MCQOPTIONS
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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.
| 51. |
_The final stage of a multistage amplifier uses ___________$? |
| A. | RC coupling |
| B. | Transformer coupling |
| C. | Direct coupling |
| D. | Impedance coupling |
| Answer» C. Direct coupling | |
| 52. |
_The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?$? |
| A. | 2 W |
| B. | 6 W |
| C. | 68 W |
| D. | None of the above |
| Answer» D. None of the above | |
| 53. |
_1 db corresponds to ___________ change in voltage or current level$? |
| A. | 40% |
| B. | 80% |
| C. | 20% |
| D. | 25% |
| Answer» B. 80% | |
| 54. |
_RC coupling is used for ___________ amplification$? |
| A. | Voltage |
| B. | Current |
| C. | Power |
| D. | None of the above |
| Answer» B. Current | |
| 55. |
_A current amplification of 2000 is a gain of ___________$? |
| A. | 3 db |
| B. | 66 db |
| C. | 20 db |
| D. | 200 db |
| Answer» C. 20 db | |
| 56. |
RC coupling is not used to amplify extremely low frequencies because$? |
| 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 | |
| 57. |
Transformer coupling is generally employed when load resistance is$? |
| A. | Large |
| B. | Very large |
| C. | Small |
| D. | None of the above |
| Answer» D. None of the above | |
| 58. |
The best frequency response is of ___________ coupling$? |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | None of the above |
| Answer» D. None of the above | |
| 59. |
When a multistage amplifier is to amplify d.c. signal, then one must use coupling$? |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | None of the above |
| Answer» D. None of the above | |
| 60. |
An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?$? |
| A. | 8 db |
| B. | 6 db |
| C. | 5 db |
| D. | 4 db |
| Answer» B. 6 db | |
| 61. |
The ear is not sensitive to ___________$? |
| A. | Frequency distortion |
| B. | Amplitude distortion |
| C. | Frequency as well as amplitude distortion |
| D. | None of the above |
| Answer» B. Amplitude distortion | |
| 62. |
A radio receiver has ___________ of amplification$? |
| A. | One stage |
| B. | Two stages |
| C. | Three stages |
| D. | More than one stages |
| Answer» E. | |
| 63. |
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 | |
| 64. |
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 | |
| 65. |
An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?? |
| A. | 8 db |
| B. | 6 db |
| C. | 5 db |
| D. | 4 db |
| Answer» B. 6 db | |
| 66. |
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 | |
| 67. |
The best frequency response is of ___________ coupling? |
| A. | RC |
| B. | Transformer |
| C. | Direct |
| D. | None of the above |
| Answer» D. None of the above | |
| 68. |
A radio receiver has ___________ of amplification? |
| A. | One stage |
| B. | Two stages |
| C. | Three stages |
| D. | More than one stages |
| Answer» E. | |
| 69. |
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 | |
| 70. |
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 | |
| 71. |
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. | |
| 72. |
1 db corresponds to ___________ change in power level |
| A. | 50% |
| B. | 35% |
| C. | 26% |
| D. | 22% |
| Answer» D. 22% | |
| 73. |
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 | |
| 74. |
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 | |
| 75. |
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 | |
| 76. |
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 | |