multi stage transistor amplifiers Mcqs
1. In RC coupling, the value of coupling capacitor is about_______________?
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A. 10 F

B. 100 pF

C. 0.01 F

D. 0.1 F

2. In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
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A. None of the above

B. Is constant

C. Changes abruptly with frequency

D. Changes uniformly with frequency

3. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?
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A. 4 db

B. 8 db

C. 6 db

D. 5 db

4. A current amplification of 2000 is a gain of_________________?
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A. 200 db

B. 3 db

C. 66 db

D. 20 db

5. The noise factor of an ideal amplifier expressed in db is_____________?
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A. 1

B. 1

C. 10

D. 0
6. A gain of 1,000,000 times in power is expressed by_____________?
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A. 600 db

B. 120 db

C. 30 db

D. 60 db
7. The number of stages that can be directly coupled is limited because___________?
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A. None of the above

B. Changes in temperature cause thermal instability

C. Circuit becomes heavy and costly

D. It becomes difficult to bias the circuit

8. In the initial stages of a multistage amplifier, we use______________?
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A. None of the above

B. RC coupling

C. Direct coupling

D. Transformer coupling

9. Transformer coupling provides high efficiency because___________?
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A. resistance is low

B. none of the above

C. Collector voltage is stepped up

D. collector voltage is stepped down

10. 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?
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A. 2 mV

B. 8 mV

C. 5 mV

D. 5 mV
11. RC coupling is not used to amplify extremely low frequencies because____________?
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A. Electrical size of coupling capacitor becomes very large

B. There is considerable power loss

C. None of the above

D. There is hum in the output

12. The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?
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A. Data insufficient

B. The same as

C. Less than

D. More than
13. The value of emitter capacitor CE in a multistage amplifier is about____________?
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A. 50 F

B. 1 F

C. 100 pF

D. 0.01 F

14. A gain of 1000 times in voltage is expressed by_______________?
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A. 120 db

B. 600 db

C. 30 db

D. 60 db
15. RC coupling is used for_____________amplification?
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A. Power

B. Voltage

C. Current

D. None of the above

16. In practice, voltage gain is expressed______________?
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A. None of the above

B. In db

C. In volts

D. As a number

17. In transistor amplifiers, we use_____________transformer for impedance matching?
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A. e of the above

B. Same turn ratio

C. Step down

D. Step up

18. 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 ?
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A. 6 W

B. 68 W

C. 2 W

D. None of the above

19. The upper or lower cut off frequency is also called______________frequency?
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A. 3 db

B. Sideband

C. None of the above

D. Resonant

20. The ear is not sensitive to___________?
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A. Amplitude distortion

B. Frequency distortion

C. e of the above

D. Frequency as well as amplitude distortion

21. The purpose of RC or transformer coupling is to_____________?
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A. e of the above

B. Increase thermal stability

C. Block a.c.

D. Separate bias of one stage from another
22. RC coupling is generally confined to low power applications because of____________?
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A. Large number of components

B. None of the above

C. Low efficiency

D. Large value of coupling capacitor

23. An advantage of RC coupling scheme is the___________?
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A. High efficiency

B. Economy

C. None of the above

D. Good impedance matching

24. 1 db corresponds to_____________change in power level?
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A. 35%

B. 22%

C. 50%

D. 26%
25. In obtaining the frequency response curve of an amplifier, the______________?
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A. Generator output level is held constant

B. Generator frequency is held constant

C. Amplifier frequency is held constant

D. Amplifier level output is kept constant

26. When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?
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A. Transformer

B. RC

C. None of the above

D. Direct
27. The final stage of a multistage amplifier uses______________?
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A. Impedance coupling

B. RC coupling

C. Direct coupling

D. Transformer coupling
28. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?
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A. 14 db

B. 27 db

C. 600 db

D. 24 db

29. If the power level of an amplifier reduces to half, the db gain will fall by___________?
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A. 2 db

B. 10 db

C. 3 db

D. 5 db

30. The lower and upper cut off frequencies are also called_____________frequencies?
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A. Resonant

B. Half-resonant

C. Sideband

D. Half-power
31. The best frequency response is of_____________coupling?
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A. None of the above

B. RC

C. Transformer

D. Direct
32. In an RC coupling scheme, the coupling capacitor CC must be large enough______________?
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A. Not to attenuate the low frequencies

B. To dissipate high power

C. None of the above

D. To pass d.c. between the stages

33. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
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A. use of many capacitors

B. Power loss in the coupling device

C. The use of many transistors

D. Loading effect of the next stage
34. The frequency response of transformer coupling is___________?
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A. Excellent

B. Poor

C. Good

D. Very good

35. A radio receiver has____________of amplification?
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A. Three stages

B. Two stages

C. More than one stages

D. One stage

36. Transformer coupling is used for__________amplification?
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A. Current

B. Power

C. None of the above

D. Voltage

37. 1 db corresponds to_____________change in voltage or current level?
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A. 40%

B. 25%

C. 20%

D. 80%

38. Transformer coupling is generally employed when load resistance is______________?
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A. None of the above

B. Small

C. Very large

D. Large

39. _____________coupling provides the maximum voltage gain?
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A. Transformer

B. Direct

C. Impedance

D. RC

40. The gain of an amplifier is expressed in db because_____________?
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A. Calculations become easy

B. It is a simple unit

C. None of the above

D. Human ear response is logarithmic