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 ___________ High Low Zero Very high HintAn emitter follower output impedance is low2). The emitter follower voltage gain is approximately equal to _________ One Two Three Four HintThe emitter follower voltage gain is approximately equal to one3). If both input and output is voltage then the amplifier is called ________ Voltage amplifier Current amplifier Transconductance None of the above HintIf both input and output is voltage then the amplifier is called a voltage amplifier4). If both input and output is current then the amplifier is called ________ Voltage amplifier Current amplifier Transconductance None of the above HintIf both input and output is current then the amplifier is called a current amplifier5). The output current divided by input voltage is known as _______ Voltage amplifier Current amplifier Transconductance None of the above HintThe output current divided by input voltage is known as transconductance6). The negative feedback friction value is always less than _________ One Two Three Four HintThe negative feedback friction value is always less than one7). The emitter follower input impedance is ________ High Low Very low Medium HintThe emitter follower input impedance is high8). _________ are the applications of negative feedback amplifier Electronic amplifier and large bandwidth amplifiers Regulated power supplies Both a and b None of the above HintThe regulated power supplies, electronic amplifier, and large bandwidth amplifier, etc are the applications of negative feedback amplifier 9). The negative feedback circuits are of ___________ types One Two Three Four HintThe negative feedback circuits are of two types they are negative voltage feedback and negative current feedback10). The negative voltage feedback categorized into __________ types One Two Three Four HintThe negative voltage feedback categorized into two types they are voltage series feedback and voltage shunt feedback11). The negative current feedback categorized into __________ types One Two Three Four HintThe negative current feedback categorized into two types they are current series feedback and current shunt feedback12). The shunt driven series fed also called _____________ series Voltage Current Both a and b None of the above HintThe shunt driven series fed also called voltage series 13). The shunt driven shunt fed also called _____________ Voltage shunt Current shunt Current series None of the above HintThe shunt driven shunt fed also called voltage shunt14). The series driven series fed also called _____________ Voltage shunt Current shunt Current series Voltage series HintThe series driven series fed also called current series15). The series driven shunt fed also called _____________ Voltage shunt Current shunt Current series Voltage series HintThe series driven shunt fed also called current shed 16). How many types of feedbacks are there? One Two Three Four HintThere are two types of feedbacks they are positive and negative feedback17). Which feedback increases the gain of the amplifier? Positive Negative Both a and b None of the above HintThe positive feedback increases the gain of the amplifier18). ___________ are the disadvantages of positive feedback Instability Increasing distortion All of the above HintInstability, increasing distortion, instability are the disadvantages of positive feedback19). ___________ are the disadvantages of positive feedback Increase in input impedance Decrease in output impedance Reduction in noise All of the above HintAn increase in input impedance, decrease in output impedance, reduction in noise, are the disadvantages of positive feedback20). How many parts does the feedback amplifier consist of? One Two Three Four HintThe feedback amplifier consists of two parts they are feedback circuit and amplifier21). The gain of the amplifier is defined as a ratio of ___________ Output voltage/input voltage Input voltage/output voltage Output voltage/input current None of the above HintThe gain of the amplifier is defined as a ratio of output voltage divided by input voltage22). In series-shunt connection the forward-path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn series-shunt connection, the forward-path gain is the voltage gain23). In series-shunt connection the reverse-path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn series-shunt connection the reverse-path gain is the voltage gain24). In shunt-series connection the revers- path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn shunt-series connection the reverse-path gain is the current gain25). In shunt-series connection the forward-path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn shunt-series connection the forward-path gain is the current gainAmplifier with Negative Feedback MCQ’s with Answers26). Which feedback reduces the amplifier gain? Positive Negative Both a and b None of the above HintThe negative feedback reduces the amplifier gain27). In series -series connection the forward-path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn series -series connection the forward-path gain is a trans-conductance28). In series -series connection the reverse-path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn series -series connection the reverse-path gain is a trans-impedance29). In shunt- shunt connection the reverse-path gain is __________ Voltage gain Current gain Transconductance Transimpedance HintIn shunt-shunt connection the reverse-path gain is trans-conductance30). In shunt- shunt connection the forward-path gain is __________ Voltage gain Current gain Trans-conductance Trans-impedance HintIn shunt - shunt connection the forward-path gain is trans-impedance31). The negative feedback _________ Reduces gain Increases linearly Both a and b None of the above HintThe negative feedback reduces gain and increases linearly32). The realistic op-amp has finite ____________ Input and output impedance Finite gain Both a and b None of the above HintThe realistic op-amp has finite input and output impedance and finite gain33). The voltmeters have __________ input resistance Infinite Finite Zero None of the above HintThe voltmeters have an infinite input resistance34). The amperometers have __________ input resistance Infinite Finite Zero None of the above HintThe amperometers have zero input resistance35). ____________ connection increases the input impedance Series-series Series-shunt Shunt-shunt Shunt-series HintThe series-shunt connection increases the input impedance36). ____________ connection decreases the input impedance Series-series Series-shunt Shunt-shunt Both b and c HintThe both series-shunt and shunt-shunt connections decrease the input impedance37). ____________ connection decreases both input and output impedance Series-series Series-shunt Shunt-shunt Both b and c HintThe shunt-shunt connection decreases both input and output impedance38). ____________ connection increases both input and output impedance Series-series Series-shunt Shunt-shunt Both b and c HintThe series-series connection increases both input and output impedance39). The voltage amplifier is a ________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source None of the above HintThe voltage amplifier is a voltage-controlled voltage source40). The current amplifier is a ________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source Current controlled current source HintThe current amplifier is a current-controlled current source41). The transconductance amplifier is a ____________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source Current controlled current source HintThe transconductance amplifier is a voltage-controlled current source42). The trans-impedance amplifier is a ____________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source Current controlled current source HintThe trans-impedance amplifier is a current-controlled voltage source43). The voltage amplifier uses _______ feedback Series-series Series-shunt Shunt-shunt Both b and c HintThe voltage amplifier uses series-shunt feedback44). The current amplifier uses _______ feedback Series-series Series-shunt Shunt-shunt Shunt-series HintThe current amplifier uses shunt-series feedback45). The trans-conductance amplifier uses _______ feedback Series-series Series-shunt Shunt-shunt Shunt-series HintThe trans-conductance amplifier uses series-series feedback46). The trans-impedance amplifier uses __________ feedback Series-series Series-shunt Shunt-shunt Shunt-series HintThe trans-impedance amplifier uses shunt-shunt feedback47). _________ feedback used in amplifiers Positive Negative Both a and b None of the above HintThe negative feedback used in amplifiers48). The bandwidth increased in __________ feedback Positive Negative Both a and b None of the above HintThe bandwidth increased in negative feedback49). __________ feedback reduces the distortion Positive Negative Both a and b None of the above HintThe negative feedback reduces the distortion50). __________ feedback increases the amplifier stability Positive Negative Both a and b None of the above HintThe negative feedback increases the amplifier stabilityAmplifier with Negative Feedback MCQ’s for Quiz51). The ratio of output power divided by input power is known as ___________ gain Voltage Current Power None of the above HintThe ratio of output power divided by input power is known as power gain52). The ratio of output current divided by input current is known as ___________ gain Voltage Current Power None of the above HintThe ratio of output current divided by input current is known as current gainThe ratio of output current divided by input current is known as current gain Voltage Current Power None of the above HintThe ratio of output voltage divided by input voltage is known as voltage gain54). The emitter follower has _____ High current gain High power gain Both a and b None of the above HintThe emitter follower has high current gain and high power gain55). The voltage gain is ________ in the source follower FET amplifier One Zero Finite Infinite HintThe voltage gain is zero in the source follower FET amplifier56). The current gain is ________ in the source follower FET amplifier Low High Very low Medium HintThe current gain is high in the source follower FET amplifier57). The power gain is ________ in the source follower FET amplifier Low High Very low Medium HintThe power gain is medium in the source follower FET amplifier58). The input resistance is _________ in the source follower FET amplifier Low High Very high Very low HintThe input resistance is very high in the source follower FET amplifier59). The output resistance is _________ in the source follower FET amplifier Low High Very high Very low HintThe output resistance is low in the source follower FET amplifier60). The input /output phase relationship is ________ in the source follower FET amplifier 0 degrees 180 degrees 360 degrees 90 degrees HintThe input /output phase relationship is zero degrees in the source follower FET amplifier61). ________ feedback decreases the noise Voltage series and voltage shunt Current series and current shunt Both a and b None of the above HintThe voltage series, voltage shunt, current series, and current shunt feedbacks decreases the noise62). ________ feedback decreases the harmonic distortion Voltage series and voltage shunt Current series and current shunt Both a and b None of the above HintThe voltage series, voltage shunt, current series, and current shunt feedback decreases the harmonic distortion63). ________ feedback increases the bandwidth Voltage series and voltage shunt Current series and current shunt Both a and b None of the above HintThe voltage series, voltage shunt, current series, and current shunt feedback increases the bandwidth64). What is the feedback signal in voltage series topology? Voltage Current Both a and b None of the above HintIn the voltage series topology voltage is the feedback signal65). What is the feedback signal in the current series topology? Voltage Current Both a and b None of the above HintIn the current series topology current is the feedback signal66). What is the sample signal in the current series topology? Voltage Current Both a and b None of the above HintIn the current series topology current is the sample signal67). What is the sample signal in the current shunt topology? Voltage Current Both a and b None of the above HintIn current shunt topology current is the sample signal68). What is the sample signal in voltage series topology? Voltage Current Both a and b None of the above HintIn voltage series topology voltage is the sample signal69). What is the sample signal in voltage shunt topology? Voltage Current Both a and b None of the above HintIn voltage shunt topology voltage is the sample signal70). The positive feedback is also called as ____________ Current series Voltage series Regenerative Degenerative HintThe positive feedback is also called regenerative71). The negative feedback is also called as ____________ Current series Voltage series Regenerative Degenerative HintThe negative feedback is also called degenerative72). The stability is ____________ in positive feedback Less High Very high Medium HintThe stability is less in positive feedback73). The stability is ____________ in negative feedback Better High Very high Comparatively more HintThe stability is comparatively more in negative feedback74). In the positive feedback, the feedback is taken from _____________ terminal of the op-amp Non-inverting Inverting Either a or b None of the above HintIn the positive feedback, the feedback is taken from a non-inverting terminal of the op-amp75). In the negative feedback, the feedback is taken from _____________ terminal of the op-amp Non-inverting Inverting Either a or b None of the above HintIn the negative feedback, the feedback is taken from an inverting terminal of the op-ampAmplifier with Negative Feedback MCQ’s for Students76). The sensitivity is ________ in the positive feedback Low High Very high Better HintThe sensitivity is low in the positive feedback77). The sensitivity is ________ in the negative feedback Low High Very high Better HintThe sensitivity is high in the negative feedback78). The phase shift in positive feedback is ___________ 0 degrees 180 degrees 360 degrees 0 or 360 degrees HintThe phase shift in positive feedback is 0 or 360 degrees79). The phase shift in negative feedback is ___________ 0 degrees 180 degrees 360 degrees 0 or 360 degrees HintThe phase shift in negative feedback is 180 degrees80). ___________ feedback requires external interruption Positive Negative Both a and b None of the above HintThe positive feedback requires external interruption81). The output resistance value decreases for _________ Voltage series Voltage shunt Both a and b None of the above HintThe output resistance value decreases for both voltage series and voltage shunt82). The input resistance for the voltage amplifier should be ___________ One Zero Infinite None of the above HintThe input resistance for the voltage amplifier should be infinite83). The output resistance for the voltage amplifier should be ___________ One Zero Infinite None of the above HintThe output resistance for the voltage amplifier should be zero84). The input resistance for the current amplifier should be ___________ Less High Very high None of the above HintThe input resistance for the current amplifier should be less85). The output resistance for the current amplifier should be ___________ Less High Very less None of the above HintThe output resistance for the current amplifier should be high86). Both input and output resistance are high in __________ amplifier Trans-conductance Voltage Current None of the above HintBoth input and output resistance is high in trans-conductance amplifier87). Both input and output resistance are less in __________ amplifier Trans-conductance Voltage Current Trans-resistance HintBoth input and output resistance are less in the trans-resistance amplifier88). In the current series negative feedback, current indicates __________ Sampling Mixing Both a and b None of the above HintIn the current series negative feedback, the current indicates the sampling89). In the current series negative feedback, series indicates __________ Sampling Mixing Both a and b None of the above HintIn the current series negative feedback, series indicates mixing90). In __________ amplifier the output is an exact replica of an input signal Ideal Practical Both a and b None of the above HintIn an ideal amplifier, the output is an exact replica of an input signal91). __________ amplifier will not amplify the mid-frequency region equally Ideal Practical Both a and b None of the above HintThe practical amplifier will not amplify the mid-frequency region equallyRead more about Amplifier92). The practical amplifier will not amplify the mid-frequency region equally due to ____________ Non-linearity Temperature effect Parameter variation All of the above HintThe practical amplifier will not amplify the mid-frequency region equally due to non-linearity, temperature effect, and parameter variation93). In negative feedback, both input and output are __________ Out of phase In-phase Both a and b None of the above HintIn negative feedback, both input and output are out of phase94). In positive feedback both input and output are __________ Out of phase In-phase Both a and b None of the above HintIn positive feedback both input and output are in phase95). __________ are the voltage sampling Voltage series and voltage shunt Current series and current shunt Both a and b None of the above HintThe voltage series and voltage shunt are the voltage samplings96). __________ are the current sampling Voltage series and voltage shunt Current series and current shunt Both a and b None of the above HintThe current series and current shunt are the current samplings97). The feedback system consists of _________ blocks One Two Three Four HintThe feedback system consists of four blocks they are amplifier, sampling network, feedback network, and mixing network98). The feedback amplifier topologies are of ___________ types One Two Three Four HintThe feedback amplifier topologies are of four types they are voltage series, voltage shunt, current series, and current shunt Read more about Feedback Amplifier99). In how many ways can we connect the feedback signal? One Two Three Four HintIn four ways we can connect the feedback signal in voltage series and shunt, and in current series and shunt100). In ___________ feedback current or voltage is applied to decrease the amplifier input Positive Negative Both a and b None of the above HintIn negative feedback current or voltage is applied to decrease the amplifier input Time is Up! Time's up