MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
Transformer coupling is used for__________amplification? |
| A. | Power |
| B. | Voltage |
| C. | Current |
| D. | None of the above |
| Answer» B. Voltage | |
| 3. |
Transformer coupling provides high efficiency because___________? |
| A. | Collector voltage is stepped up |
| B. | resistance is low |
| C. | collector voltage is stepped down |
| D. | none of the above |
| Answer» C. collector voltage is stepped down | |
| 4. |
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 | |
| 5. |
The value of emitter capacitor CE in a multistage amplifier is about____________? |
| A. | 1 µF |
| B. | 100 pF |
| C. | 0.01 µF |
| D. | 50 µF |
| Answer» E. | |
| 6. |
The upper or lower cut off frequency is also called______________frequency? |
| A. | Resonant |
| B. | Sideband |
| C. | 3 db |
| D. | None of the above |
| Answer» D. None of the above | |
| 7. |
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 | |
| 8. |
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 | |
| 9. |
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 | |
| 10. |
The noise factor of an ideal amplifier expressed in db is_____________? |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» B. 1 | |
| 11. |
The lower and upper cut off frequencies are also called_____________frequencies? |
| A. | Sideband |
| B. | Resonant |
| C. | Half-resonant |
| D. | Half-power |
| Answer» E. | |
| 12. |
The gain of an amplifier is expressed in db because_____________? |
| A. | It is a simple unit |
| B. | Calculations become easy |
| C. | Human ear response is logarithmic |
| D. | None of the above |
| Answer» D. None of the above | |
| 13. |
The frequency response of transformer coupling is___________? |
| A. | Good |
| B. | Very good |
| C. | Excellent |
| D. | Poor |
| Answer» E. | |
| 14. |
The final stage of a multistage amplifier uses______________? |
| A. | RC coupling |
| B. | Transformer coupling |
| C. | Direct coupling |
| D. | Impedance coupling |
| Answer» C. Direct coupling | |
| 15. |
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 | |
| 16. |
The best frequency response is of_____________coupling? |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | None of the above |
| Answer» D. None of the above | |
| 17. |
The bandwidth of a single stage amplifier is_____________that of a multistage amplifier? |
| A. | More than |
| B. | The same as |
| C. | Less than |
| D. | Data insufficient |
| Answer» B. The same as | |
| 18. |
RC coupling is used for_____________amplification? |
| A. | Voltage |
| B. | Current |
| C. | Power |
| D. | None of the above |
| Answer» B. Current | |
| 19. |
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 | |
| 20. |
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 | |
| 21. |
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 | |
| 22. |
In the initial stages of a multistage amplifier, we use______________? |
| A. | RC coupling |
| B. | Transformer coupling |
| C. | Direct coupling |
| D. | None of the above |
| Answer» B. Transformer coupling | |
| 23. |
In RC coupling, the value of coupling capacitor is about_______________? |
| A. | 100 pF |
| B. | 0.1 µF |
| C. | 0.01 µF |
| D. | 10 µF |
| Answer» E. | |
| 24. |
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 | |
| 25. |
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. | |
| 26. |
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 | |
| 27. |
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 | |
| 28. |
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. | |
| 29. |
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. | |
| 30. |
_____________coupling provides the maximum voltage gain? |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | Impedance |
| Answer» C. Direct | |
| 31. |
An advantage of RC coupling scheme is the___________? |
| A. | Good impedance matching |
| B. | Economy |
| C. | High efficiency |
| D. | None of the above |
| Answer» C. High efficiency | |
| 32. |
A radio receiver has____________of amplification? |
| A. | One stage |
| B. | Two stages |
| C. | Three stages |
| D. | More than one stages |
| Answer» E. | |
| 33. |
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 | |
| 34. |
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 | |
| 35. |
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 | |