Feedback Configurations Block Diagram MCQ [Free PDF] – Objective Question Answer for Feedback Configurations Block Diagram Quiz

1. A feedback amplifier is also called as

A. Open-loop amplifier
B. Closed-loop amplifier
C. Feedback network amplifier
D. Looped network amplifier

Answer: B

A feedback amplifier is sometimes referred to as a closed-loop amplifier because the feedback forms a closed loop between input and output.


2. How many types of configurations are available for feedback amplifiers?

A. Six
B. Four
C. Two
D. Eight

Answer: B

There are four types of configuration available. They are voltage series feedback, voltage shunt feedback, Current series feedback, and Current shunt feedback.


3. Which of the following is not a feedback configuration?

A. Current-series feedback
B. Voltage-shunt feedback
C. Current-Voltage feedback
C. Current-Shunt feedback

Answer: C

In a feedback amplifier, either current or voltage can be fed back to the input, but both current and voltage cannot be feedback simultaneously.


4. When load current flows into the feedback circuit, the configuration is said to be

A. Current-shunt feedback
B. Voltage-shunt feedback
C. Voltage-series feedback
D. All of the mentioned

Answer: B

In the current-series and current-shunt feedback circuit, the load current flows into the feedback circuit.


6. On what criteria does the feedback amplifier are classified?

A. Signal fed back to the input
B. Signal applied to an input
C. Signal fed back to an output
D. None of the mentioned

Answer: D

The feedback amplifiers are classified according to whether the voltage or current is fed back to the input in series or parallel.


7. The closed-loop voltage gain is reciprocal of

A. Voltage gain of an op-amp
B. Gain of the feedback circuit
C. Open loop voltage gain
D. None of the mentioned

Answer: B

Comparing the equation of closed loop voltage gain (AF) and the gain of the feedback circuit (B.. AF is reciprocal of B

=> AF = 1+( RF/ R1) ; B= R1/( R1+ RF)

=> B = 1+( R1/ RF)

Therefore, AF = 1/B.


8. Select the specifications that implies the inverting amplifier?

A. V1 = -3v, V2 = -4v
B. V1 = -2v, V2 = 3v
C. V1 = 5v, V 2 = 15v
D. V1 = 0v, V2 = 5v

Answer: D

In inverting amplifier, the input is applied to the inverting terminal and the non-inverting terminal is grounded. So,the input applied to inverting amplifier can be V1 = 0v, V2 = 5v.


9. Specify the voltage gain of a non-inverting amplifier with feedback amplifier with and without feedback?

A. A= Vo/Vid, AF = Vf/Vo
B. A= Vf/Vid, AF= Vo/Vf
C. A= Vo/Vid, AF= Vo/Vin
D. A= Vf/Vid, AF = Vf/Vin

Answer: C

The voltage gain of an op-amp with feedback is the open-loop voltage gain, A=Vo /Vid. The voltage gain of op-amp without feedback is the closed-loop voltage gain, AF = Vo /Vin.


10. If the feedback voltage and the output voltage are given as 10v and 4v. Find the gain of the feedback circuit in the voltage-series feedback amplifier?

A. 2.5v
B. 40v
C. 3v
D. 6.2v

Answer: A

Gain of feedback

feedback voltage = 10 V

output voltage = 4V

B = Vf /Vo

= 10v/4v = 2.5v.

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