Multiple Choice Questions and Answers on Amplifiers with Negative Feedback
Multiple Choice Questions and Answers on Amplifiers with Negative Feedback
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- Question Bank in Electronics & Communication Engineering by Prem R Chadha
- A Handbook on Electronics Engineering – Illustrated Formulae & Key Theory Concepts
Q1. When negative voltage feedback is applied to an amplifier, its voltage gain ……………….
- Is increased
- Is reduced
- Remains the same
- None of the above
Answer : 2
Q2. The value of negative feedback fraction is always …………….
- Less than 1
- More than 1
- Equal to 1
- None of the above
Answer : 1
Q3. 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
- 01
- 15
Answer : 3
Q4. 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
Answer : 4
Q5. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately………..
- 500
- 100
- 1000
- 5000
Answer : 2
Q6. A feedback circuit usually employs ……………… network
- Resistive
- Capacitive
- Inductive
- None of the above
Answer : 1
Q7. The gain of an amplifier with feedback is known as ………….. gain
- Resonant
- Open loop
- Closed loop
- None of the above
Answer : 3
Q8. When voltage feedback (negative) is applied to an amplifier, its input impedance ………….
- Is decreased
- Is increased
- Remains the same
- None of the above
Answer : 2
Q9. When current feedback (negative) is applied to an amplifier, its input impedance …………..
- Is decreased
- Is increased
- Remains the same
- None of the above
Answer : 1
Q10. Negative feedback is employed in ……………..
- Oscillators
- Rectifiers
- Amplifiers
- None of the above
Answer : 3
Q11. Emitter follower is used for …………
- Current gain
- Impedance matching
- Voltage gain
- None of the above
Answer : 2
Q12. The voltage gain of an emitter follower is ………..
- Much less than 1
- Approximately equal to 1
- Greater than 1
- None of the above
Answer : 2
Q13. When current feedback (negative) is applied to an amplifier, its output impedance ……..
- Is increased
- Is decreased
- Remains the same
- None of the above
Answer : 1
Q14. Emitter follower is a ……………….. circuit
- Voltage feedback
- Current feedback
- Both voltage and current feedback
- None of the above
Answer : 2
Q15. If voltage feedback (negative) is applied to an amplifier, its output impedance …………..
- Remains the same
- Is increased
- Is decreased
- None of the above
Answer : 3
Q16. When a negative voltage feedback is applied to an amplifier, its bandwidth……….
- Is increased
- Is decreased
- Remains the same
- Insufficient data
Answer : 1
Q17. An emitter follower has ………… input impedance
- Zero
- Low
- High
- None of the above
Answer : 3
Q18. This question will be available soon
Q19. The output impedance of an emitter follower is ……….
- High
- Very high
- Almost zero
- Low
Answer : 4
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