Amplifier with Negative Feedback Question & Answers July 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 Hint 2). The emitter follower voltage gain is approximately equal to _________ One Two Three Four Hint 3). If both input and output is voltage then the amplifier is called ________ Voltage amplifier Current amplifier Transconductance None of the above Hint 4). If both input and output is current then the amplifier is called ________ Voltage amplifier Current amplifier Transconductance None of the above Hint 5). The output current divided by input voltage is known as _______ Voltage amplifier Current amplifier Transconductance None of the above Hint 6). The negative feedback friction value is always less than _________ One Two Three Four Hint 7). The emitter follower input impedance is ________ High Low Very low Medium Hint 8). _________ are the applications of negative feedback amplifier Electronic amplifier and large bandwidth amplifiers Regulated power supplies Both a and b None of the above Hint 9). The negative feedback circuits are of ___________ types One Two Three Four Hint 10). The negative voltage feedback categorized into __________ types One Two Three Four Hint 11). The negative current feedback categorized into __________ types One Two Three Four Hint 12). The shunt driven series fed also called _____________ series Voltage Current Both a and b None of the above Hint 13). The shunt driven shunt fed also called _____________ Voltage shunt Current shunt Current series None of the above Hint 14). The series driven series fed also called _____________ Voltage shunt Current shunt Current series Voltage series Hint 15). The series driven shunt fed also called _____________ Voltage shunt Current shunt Current series Voltage series Hint 16). How many types of feedbacks are there? One Two Three Four Hint 17). Which feedback increases the gain of the amplifier? Positive Negative Both a and b None of the above Hint 18). ___________ are the disadvantages of positive feedback Instability Increasing distortion All of the above Hint 19). ___________ are the disadvantages of positive feedback Increase in input impedance Decrease in output impedance Reduction in noise All of the above Hint 20). How many parts does the feedback amplifier consist of? One Two Three Four Hint 21). 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 Hint 22). In series-shunt connection the forward-path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint 23). In series-shunt connection the reverse-path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint 24). In shunt-series connection the revers- path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint 25). In shunt-series connection the forward-path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint Amplifier with Negative Feedback MCQ’s with Answers 26). Which feedback reduces the amplifier gain? Positive Negative Both a and b None of the above Hint 27). In series -series connection the forward-path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint 28). In series -series connection the reverse-path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint 29). In shunt- shunt connection the reverse-path gain is __________ Voltage gain Current gain Transconductance Transimpedance Hint 30). In shunt- shunt connection the forward-path gain is __________ Voltage gain Current gain Trans-conductance Trans-impedance Hint 31). The negative feedback _________ Reduces gain Increases linearly Both a and b None of the above Hint 32). The realistic op-amp has finite ____________ Input and output impedance Finite gain Both a and b None of the above Hint 33). The voltmeters have __________ input resistance Infinite Finite Zero None of the above Hint 34). The amperometers have __________ input resistance Infinite Finite Zero None of the above Hint 35). ____________ connection increases the input impedance Series-series Series-shunt Shunt-shunt Shunt-series Hint 36). ____________ connection decreases the input impedance Series-series Series-shunt Shunt-shunt Both b and c Hint 37). ____________ connection decreases both input and output impedance Series-series Series-shunt Shunt-shunt Both b and c Hint 38). ____________ connection increases both input and output impedance Series-series Series-shunt Shunt-shunt Both b and c Hint 39). The voltage amplifier is a ________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source None of the above Hint 40). The current amplifier is a ________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source Current controlled current source Hint 41). The transconductance amplifier is a ____________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source Current controlled current source Hint 42). The trans-impedance amplifier is a ____________ Voltage controlled voltage source Voltage controlled current source Current controlled voltage source Current controlled current source Hint 43). The voltage amplifier uses _______ feedback Series-series Series-shunt Shunt-shunt Both b and c Hint 44). The current amplifier uses _______ feedback Series-series Series-shunt Shunt-shunt Shunt-series Hint 45). The trans-conductance amplifier uses _______ feedback Series-series Series-shunt Shunt-shunt Shunt-series Hint 46). The trans-impedance amplifier uses __________ feedback Series-series Series-shunt Shunt-shunt Shunt-series Hint 47). _________ feedback used in amplifiers Positive Negative Both a and b None of the above Hint 48). The bandwidth increased in __________ feedback Positive Negative Both a and b None of the above Hint 49). __________ feedback reduces the distortion Positive Negative Both a and b None of the above Hint 50). __________ feedback increases the amplifier stability Positive Negative Both a and b None of the above Hint Amplifier with Negative Feedback MCQ’s for Quiz 51). The ratio of output power divided by input power is known as ___________ gain Voltage Current Power None of the above Hint 52). The ratio of output current divided by input current is known as ___________ gain Voltage Current Power None of the above Hint The ratio of output current divided by input current is known as current gain Voltage Current Power None of the above Hint 54). The emitter follower has _____ High current gain High power gain Both a and b None of the above Hint 55). The voltage gain is ________ in the source follower FET amplifier One Zero Finite Infinite Hint 56). The current gain is ________ in the source follower FET amplifier Low High Very low Medium Hint 57). The power gain is ________ in the source follower FET amplifier Low High Very low Medium Hint 58). The input resistance is _________ in the source follower FET amplifier Low High Very high Very low Hint 59). The output resistance is _________ in the source follower FET amplifier Low High Very high Very low Hint 60). The input /output phase relationship is ________ in the source follower FET amplifier 0 degrees 180 degrees 360 degrees 90 degrees Hint 61). ________ feedback decreases the noise Voltage series and voltage shunt Current series and current shunt Both a and b None of the above Hint 62). ________ feedback decreases the harmonic distortion Voltage series and voltage shunt Current series and current shunt Both a and b None of the above Hint 63). ________ feedback increases the bandwidth Voltage series and voltage shunt Current series and current shunt Both a and b None of the above Hint 64). What is the feedback signal in voltage series topology? Voltage Current Both a and b None of the above Hint 65). What is the feedback signal in the current series topology? Voltage Current Both a and b None of the above Hint 66). What is the sample signal in the current series topology? Voltage Current Both a and b None of the above Hint 67). What is the sample signal in the current shunt topology? Voltage Current Both a and b None of the above Hint 68). What is the sample signal in voltage series topology? Voltage Current Both a and b None of the above Hint 69). What is the sample signal in voltage shunt topology? Voltage Current Both a and b None of the above Hint 70). The positive feedback is also called as ____________ Current series Voltage series Regenerative Degenerative Hint 71). The negative feedback is also called as ____________ Current series Voltage series Regenerative Degenerative Hint 72). The stability is ____________ in positive feedback Less High Very high Medium Hint 73). The stability is ____________ in negative feedback Better High Very high Comparatively more Hint 74). 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 Hint 75). 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 Hint Amplifier with Negative Feedback MCQ’s for Students 76). The sensitivity is ________ in the positive feedback Low High Very high Better Hint 77). The sensitivity is ________ in the negative feedback Low High Very high Better Hint 78). The phase shift in positive feedback is ___________ 0 degrees 180 degrees 360 degrees 0 or 360 degrees Hint 79). The phase shift in negative feedback is ___________ 0 degrees 180 degrees 360 degrees 0 or 360 degrees Hint 80). ___________ feedback requires external interruption Positive Negative Both a and b None of the above Hint 81). The output resistance value decreases for _________ Voltage series Voltage shunt Both a and b None of the above Hint 82). The input resistance for the voltage amplifier should be ___________ One Zero Infinite None of the above Hint 83). The output resistance for the voltage amplifier should be ___________ One Zero Infinite None of the above Hint 84). The input resistance for the current amplifier should be ___________ Less High Very high None of the above Hint 85). The output resistance for the current amplifier should be ___________ Less High Very less None of the above Hint 86). Both input and output resistance are high in __________ amplifier Trans-conductance Voltage Current None of the above Hint 87). Both input and output resistance are less in __________ amplifier Trans-conductance Voltage Current Trans-resistance Hint 88). In the current series negative feedback, current indicates __________ Sampling Mixing Both a and b None of the above Hint 89). In the current series negative feedback, series indicates __________ Sampling Mixing Both a and b None of the above Hint 90). In __________ amplifier the output is an exact replica of an input signal Ideal Practical Both a and b None of the above Hint 91). __________ amplifier will not amplify the mid-frequency region equally Ideal Practical Both a and b None of the above Hint Read more about Amplifier 92). The practical amplifier will not amplify the mid-frequency region equally due to ____________ Non-linearity Temperature effect Parameter variation All of the above Hint 93). In negative feedback, both input and output are __________ Out of phase In-phase Both a and b None of the above Hint 94). In positive feedback both input and output are __________ Out of phase In-phase Both a and b None of the above Hint 95). __________ are the voltage sampling Voltage series and voltage shunt Current series and current shunt Both a and b None of the above Hint 96). __________ are the current sampling Voltage series and voltage shunt Current series and current shunt Both a and b None of the above Hint 97). The feedback system consists of _________ blocks One Two Three Four Hint 98). The feedback amplifier topologies are of ___________ types One Two Three Four Hint Read more about Feedback Amplifier 99). In how many ways can we connect the feedback signal? One Two Three Four Hint 100). In ___________ feedback current or voltage is applied to decrease the amplifier input Positive Negative Both a and b None of the above Hint Time is Up! Time's up
