Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > An amplifier has input impedance of 4 kΩ and ...
Start Learning for Free
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are
- a)40 kΩ and 8 kΩ respectively
- b)4 kΩ and 80 kΩ respectively
- c)0.4 kΩ and 800 kΩ respectively
- d)8 kΩ and 160 kΩ respectively
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ...
Closed loop input impedance = 4 (1 + 0.1 x 90) = 40 kΩ,
Closed loop Output impedance = 
= 8 kΩ.
= 8 kΩ.Most Upvoted Answer
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ...
Input Impedance Calculation:
The closed-loop input impedance is given by the formula Zin = (1 + βA) * Zi, where Zin is the closed-loop input impedance, β is the feedback factor (10% or 0.1 in this case), A is the open-loop gain (90), and Zi is the input impedance of the amplifier (4 kΩ).
Plugging in the values, we get Zin = (1 + 0.1 * 90) * 4 kΩ = 40 kΩ.
Output Impedance Calculation:
The closed-loop output impedance is given by the formula Zout = Zo / (1 + βA), where Zout is the closed-loop output impedance, Zo is the output impedance of the amplifier (80 kΩ), and all other variables have the same values as before.
Plugging in the values, we get Zout = 80 kΩ / (1 + 0.1 * 90) = 8 kΩ.
Therefore, the closed-loop input impedance is 40 kΩ and the closed-loop output impedance is 8 kΩ, which corresponds to option 'A'.
The closed-loop input impedance is given by the formula Zin = (1 + βA) * Zi, where Zin is the closed-loop input impedance, β is the feedback factor (10% or 0.1 in this case), A is the open-loop gain (90), and Zi is the input impedance of the amplifier (4 kΩ).
Plugging in the values, we get Zin = (1 + 0.1 * 90) * 4 kΩ = 40 kΩ.
Output Impedance Calculation:
The closed-loop output impedance is given by the formula Zout = Zo / (1 + βA), where Zout is the closed-loop output impedance, Zo is the output impedance of the amplifier (80 kΩ), and all other variables have the same values as before.
Plugging in the values, we get Zout = 80 kΩ / (1 + 0.1 * 90) = 8 kΩ.
Therefore, the closed-loop input impedance is 40 kΩ and the closed-loop output impedance is 8 kΩ, which corresponds to option 'A'.
Attention Electrical Engineering (EE) Students!
To make sure you are not studying endlessly, EduRev has designed Electrical Engineering (EE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electrical Engineering (EE).
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Similar Electrical Engineering (EE) Doubts
Top Courses for Electrical Engineering (EE)View all
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?
Question Description
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?.
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?.
Solutions for An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances area)40 kΩ and 8 kΩ respectivelyb)4 kΩ and 80 kΩ respectivelyc)0.4 kΩ and 800 kΩ respectivelyd)8 kΩ and 160 kΩ respectivelyCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
|
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup