Amplifiers With Negative Feedback(Engineering > Electrical Engineering ) Questions and Answers
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. An emitter follower has ___________ input impedance
Zero
Low
High
None of the above
Explanation:-
Answer: Option C. -> High
Question 4. 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 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 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 7. If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is ___________
10
1
1
15
Explanation:-
Answer: Option C. -> 1
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. The output impedance of an emitter follower is ___________