Test: Feedback Amplifiers

# Test: Feedback Amplifiers - Electronics and Communication Engineering (ECE)

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## 10 Questions MCQ Test Topicwise Question Bank for Electronics Engineering - Test: Feedback Amplifiers

Test: Feedback Amplifiers for Electronics and Communication Engineering (ECE) 2023 is part of Topicwise Question Bank for Electronics Engineering preparation. The Test: Feedback Amplifiers questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Feedback Amplifiers MCQs are made for Electronics and Communication Engineering (ECE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Feedback Amplifiers below.
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Test: Feedback Amplifiers - Question 1

### When an amplifier is provided with current-shunt feedback, its

Detailed Solution for Test: Feedback Amplifiers - Question 1

Test: Feedback Amplifiers - Question 2

### An amplifier has an open-loop gain of 1000 and a feedback ratio of 0.04. If the open-loop gain changes by 10% due to temperature, the percentage change in gain of the amplifier with feedback will be

Detailed Solution for Test: Feedback Amplifiers - Question 2

Given,

The percentage changeing a in of the amplifier with feed back is

Test: Feedback Amplifiers - Question 3

### A voltage-series negative feedback amplifier has a voltage gain without feedback of A = 500, input resistance R( = 3 kΩ and feedback ratio p = 0.01. The voltage gain Af and input resistance Rtf of the amplifier with feedback are respectively

Detailed Solution for Test: Feedback Amplifiers - Question 3

For a voltage-series negative feedback amplifier, input resistance with negative feedback is

Test: Feedback Amplifiers - Question 4

Assertion (A): The emitter follower inherently exhibits 100% negative feedback.
Reason (R): The emitter follower is an example of voltage-series feedback.

Detailed Solution for Test: Feedback Amplifiers - Question 4

The emitter follower inherently exhibits 100% negative feedback because the voltage at the emitter follows the input voltage. Reason is also a correct statement since the emitter follower simultaneously increases input resistance and decreases output resistance. Hence, both assertion and reason are correct but reason is not the correct explanation of assertion.

Test: Feedback Amplifiers - Question 5

For the emitter follower circuit shown below, match List-l with List-ll and select the correct answer using the codes given below the lists:

List-I
A.    Voltage gain (AV)
B.    input resistance (Ri)
C.    Current gain (Ai)
D.    Output resistance (without feedback)

Test: Feedback Amplifiers - Question 6

An amplifier has a mid-band gain of 125 and a bandwidth of 250 kHz. A 4% negative feedback is introduced to obtain a new bandwidth and gain. If the bandwidth is to be restricted to 1 MHz, the feedback ratio will be

Detailed Solution for Test: Feedback Amplifiers - Question 6

Due to negative feedback, bandwidth becomes

Given, BW = 250 kHz
A = 125, BWf = 1 MHz
Let β’ be the feedback ratio required to restrict the bandwidth to 1 MHz.

Test: Feedback Amplifiers - Question 7

An amplifier has voltage gain with feedback of 100. If the gain without feedback changes by 20% and the gain with feedback should not vary more than 2%, the values of open loop gain and feedback ratio will be respectively given by

Detailed Solution for Test: Feedback Amplifiers - Question 7

We know that,

or,

or,

Also, gain with feedback is

Test: Feedback Amplifiers - Question 8

Match List-l (Type of negative feedback) with List-II (Common names) and select the correct answer using the codes given below the lists:
List-l
A. Voltage-shunt feedback
B. Current-series feedback
C. Voltage-series feedback
D. Current-shunt feedback
List-ll
1. Trans-conductance amplifier
2. Current amplifier
3. Trans-resistance amplifier
4. Voltage amplifier

Test: Feedback Amplifiers - Question 9

Negative feedback enhances all performance parameters of an amplifier except its

Detailed Solution for Test: Feedback Amplifiers - Question 9

Due to negative feedback, gain of the amplifier is reduced
i.e.

Test: Feedback Amplifiers - Question 10

Shunt mixing is generally easy to identify because it

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