Amplifiers With Negative Feedback(Engineering > Electrical Engineering ) Questions and answers for exam Preparation

Question 1. Negative feedback is employed in ___________

Oscillators
Rectifiers
Amplifiers
None of the above

Explanation:-

Answer: Option C. -> Amplifiers

Question 2. A feedback circuit usually employs ___________ network

Resistive
Capacitive
Inductive
None of the above

Explanation:-

Answer: Option A. -> Resistive

Question 3. The gain of an amplifier with feedback is known as ___________ gain

Resonant
Open loop
Closed loop
None of the above

Explanation:-

Answer: Option C. -> Closed loop

Question 4. When a negative voltage feedback is applied to an amplifier, its bandwidth___________

Is increased
Is decreased
Remains the same
Insufficient data

Explanation:-

Answer: Option A. -> Is increased

Question 5. The output impedance of an emitter follower is ___________

High
Very high
Almost zero
Low

Explanation:-

Answer: Option D. -> Low

Question 6. The value of negative feedback fraction is always ___________

Less than 1
More than 1
Equal to 1
None of the above

Explanation:-

Answer: Option A. -> Less than 1

Question 7. When negative voltage feedback is applied to an amplifier, its voltage gain ___________

Is increased
Is reduced
Remains the same
None of the above

Explanation:-

Answer: Option B. -> Is reduced

Question 8. The gain of an amplifier without feedback is 100 db. if a negative feedback of 3 db is applied, the gain of the amplifier will become ___________

5 db
300 db
103 db
97 db

Explanation:-

Answer: Option D. -> 97 db

Question 9. The voltage gain of an emitter follower is ___________

Much less than 1
Approximately equal to 1
Greater than 1
None of the above

Explanation:-

Answer: Option B. -> Approximately equal to 1

Question 10. If voltage feedback (negative) is applied to an amplifier, its output impedance ___________

Remains the same
Is increased
Is decreased
None of the above

Explanation:-

Answer: Option C. -> Is decreased