Analog Electronics - MCQ on FEEDBACK AMPLIFIER
Multiple Choice Questions and Answers on Feedback Amplifiers - Analog Electronics
1. To obtain very high input and output impedance in a feedback amplifier, the topology mostly used is
a) voltage-series
b) current-series
c) voltage-shunt
d) current-shunt
Answer: b
2. In a feedback amplifier, sensitivity D is equal
to
a a) Aβ
b) 1-Aβ
c) 1+Aβ
d) 1/(Aβ+1)
Answer: c
3. In a negative feedback amplifier, voltage
sampling
a a) tends to decrease the output resistance
b) tends to increase the output resistance7
c) does not alter output resistance
d) produces same effect on output
resistance as current sampling
Answer: a
4. In a negative feedback amplifier, current
sampling
a) tends to decrease the output resistance
b) tends to increase the output resistance
c) does not alter output resistance
d) produces same effect on output
resistance as voltage sampling
Answer: b
5. Open loop gain of a amplifier is given by
a) A
b) Aβ
c) β
d) None of the above
Answer: a
6. Loop gain
is given by
a) A
b) Aβ
c) β
d) None of the above
Answer: b
7. In a negative feedback amplifier, series mixing
a) tends to decrease the input resistance
b) tends to increase the input resistance
c) does not alter input resistance
d) produces same effect on input resistance
as shunt mixing
Answer: b
8. For a shunt-shunt negative feedback amplifier
a) input impedance decrease but output
impedance increases
b) both input impedance and output
impedance increases
c) both input impedance and output
impedance decreases
d) none of the above
Answer: c
9. An amplifier with negative feedback
a) controls the gain
b) reduces the noise
c) reduces phase distortion
d) all of the above
Answer: d
10. In a negative feedback amplifier, shunt mixing
a) tends to decrease the input resistance
b) tends to increase the input resistance
c) does not alter input resistance
d) produces same effect on input resistance
as series mixing
Answer: a
11. Negative feedback in an amplifier improves
a) signal to noise ratio at the output
b) reduces distortion
c) both (a) and (b)
d) none of the above
Answer: c
12. Barkhausen criterion is:
b) negative feedback, Aβ=1, θ=0 or multiple 360
c) positive feedback, Aβ=0, θ=0 or multiple 360
d) negative feedback, Aβ=1, θ= 360
Answer: a
13. Negative feedback in an amplifier
a) increases voltage gain
b) decreases voltage gain
c) stabilizes voltage gain
d) both b and c are correct
Answer: d
14. Input impedance of an amplifier can be increased
from 2Kohms to 250Kohms by introducing
a) shunt current negative feedback
b) shunt voltage negative feedback
c) series current negative feedback
d) none of these
Answer: c
15. The voltage between the input terminals of an
ideal OPAMP is
a) zero
b) very small
c) very large
c) equal to te input voltage
Answer: a
16. One of the effects of negative feedback in
amplifier is to
a) increase the noise
b) decrease the harmonic distortion
c) increase the voltage gain
d) decrease the bandwidth
Answer: b
17. An emitter follower circuit is widely used in
electric instruments because
a) its voltage gain is very high
b) its voltage gain is less than 1
c) input impedance is high and output impedance
is low
d) it employees no bypass capacitor
Answer: c
18. When OPAMP is not saturated, the voltages at the
non invertiong and inverting inputs are
b) much different
c) equal to the output voltage
d) equal to -15V
Answer: a
19. Open loop voltage gain equals the
a) gain with negative feedback
b) differential voltage gain of OPAMP
c) Gain when B is 1
d) gain at unity
Answer: b
20. The voltage between the input terminals of a
real OPAMP is
a) 0
b) very small
c) very large
d) equal to input voltage
Answer: b
21. Transresistance of an amplifier is the ratio of
its
a) o/p current ti i/p voltage
b) i/p voltage to o/p current
c) o/p voltage to i/p voltage
d) o/p voltage to i/p current
Answer: d
22. The input impedance of a current – to – voltage
converter is
a) small
b) large
c) ideally zero
d) ideally infinitre
Answer: c
23. Negative feedback reduces the
a) feedback fraction
b) distortion
c) input offset voltage
d) loop gain
Answer: b
24. Voltage follower has a loop gain of
a) much less than 1
b) 1
c) more than 1
d) A
Answer: b
25. Negative feedback does not improve
a) stability of voltage gain
b) non linear distortion in later stages
c) output offset voltage
d) power bandwidth
Answer: d
Hope this post on "Analog Electronics - MCQ on FEEDBACK AMPLIFIER" will help Electronics Engineering and Electrical Engineering students in preparation of technical interviews, GATE, IES etc.
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