MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 76 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db? |
| A. | db |
| B. | db |
| C. | db |
| D. | db |
| Answer» B. db | |
| 2. |
When a multistage amplifier is to amplify d.c. signal, then one must usecoupling |
| A. | C |
| B. | ransformer |
| C. | irect |
| D. | one of the above |
| Answer» D. one of the above | |
| 3. |
In practice, voltage gain is expressed ___________ |
| A. | In db |
| B. | In volts |
| C. | As a number |
| D. | None of the above |
| Answer» B. In volts | |
| 4. |
The total gain of a multistage amplifier is less than the product of the gains of individual stages due to ___________ |
| A. | Power loss in the coupling device |
| B. | Loading effect of the next stage |
| C. | The use of many transistors |
| D. | The use of many capacitors |
| Answer» C. The use of many transistors | |
| 5. |
In transistor amplifiers, we use ___________ transformer for impedance matching |
| A. | Step up |
| B. | Step down |
| C. | Same turn ratio |
| D. | None of the above |
| Answer» C. Same turn ratio | |
| 6. |
The frequency response of transformer coupling is ___________ |
| A. | Good |
| B. | Very good |
| C. | Excellent |
| D. | Poor |
| Answer» E. | |
| 7. |
The purpose of RC or transformer coupling is to ___________ |
| A. | Block a.c. |
| B. | Separate bias of one stage from another |
| C. | Increase thermal stability |
| D. | None of the above |
| Answer» C. Increase thermal stability | |
| 8. |
Transformer coupling is generally employed when load resistance is |
| A. | Large |
| B. | Very large |
| C. | Small |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
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? |
| A. | 5 mV |
| B. | 2 mV |
| C. | 8 mV |
| D. | 5 mV |
| Answer» E. | |
| 10. |
___________ coupling provides the maximum voltage gain |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | Impedance |
| Answer» C. Direct | |
| 11. |
RC coupling is generally confined to low power applications because of |
| A. | Large value of coupling capacitor |
| B. | Low efficiency |
| C. | Large number of components |
| D. | None of the above |
| Answer» C. Large number of components | |
| 12. |
The ear is not sensitive to ___________ |
| A. | Frequency distortion |
| B. | Amplitude distortion |
| C. | Frequency as well as amplitude distortion |
| D. | None of the above |
| Answer» B. Amplitude distortion | |
| 13. |
If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ___________ |
| A. | 600 db |
| B. | 24 db |
| C. | 14 db |
| D. | 27 db |
| Answer» E. | |
| 14. |
In obtaining the frequency response curve of an amplifier, the ___________ |
| A. | Amplifier level output is kept constant |
| B. | Amplifier frequency is held constant |
| C. | Generator frequency is held constant |
| D. | Generator output level is held constant |
| Answer» E. | |
| 15. |
The final stage of a multistage amplifier uses ___________ |
| A. | RC coupling |
| B. | Transformer coupling |
| C. | Direct coupling |
| D. | Impedance coupling |
| Answer» C. Direct coupling | |
| 16. |
A gain of 1000 times in voltage is expressed by ___________ |
| A. | 60 db |
| B. | 30 db |
| C. | 120 db |
| D. | 600 db |
| Answer» B. 30 db | |
| 17. |
A gain of 1,000,000 times in power is expressed by ___________ |
| A. | 30 db |
| B. | 60 db |
| C. | 120 db |
| D. | 600 db |
| Answer» C. 120 db | |
| 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 ? |
| A. | 2 W |
| B. | 6 W |
| C. | 68 W |
| D. | None of the above |
| Answer» D. None of the above | |
| 19. |
When a multistage amplifier is to amplify d.c. signal, then one must use coupling |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | None of the above |
| Answer» D. None of the above | |
| 20. |
In an RC coupling scheme, the coupling capacitor CC must be large enough ___________ |
| A. | To pass d.c. between the stages |
| B. | Not to attenuate the low frequencies |
| C. | To dissipate high power |
| D. | None of the above |
| Answer» C. To dissipate high power | |
| 21. |
In an RC coupled amplifier, the voltage gain over mid-frequency range ___________ |
| A. | Changes abruptly with frequency |
| B. | Is constant |
| C. | Changes uniformly with frequency |
| D. | None of the above |
| Answer» C. Changes uniformly with frequency | |
| 22. |
1 db corresponds to ___________ change in voltage or current level |
| A. | 40% |
| B. | 80% |
| C. | 20% |
| D. | 25% |
| Answer» B. 80% | |
| 23. |
The best frequency response is of ___________ coupling |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | None of the above |
| Answer» D. None of the above | |
| 24. |
The lower and upper cut off frequencies are also called ___________ frequencies |
| A. | Sideband |
| B. | Resonant |
| C. | Half-resonant |
| D. | Half-power |
| Answer» E. | |
| 25. |
Transformer coupling is used for ___________ amplification |
| A. | Power |
| B. | Voltage |
| C. | Current |
| D. | None of the above |
| Answer» B. Voltage | |
| 26. |
RC coupling is used for ___________ amplification |
| A. | Voltage |
| B. | Current |
| C. | Power |
| D. | None of the above |
| Answer» B. Current | |
| 27. |
A radio receiver has ___________ of amplification |
| A. | One stage |
| B. | Two stages |
| C. | Three stages |
| D. | More than one stages |
| Answer» E. | |
| 28. |
The number of stages that can be directly coupled is limited because |
| A. | Changes in temperature cause thermal instability |
| B. | Circuit becomes heavy and costly |
| C. | It becomes difficult to bias the circuit |
| D. | None of the above |
| Answer» B. Circuit becomes heavy and costly | |
| 29. |
If the power level of an amplifier reduces to half, the db gain will fall by . |
| A. | 5 db |
| B. | 2 db |
| C. | 10 db |
| D. | 3 db |
| Answer» E. | |
| 30. |
A current amplification of 2000 is a gain of ___________ |
| A. | 3 db |
| B. | 66 db |
| C. | 20 db |
| D. | 200 db |
| Answer» C. 20 db | |
| 31. |
RC coupling is not used to amplify extremely low frequencies because |
| A. | There is considerable power loss |
| B. | There is hum in the output |
| C. | Electrical size of coupling capacitor becomes very large |
| D. | None of the above |
| Answer» D. None of the above | |
| 32. |
In practice, voltage gain is expressed ___________~! |
| A. | In db |
| B. | In volts |
| C. | As a number |
| D. | None of the above |
| Answer» B. In volts | |
| 33. |
The total gain of a multistage amplifier is less than the product of the gains of individual stages due to ___________~! |
| A. | Power loss in the coupling device |
| B. | Loading effect of the next stage |
| C. | The use of many transistors |
| D. | The use of many capacitors |
| Answer» C. The use of many transistors | |
| 34. |
The number of stages that can be directly coupled is limited because%! |
| A. | Changes in temperature cause thermal instability |
| B. | Circuit becomes heavy and costly |
| C. | It becomes difficult to bias the circuit |
| D. | None of the above |
| Answer» B. Circuit becomes heavy and costly | |
| 35. |
*$_In transistor amplifiers, we use ___________ transformer for impedance matching? |
| A. | Step up |
| B. | Step down |
| C. | Same turn ratio |
| D. | None of the above |
| Answer» C. Same turn ratio | |
| 36. |
*$_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?? |
| A. | 5 mV |
| B. | 2 mV |
| C. | 8 mV |
| D. | 5 mV |
| Answer» E. | |
| 37. |
*$_If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ___________? |
| A. | 600 db |
| B. | 24 db |
| C. | 14 db |
| D. | 27 db |
| Answer» E. | |
| 38. |
*$_A gain of 1000 times in voltage is expressed by ___________? |
| A. | 60 db |
| B. | 30 db |
| C. | 120 db |
| D. | 600 db |
| Answer» B. 30 db | |
| 39. |
*$_In an RC coupling scheme, the coupling capacitor CC must be large enough ___________? |
| A. | To pass d.c. between the stages |
| B. | Not to attenuate the low frequencies |
| C. | To dissipate high power |
| D. | None of the above |
| Answer» C. To dissipate high power | |
| 40. |
*$_The lower and upper cut off frequencies are also called ___________ frequencies? |
| A. | Sideband |
| B. | Resonant |
| C. | Half-resonant |
| D. | Half-power |
| Answer» E. | |
| 41. |
*$_The number of stages that can be directly coupled is limited because? |
| A. | Changes in temperature cause thermal instability |
| B. | Circuit becomes heavy and costly |
| C. | It becomes difficult to bias the circuit |
| D. | None of the above |
| Answer» B. Circuit becomes heavy and costly | |
| 42. |
%_The frequency response of transformer coupling is ____________% |
| A. | Good |
| B. | Very good |
| C. | Excellent |
| D. | Poor |
| Answer» E. | |
| 43. |
%____________ coupling provides the maximum voltage gain_% |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | Impedance |
| Answer» C. Direct | |
| 44. |
%_In obtaining the frequency response curve of an amplifier, the ____________% |
| A. | Amplifier level output is kept constant |
| B. | Amplifier frequency is held constant |
| C. | Generator frequency is held constant |
| D. | Generator output level is held constant |
| Answer» E. | |
| 45. |
%_A gain of 1,000,000 times in power is expressed by ____________% |
| A. | 30 db |
| B. | 60 db |
| C. | 120 db |
| D. | 600 db |
| Answer» C. 120 db | |
| 46. |
%_In an RC coupled amplifier, the voltage gain over mid-frequency range ____________% |
| A. | Changes abruptly with frequency |
| B. | Is constant |
| C. | Changes uniformly with frequency |
| D. | None of the above |
| Answer» C. Changes uniformly with frequency | |
| 47. |
%_Transformer coupling is used for ___________ amplification_% |
| A. | Power |
| B. | Voltage |
| C. | Current |
| D. | None of the above |
| Answer» B. Voltage | |
| 48. |
_ If the power level of an amplifier reduces to half, the db gain will fall by .$? |
| A. | 5 db |
| B. | 2 db |
| C. | 10 db |
| D. | 3 db |
| Answer» E. | |
| 49. |
_The purpose of RC or transformer coupling is to ___________$? |
| A. | Block a.c. |
| B. | Separate bias of one stage from another |
| C. | Increase thermal stability |
| D. | None of the above |
| Answer» C. Increase thermal stability | |
| 50. |
_RC coupling is generally confined to low power applications because of$? |
| A. | Large value of coupling capacitor |
| B. | Low efficiency |
| C. | Large number of components |
| D. | None of the above |
| Answer» C. Large number of components | |