MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Microwave Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Advantage of HJT over BJT is that it has: |
| A. | higher gain |
| B. | high frequency of operation |
| C. | sophisticated construction |
| D. | none of the mentioned |
| Answer» C. sophisticated construction | |
| 2. |
Hetero junction bipolar transistors have the same working principle and operation as that of a BJT. |
| A. | true |
| B. | false |
| Answer» C. | |
| 3. |
If a transistor has a short circuit current gain of 25 and the capacitance measured in the hybrid- model of the transistor was 60 pF. Then the threshold frequency of operation of the transistor is: |
| A. | 60 MHz |
| B. | 45.6 GHz |
| C. | 66.3 GHz |
| D. | 34.8 GHz |
| Answer» D. 34.8 GHz | |
| 4. |
The current gain of a BJT ________ with frequency. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 5. |
The output collector to emitter current of a BJT amplifier is independent of the input base current of the amplifier. |
| A. | true |
| B. | false |
| Answer» C. | |
| 6. |
Short circuit current gain of BJT is given by the expression: |
| A. | g<sub>m</sub>/ C |
| B. | C/ g<sub>m</sub> |
| C. | g<sub>m</sub>/C |
| D. | none of the mentioned |
| Answer» B. C/ g<sub>m</sub> | |
| 7. |
If a common emitter configuration BJT is treated as a two port network, the gain of the amplifier is roughly given by the S parameter: |
| A. | S<sub>11</sub> |
| B. | S<sub>12</sub> |
| C. | S<sub>21</sub> |
| D. | S<sub>22</sub> |
| Answer» D. S<sub>22</sub> | |
| 8. |
If the S11 and S22 parameters of a common emitter operated BJT is high: |
| A. | then the output and input ports are matched well |
| B. | there is mismatch in the ports |
| C. | the gain of the amplifier is high |
| D. | none of the mentioned |
| Answer» C. the gain of the amplifier is high | |
| 9. |
The hybrid- model of a BJT is useful for analysis at all frequency ranges and variation of other transistor parameters. |
| A. | true |
| B. | false |
| Answer» B. false | |