVery highBetterHintThe sensitivity is low in the positive feedback 77). The sensitivity is ________ in the negative feedbackLowHighVery highBetterHintThe sensitivity is high in the negative feedback 78). The phase shift in positive feedback is ___________0 degrees180 degrees360 degrees0 or 360 degreesHintThe phase shift in positive feedback is 0 or 360 degrees 79). The phase shift in negative feedback is ___________0 degrees180 degrees360 degrees0 or 360 degreesHintThe phase shift in negative feedback is 180 degrees 80). ___________ feedback requires external interruptionPositiveNegativeBoth a and bNone of the aboveHintThe positive feedback requires external interruption 81). The output resistance value decreases for _________Voltage seriesVoltage shuntBoth a and bNone of the aboveHintThe output resistance value decreases for both voltage series and voltage shunt 82). The input resistance for the voltage amplifier should be ___________OneZeroInfiniteNone of the aboveHintThe input resistance for the voltage amplifier should be infinite 83). The output resistance for the voltage amplifier should be ___________OneZeroInfiniteNone of the aboveHintThe output resistance for the voltage amplifier should be zero 84). The input resistance for the current amplifier should be ___________LessHighVery highNone of the aboveHintThe input resistance for the current amplifier should be less 85). The output resistance for the current amplifier should be ___________LessHighVery lessNone of the aboveHintThe output resistance for the current amplifier should be high 86). Both input and output resistance are high in __________ amplifierTrans-conductanceVoltageCurrentNone of the aboveHintBoth input and output resistance is high in trans-conductance amplifier 87). Both input and output resistance are less in __________ amplifierTrans-conductanceVoltageCurrentTrans-resistanceHintBoth input and output resistance are less in the trans-resistance amplifier 88). In the current series negative feedback, current indicates __________SamplingMixingBoth a and bNone of the aboveHintIn the current series negative feedback, the current indicates the sampling 89). In the current series negative feedback, series indicates __________SamplingMixingBoth a and bNone of the aboveHintIn the current series negative feedback, series indicates mixing 90). In __________ amplifier the output is an exact replica of an input signalIdealPracticalBoth a and bNone of the aboveHintIn an ideal amplifier, the output is an exact replica of an input signal 91). __________ amplifier will not amplify the mid-frequency region equallyIdealPracticalBoth a and bNone of the aboveHintThe practical amplifier will not amplify the mid-frequency region equallyRead more about Amplifier 92). The practical amplifier will not amplify the mid-frequency region equally due to ____________Non-linearityTemperature effectParameter variationAll of the aboveHintThe practical amplifier will not amplify the mid-frequency region equally due to non-linearity, temperature effect, and parameter variation 93). In negative feedback, both input and output are __________Out of phaseIn-phaseBoth a and bNone of the aboveHintIn negative feedback, both input and output are out of phase 94). In positive feedback both input and output are __________Out of phaseIn-phaseBoth a and bNone of the aboveHintIn positive feedback both input and output are in phase 95). __________ are the voltage samplingVoltage series and voltage shuntCurrent series and current shuntBoth a and bNone of the aboveHintThe voltage series and voltage shunt are the voltage samplings 96). __________ are the current samplingVoltage series and voltage shuntCurrent series and current shuntBoth a and bNone of the aboveHintThe current series and current shunt are the current samplings 97). The feedback system consists of _________ blocksOneTwoThreeFourHintThe feedback system consists of four blocks they are amplifier, sampling network, feedback network, and mixing network 98). The feedback amplifier topologies are of ___________ typesOneTwoThreeFourHintThe feedback amplifier topologies are of four types they are voltage series, voltage shunt, current series, and current shunt Read more about Feedback Amplifier 99). In how many ways can we connect the feedback signal?OneTwoThreeFourHintIn four ways we can connect the feedback signal in voltage series and shunt, and in current series and shunt 100). In ___________ feedback current or voltage is applied to decrease the amplifier inputPositiveNegativeBoth a and bNone of the aboveHintIn negative feedback current or voltage is applied to decrease the amplifier input Time is Up!