Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Questions  >  An amplifier has voltage gain with feedback o... Start Learning for Free
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
  • a)
    1000 and 1.9%
  • b)
    10000 and 0.9%
  • c)
    1000 and 0.9%
  • d)
    10000 and 1.9%
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
An amplifier has voltage gain with feedback of 100. If the gain withou...
We know that, 

or,

or, 

Also, gain with feedback is

View all questions of this test
Most Upvoted Answer
An amplifier has voltage gain with feedback of 100. If the gain withou...
Solution:
Given, voltage gain with feedback = 100
Let the open-loop gain be A and feedback ratio be β.

Change in the gain without feedback = 20%
Therefore, the new gain without feedback = (1 + 0.2) A = 1.2A

The gain with feedback should not vary more than 2%
Hence, the new gain with feedback = 100 ± 2 = 102 or 98

Case 1: Gain with feedback = 102
Voltage gain with feedback = Aβ = 100
New voltage gain with feedback = (1 + 0.2)Aβ = 1.2Aβ
Hence, 1.2Aβ = 102
Aβ = 102/1.2 = 85

Case 2: Gain with feedback = 98
Voltage gain with feedback = Aβ = 100
New voltage gain with feedback = (1 + 0.2)Aβ = 1.2Aβ
Hence, 1.2Aβ = 98
Aβ = 98/1.2 = 82

Therefore, the values of open-loop gain and feedback ratio will be respectively given by
A = 1000 and β = 1/110 = 0.9% (Option C)

HTML representation:
Solution:
Given, voltage gain with feedback = 100
Let the open-loop gain be A and feedback ratio be β.

Change in the gain without feedback: 20%
New gain without feedback = (1 + 0.2) A = 1.2A

Gain with feedback should not vary more than 2%
New gain with feedback = 100 ± 2 = 102 or 98

Case 1: Gain with feedback = 102
Voltage gain with feedback = Aβ = 100
New voltage gain with feedback = (1 + 0.2)Aβ = 1.2Aβ
1.2Aβ = 102
Aβ = 102/1.2 = 85

Case 2: Gain with feedback = 98
Voltage gain with feedback = Aβ = 100
New voltage gain with feedback = (1 + 0.2)Aβ = 1.2Aβ
1.2Aβ = 98
Aβ = 98/1.2 = 82

Answer:
The values of open-loop gain and feedback ratio will be respectively given by
A = 1000 and β = 1/110 = 0.9% (Option C)
Attention Electronics and Communication Engineering (ECE) Students!
To make sure you are not studying endlessly, EduRev has designed Electronics and Communication Engineering (ECE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electronics and Communication Engineering (ECE).
Explore Courses for Electronics and Communication Engineering (ECE) exam

Top Courses for Electronics and Communication Engineering (ECE)

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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer?
Question Description
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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer?.
Solutions for 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electronics and Communication Engineering (ECE). Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free.
Here you can find the meaning of 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer?, a detailed solution for 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice 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 bya)1000 and 1.9%b)10000 and 0.9%c)1000 and 0.9%d)10000 and 1.9%Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Electronics and Communication Engineering (ECE) tests.
Explore Courses for Electronics and Communication Engineering (ECE) exam

Top Courses for Electronics and Communication Engineering (ECE)

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev