MCQOPTIONS
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MCQOPTIONS
This section includes 73 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. |
_ It is generally desired that a transistor should have ___________ input impedance$? |
| A. | Low |
| B. | Very low |
| C. | High |
| D. | Very high |
| Answer» D. Very high | |
| 52. |
_An amplifier has a power gain of 100. Its db gain is ___________$? |
| A. | 10 db |
| B. | 20 db |
| C. | 40 db |
| D. | None of the above |
| Answer» C. 40 db | |
| 53. |
If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is$? |
| A. | 165 |
| B. | 165 x 104 |
| C. | 100 |
| D. | None of the above |
| Answer» B. 165 x 104 | |
| 54. |
In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________$? |
| A. | Short |
| B. | Open |
| C. | Partially open |
| D. | None of the above |
| Answer» B. Open | |
| 55. |
If the input capacitor of a transistor amplifier is short-circuited, then$? |
| A. | Transistor will be destroyed |
| B. | Biasing conditions will change |
| C. | Signal will not reach the base |
| D. | None of the above |
| Answer» C. Signal will not reach the base | |
| 56. |
The value of collector load RC in a transistor amplifier is ___________ the output impedance of the transistor.$? |
| A. | The same as |
| B. | Less than |
| C. | More than |
| D. | None of the above |
| Answer» C. More than | |
| 57. |
In a CE amplifier, voltage gain = ___________ x RAC/Rin$? |
| A. | α |
| B. | (1 + α) |
| C. | (1+ β) |
| D. | β |
| Answer» E. | |
| 58. |
If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is$? |
| A. | RL + RC |
| B. | RC || RL |
| C. | RL - RC |
| D. | RC |
| Answer» C. RL - RC | |
| 59. |
A transistor amplifier has high output impedance because ___________$? |
| A. | Emitter is heavily doped |
| B. | Collector has reverse bias |
| C. | Collector is wider than emitter or base |
| D. | None of the above |
| Answer» C. Collector is wider than emitter or base | |
| 60. |
A transistor amplifier has high output impedance because ___________? |
| A. | Emitter is heavily doped |
| B. | Collector has reverse bias |
| C. | Collector is wider than emitter or base |
| D. | None of the above |
| Answer» C. Collector is wider than emitter or base | |
| 61. |
The radio wave picked up by the receiving antenna is amplified about times to have reasonable sound output |
| A. | 1000 |
| B. | A million |
| C. | 100 |
| D. | 10000 |
| Answer» C. 100 | |
| 62. |
In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________ |
| A. | Short |
| B. | Open |
| C. | Partially short |
| D. | None of the above |
| Answer» C. Partially short | |
| 63. |
The purpose of a coupling capacitor in a transistor amplifier is to ___________ |
| A. | Increase the output impedance of transistor |
| B. | Protect the transistor |
| C. | Pass a.c. and block d.c. |
| D. | Provide biasing |
| Answer» D. Provide biasing | |
| 64. |
If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ___________ |
| A. | 20 kΩ |
| B. | 2 kΩ |
| C. | 10 kΩ |
| D. | 5 kΩ |
| Answer» E. | |
| 65. |
The input capacitor in an amplifier is the ___________ capacitor |
| A. | Coupling |
| B. | Bypass |
| C. | Leakage |
| D. | None of the above |
| Answer» B. Bypass | |
| 66. |
If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be ___________ |
| A. | High |
| B. | Very high |
| C. | Moderate |
| D. | Low |
| Answer» E. | |
| 67. |
A CE amplifier is also called ___________ circuit |
| A. | Grounded emitter |
| B. | Grounded base |
| C. | Grounded collector |
| D. | None of the above |
| Answer» B. Grounded base | |
| 68. |
The point of intersection of d.c. and a.c. load lines is called ___________ |
| A. | Saturation point |
| B. | Cut off point |
| C. | Operating point |
| D. | None of the above |
| Answer» D. None of the above | |
| 69. |
In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is ___________ |
| A. | 180° |
| B. | 270° |
| C. | 90° |
| D. | 0° |
| Answer» E. | |
| 70. |
The purpose of capacitors in a transistor amplifier is to ___________ |
| A. | Protect the transistor |
| B. | Cool the transistor |
| C. | Couple or bypass a.c. component |
| D. | Provide biasing |
| Answer» D. Provide biasing | |
| 71. |
CC configuration is used for impedance matching because its ___________ |
| A. | Input impedance is very high |
| B. | Input impedance is low |
| C. | Output impedance is very low |
| D. | None of the above |
| Answer» B. Input impedance is low | |
| 72. |
In transistor amplifiers, we generally use ___________ capacitors. |
| A. | Electrolytic |
| B. | Mica |
| C. | Paper |
| D. | Air |
| Answer» B. Mica | |
| 73. |
The d.c. load of a transistor amplifier is generally ___________ that of a a.c. load |
| A. | The same as |
| B. | Less than |
| C. | More than |
| D. | None of the above |
| Answer» D. None of the above | |