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

Question 1. Emitter follower is a ___________ circuit

Voltage feedback
Current feedback
Both voltage and current feedback
None of the above

Explanation:-

Answer: Option A. -> Voltage feedback

Question 2. A feedback circuit usually employs ___________ network

Resistive
Capacitive
Inductive
None of the above

Explanation:-

Answer: Option A. -> Resistive

Question 3. 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 4. An emitter follower has ___________ input impedance

Zero
Low
High
None of the above

Explanation:-

Answer: Option C. -> High

Question 5. 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 6. When voltage feedback (negative) is applied to an amplifier, its input impedance ___________

Is decreased
Is increased
Remains the same
None of the above

Explanation:-

Answer: Option B. -> Is increased

Question 7. When current feedback (negative) is applied to an amplifier, its input impedance ___________

Is decreased
Is increased
Remains the same
None of the above

Explanation:-

Answer: Option A. -> Is decreased

Question 8. 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

Question 9. Negative feedback is employed in ___________

Oscillators
Rectifiers
Amplifiers
None of the above

Explanation:-

Answer: Option C. -> Amplifiers

Question 10. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately___________

500
100
1000
5000

Explanation:-

Answer: Option B. -> 100