## Multiple Choice Questions and Answers on Multistage Transistor Amplifiers

**Q1. A radio receiver has …………… of amplification**

- One stage
- Two stages
- Three stages
- More than one stages

**Answer : 4**

**Q2. RC coupling is used for ………………. amplification**

- Voltage
- Current
- Power
- None of the above

**Answer : 1**

**Q3. In an RC coupled amplifier, the voltage gain over mid-frequency range …………….**

- Changes abruptly with frequency
- Is constant
- Changes uniformly with frequency
- None of the above

**Answer : 2**

**Q4. In obtaining the frequency response curve of an amplifier, the …………**

- Amplifier level output is kept constant
- Amplifier frequency is held constant
- Generator frequency is held constant
- Generator output level is held constant

**Answer : 4**

**Q5. An advantage of RC coupling scheme is the ………….**

- Good impedance matching
- Economy
- High efficiency
- None of the above

**Answer : 2**

**Q6. The best frequency response is of ………. coupling**

- RC
- Transformer
- Direct
- None of the above

**Answer : 3**

**Q7. Transformer coupling is used for ………….. amplification**

- Power
- Voltage
- Current
- None of the above

**Answer : 1**

**Q8. In an RC coupling scheme, the coupling capacitor C _{C} must be large enough ………..**

- To pass d.c. between the stages
- Not to attenuate the low frequencies
- To dissipate high power
- None of the above

**Answer : 2**

**Q9. In RC coupling, the value of coupling capacitor is about ……….**

- 100 pF
- 0.1 µF
- 0.01 µF
- 10 µF

**Answer : 4**

**Q10. The noise factor of an ideal amplifier expressed in db is …………..**

- 0
- 1
- 1
- 10

**Answer : 1**

**Q11. When a multistage amplifier is to amplify d.c. signal, then one must use …….. coupling**

- RC
- Transformer
- Direct
- None of the above

**Answer : 3**

**Q12. ………….. coupling provides the maximum voltage gain**

- RC
- Transformer
- Direct
- Impedance

**Answer : 2**

**Q13. In practice, voltage gain is expressed ……………**

- In db
- In volts
- As a number
- None of the above

**Answer : 1**

**Q14. Transformer coupling provides high efficiency because …………**

- Collector voltage is stepped up
- c. resistance is low
- collector voltage is stepped down
- none of the above

**Answer : 2**

**Q15. Transformer coupling is generally employed when load resistance is ………**

- Large
- Very large
- Small
- None of the above

**Answer : 3**

**Q16. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ……….**

- 600 db
- 24 db
- 14 db
- 27 db

**Answer : 4**

**Q17. The final stage of a multistage amplifier uses ………………**

- RC coupling
- Transformer coupling
- Direct coupling
- Impedance coupling

**Answer : 2**

**Q18. The ear is not sensitive to ………….**

- Frequency distortion
- Amplitude distortion
- Frequency as well as amplitude distortion
- None of the above

**Answer : 1**

**Q19. RC coupling is not used to amplify extremely low frequencies because ………**

- There is considerable power loss
- There is hum in the output
- Electrical size of coupling capacitor becomes very large
- None of the above

**Answer : 3**

**Q20. In transistor amplifiers, we use ……………. transformer for impedance matching**

- Step up
- Step down
- Same turn ratio
- None of the above

**Answer : 2**

**Q21. The lower and upper cut off frequencies are also called ………………… frequencies**

- Sideband
- Resonant
- Half-resonant
- Half-power

**Answer : 4**

**Q22. A gain of 1,000,000 times in power is expressed by …………….**

- 30 db
- 60 db
- 120 db
- 600 db

**Answer : 2**

**Q23. A gain of 1000 times in voltage is expressed by …………..**

- 60 db
- 30 db
- 120 db
- 600 db

**Answer : 1**

**Q24. 1 db corresponds to ………….. change in power level**

- 50%
- 35%
- 26%
- 22%

**Answer : 3**

**Q25. 1 db corresponds to …………. change in voltage or current level**

- 40%
- 80%
- 20%
- 25%

**Answer : 1**

**Q26. The frequency response of transformer coupling is ………….**

- Good
- Very good
- Excellent
- Poor

**Answer : 4**

**Q27. In the initial stages of a multistage amplifier, we use ………..**

- RC coupling
- Transformer coupling
- Direct coupling
- None of the above

**Answer : 1**

**Q28. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to …………**

- Power loss in the coupling device
- Loading effect of the next stage
- The use of many transistors
- The use of many capacitors

**Answer : 2**

**Q29. The gain of an amplifier is expressed in db because ………..**

- It is a simple unit
- Calculations become easy
- Human ear response is logarithmic
- None of the above

**Answer : 3**

**Q30. If the power level of an amplifier reduces to half, the db gain will fall by …….**

- 5 db
- 2 db
- 10 db
- 3 db

**Answer : 4**

**Q31. A current amplification of 2000 is a gain of …………….**

- 3 db
- 66 db
- 20 db
- 200 db

**Answer : 2**

**Q32. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?**

- 8 db
- 6 db
- 5 db
- 4 db

**Answer : 1**

**Q33. The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?**

- 2 W
- 6 W
- 68 W
- None of the above

**Answer : 3**

**Q34. The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?**

- 5 mV
- 2 mV
- 8 mV
- 5 mV

**Answer : 4**

**Q35. RC coupling is generally confined to low power applications because of ………**

- Large value of coupling capacitor
- Low efficiency
- Large number of components
- None of the above

**Answer : 2**

**Q36. The number of stages that can be directly coupled is limited because ……..**

- Changes in temperature cause thermal instability
- Circuit becomes heavy and costly
- It becomes difficult to bias the circuit
- None of the above

**Answer : 1**

**Q37. The purpose of RC or transformer coupling is to …………**

- Block a.c.
- Separate bias of one stage from another
- Increase thermal stability
- None of the above

**Answer : 2**

**Q38. The upper or lower cut off frequency is also called ………….. frequency**

- Resonant
- Sideband
- 3 db
- None of the above

**Answer : 3**

**Q39. The bandwidth of a single stage amplifier is …………. that of a multistage amplifier**

- More than
- The same as
- Less than
- Data insufficient

**Answer : 1**

**Q40. The value of emitter capacitor CE in a multistage amplifier is about ……..**

- 1 µF
- 100 pF
- 0.01 µF
- 50 µF

**Answer : 4**