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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 ___________
HintAn emitter follower output impedance is low
2). The emitter follower voltage gain is approximately equal to _________
HintThe emitter follower voltage gain is approximately equal to one
3). If both input and output is voltage then the amplifier is called ________
HintIf 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 ________
HintIf 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 _______
HintThe output current divided by input voltage is known as transconductance
6). The negative feedback friction value is always less than _________
HintThe negative feedback friction value is always less than one
7). The emitter follower input impedance is ________
HintThe emitter follower input impedance is high
8). _________ are the applications of negative feedback amplifier
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
HintThe negative feedback circuits are of two types they are negative voltage feedback and negative current feedback
10). The negative voltage feedback categorized into __________ types
HintThe negative voltage feedback categorized into two types they are voltage series feedback and voltage shunt feedback
11). The negative current feedback categorized into __________ types
HintThe negative current feedback categorized into two types they are current series feedback and current shunt feedback
12). The shunt driven series fed also called _____________ series
HintThe shunt driven series fed also called voltage series
13). The shunt driven shunt fed also called _____________
HintThe shunt driven shunt fed also called voltage shunt
14). The series driven series fed also called _____________
HintThe series driven series fed also called current series
15). The series driven shunt fed also called _____________
HintThe series driven shunt fed also called current shed
16). How many types of feedbacks are there?
HintThere are two types of feedbacks they are positive and negative feedback
17). Which feedback increases the gain of the amplifier?
HintThe positive feedback increases the gain of the amplifier
18). ___________ are the disadvantages of positive feedback
HintInstability, increasing distortion, instability are the disadvantages of positive feedback
19). ___________ are the disadvantages of positive feedback
HintAn 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?
HintThe feedback amplifier consists of two parts they are feedback circuit and amplifier
21). The gain of the amplifier is defined as a ratio of ___________
HintThe 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 __________
HintIn series-shunt connection, the forward-path gain is the voltage gain
23). In series-shunt connection the reverse-path gain is __________
HintIn series-shunt connection the reverse-path gain is the voltage gain
24). In shunt-series connection the revers- path gain is __________
HintIn shunt-series connection the reverse-path gain is the current gain
25). In shunt-series connection the forward-path gain is __________
HintIn shunt-series connection the forward-path gain is the current gain

Amplifier with Negative Feedback MCQ’s with Answers

26). Which feedback reduces the amplifier gain?
HintThe negative feedback reduces the amplifier gain
27). In series -series connection the forward-path gain is __________
HintIn series -series connection the forward-path gain is a trans-conductance
28). In series -series connection the reverse-path gain is __________
HintIn series -series connection the reverse-path gain is a trans-impedance
29). In shunt- shunt connection the reverse-path gain is __________
HintIn shunt-shunt connection the reverse-path gain is trans-conductance
30). In shunt- shunt connection the forward-path gain is __________
HintIn shunt - shunt connection the forward-path gain is trans-impedance
31). The negative feedback _________
HintThe negative feedback reduces gain and increases linearly
32). The realistic op-amp has finite ____________
HintThe realistic op-amp has finite input and output impedance and finite gain
33). The voltmeters have __________ input resistance
HintThe voltmeters have an infinite input resistance
34). The amperometers have __________ input resistance
HintThe amperometers have zero input resistance
35). ____________ connection increases the input impedance
HintThe series-shunt connection increases the input impedance
36). ____________ connection decreases the input impedance
HintThe both series-shunt and shunt-shunt connections decrease the input impedance
37). ____________ connection decreases both input and output impedance
HintThe shunt-shunt connection decreases both input and output impedance
38). ____________ connection increases both input and output impedance
HintThe series-series connection increases both input and output impedance
39). The voltage amplifier is a ________
HintThe voltage amplifier is a voltage-controlled voltage source
40). The current amplifier is a ________
HintThe current amplifier is a current-controlled current source
41). The transconductance amplifier is a ____________
HintThe transconductance amplifier is a voltage-controlled current source
42). The trans-impedance amplifier is a ____________
HintThe trans-impedance amplifier is a current-controlled voltage source
43). The voltage amplifier uses _______ feedback
HintThe voltage amplifier uses series-shunt feedback
44). The current amplifier uses _______ feedback
HintThe current amplifier uses shunt-series feedback
45). The trans-conductance amplifier uses _______ feedback
HintThe trans-conductance amplifier uses series-series feedback
46). The trans-impedance amplifier uses __________ feedback
HintThe trans-impedance amplifier uses shunt-shunt feedback
47). _________ feedback used in amplifiers
HintThe negative feedback used in amplifiers
48). The bandwidth increased in __________ feedback
HintThe bandwidth increased in negative feedback
49). __________ feedback reduces the distortion
HintThe negative feedback reduces the distortion
50). __________ feedback increases the amplifier stability
HintThe negative feedback increases the amplifier stability

Amplifier with Negative Feedback MCQ’s for Quiz

51). The ratio of output power divided by input power is known as ___________ gain
HintThe 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 ___________ gain
HintThe 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 gain
HintThe ratio of output voltage divided by input voltage is known as voltage gain
54). The emitter follower has _____
HintThe emitter follower has high current gain and high power gain
55). The voltage gain is ________ in the source follower FET amplifier
HintThe voltage gain is zero in the source follower FET amplifier
56). The current gain is ________ in the source follower FET amplifier
HintThe current gain is high in the source follower FET amplifier
57). The power gain is ________ in the source follower FET amplifier
HintThe power gain is medium in the source follower FET amplifier
58). The input resistance is _________ in the source follower FET amplifier
HintThe input resistance is very high in the source follower FET amplifier
59). The output resistance is _________ in the source follower FET amplifier
HintThe output resistance is low in the source follower FET amplifier
60). The input /output phase relationship is ________ in the source follower FET amplifier
HintThe input /output phase relationship is zero degrees in the source follower FET amplifier
61). ________ feedback decreases the noise
HintThe voltage series, voltage shunt, current series, and current shunt feedbacks decreases the noise
62). ________ feedback decreases the harmonic distortion
HintThe voltage series, voltage shunt, current series, and current shunt feedback decreases the harmonic distortion
63). ________ feedback increases the bandwidth
HintThe voltage series, voltage shunt, current series, and current shunt feedback increases the bandwidth
64). What is the feedback signal in voltage series topology?
HintIn the voltage series topology voltage is the feedback signal
65). What is the feedback signal in the current series topology?
HintIn the current series topology current is the feedback signal
66). What is the sample signal in the current series topology?
HintIn the current series topology current is the sample signal
67). What is the sample signal in the current shunt topology?
HintIn current shunt topology current is the sample signal
68). What is the sample signal in voltage series topology?
HintIn voltage series topology voltage is the sample signal
69). What is the sample signal in voltage shunt topology?
HintIn voltage shunt topology voltage is the sample signal
70). The positive feedback is also called as ____________
HintThe positive feedback is also called regenerative
71). The negative feedback is also called as ____________
HintThe negative feedback is also called degenerative
72). The stability is ____________ in positive feedback
HintThe stability is less in positive feedback
73). The stability is ____________ in negative feedback
HintThe stability is comparatively more in negative feedback
74). In the positive feedback, the feedback is taken from _____________ terminal of the op-amp
HintIn 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-amp
HintIn the negative feedback, the feedback is taken from an inverting terminal of the op-amp

Amplifier with Negative Feedback MCQ’s for Students

76). The sensitivity is ________ in the positive feedback
HintThe sensitivity is low in the positive feedback
77). The sensitivity is ________ in the negative feedback
HintThe sensitivity is high in the negative feedback
78). The phase shift in positive feedback is ___________
HintThe phase shift in positive feedback is 0 or 360 degrees
79). The phase shift in negative feedback is ___________
HintThe phase shift in negative feedback is 180 degrees
80). ___________ feedback requires external interruption
HintThe positive feedback requires external interruption
81). The output resistance value decreases for _________
HintThe output resistance value decreases for both voltage series and voltage shunt
82). The input resistance for the voltage amplifier should be ___________
HintThe input resistance for the voltage amplifier should be infinite
83). The output resistance for the voltage amplifier should be ___________
HintThe output resistance for the voltage amplifier should be zero
84). The input resistance for the current amplifier should be ___________
HintThe input resistance for the current amplifier should be less
85). The output resistance for the current amplifier should be ___________
HintThe output resistance for the current amplifier should be high
86). Both input and output resistance are high in __________ amplifier
HintBoth input and output resistance is high in trans-conductance amplifier
87). Both input and output resistance are less in __________ amplifier
HintBoth input and output resistance are less in the trans-resistance amplifier
88). In the current series negative feedback, current indicates __________
HintIn the current series negative feedback, the current indicates the sampling
89). In the current series negative feedback, series indicates __________
HintIn the current series negative feedback, series indicates mixing
90). In __________ amplifier the output is an exact replica of an input signal
HintIn an ideal amplifier, the output is an exact replica of an input signal
91). __________ amplifier will not amplify the mid-frequency region equally
HintThe practical amplifier will not amplify the mid-frequency region equally

Read more about Amplifier

92). The practical amplifier will not amplify the mid-frequency region equally due to ____________
HintThe 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 __________
HintIn negative feedback, both input and output are out of phase
94). In positive feedback both input and output are __________
HintIn positive feedback both input and output are in phase
95). __________ are the voltage sampling
HintThe voltage series and voltage shunt are the voltage samplings
96). __________ are the current sampling
HintThe current series and current shunt are the current samplings
97). The feedback system consists of _________ blocks
HintThe feedback system consists of four blocks they are amplifier, sampling network, feedback network, and mixing network
98). The feedback amplifier topologies are of ___________ types
HintThe 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?
HintIn 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 input
HintIn negative feedback current or voltage is applied to decrease the amplifier input
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