## Multiple Choice Questions and Answers on Amplifiers withÂ Negative Feedback

**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**