MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
By performing the K-∆ test for a given transistor the values of K and ∆ were found to be equal to 0.383 and 0.334 respectively. The transistor with these parameters has unconditional stability. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
If the S parameters of a transistor given areS11=-0.811-j0.311S12= 0.0306+j0.0048S21=2.06+j3.717S22=-0.230-j0.4517Then ∆ for the given transistor is: |
| A. | 0.336 |
| B. | 0.383 |
| C. | 0.456 |
| D. | None of the mentioned |
| Answer» B. 0.383 | |
| 3. |
The condition for unconditional stability of a transistor as per the K-∆ test is │∆│> 1 and K<1. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
For any passive source termination ГS, Unconditional stability implies that: |
| A. | │Гout│<1 |
| B. | │Гout│>1 |
| C. | │Гin│<1 |
| D. | │Гin│>1 |
| Answer» B. │Гout│>1 | |
| 5. |
If │S11│>1 or │S22│>1, the amplifier cannot be unconditionally stable. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
By_performing_the_K-∆_test_for_a_given_transistor_the_values_of_K_and_∆_were_found_to_be_equal_to_0.383_and_0.334_respectively._The_transistor_with_these_parameters_has_unconditional_stability.$# |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The condition for unconditional stability of a transistor as per the K-∆ test is │∆│> 1 and K<1?# |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
For any passive source termination –ìS, Unconditional stability implies that:$ |
| A. | │Гout│<1 |
| B. | │Гout│>1 |
| C. | │Гin│<1 |
| D. | │Гin│>1 |
| Answer» B. ‚Äö√Ñ√∂‚àö√Ü‚àö√°‚Äö√Ñ√¨‚àö¬®out‚Äö√Ñ√∂‚àö√Ü‚àö√°>1 | |
| 9. |
If │S11│>1 or │S22│>1, the amplifier cannot be unconditionally stable.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
For a unilateral device condition for unconditional stability in terms of S parameters is: |
| A. | │S<sub>11</sub>│<1, │S<sub>22</sub>│<1 |
| B. | │S<sub>11</sub>│>1, │S<sub>22</sub>│>1 |
| C. | │S<sub>11</sub>│>1, │S<sub>22</sub>│<1 |
| D. | │S<sub>11</sub>│<1, │S<sub>22</sub>│>1 |
| Answer» B. ‚Äö√Ñ√∂‚àö√Ü‚àö√°S<sub>11</sub>‚Äö√Ñ√∂‚àö√Ü‚àö√°>1, ‚Äö√Ñ√∂‚àö√Ü‚àö√°S<sub>22</sub>‚Äö√Ñ√∂‚àö√Ü‚àö√°>1 | |
| 11. |
Stability condition of an amplifier is frequency independent and hence can be operated at any frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
A network is said to be conditionally stable if: |
| A. | │Гin│<1, │Гout│<1. |
| B. | │Гin│>1, │Гout│>1 |
| C. | │Гin│>1, │Гout│<1 |
| D. | │Гin│<1, │Гout│>1 |
| Answer» B. ‚Äö√Ñ√∂‚àö√Ü‚àö√°‚Äö√Ñ√¨‚àö¬®in‚Äö√Ñ√∂‚àö√Ü‚àö√°>1, ‚Äö√Ñ√∂‚àö√Ü‚àö√°‚Äö√Ñ√¨‚àö¬®out‚Äö√Ñ√∂‚àö√Ü‚àö√°>1 | |
| 13. |
____________ condition, if met then the transistor can be impedance matched for any load. |
| A. | Conditional stability |
| B. | Unconditional stability |
| C. | Infinite gain |
| D. | Infinite input impedance |
| Answer» C. Infinite gain | |
| 14. |
For a transistor amplifier to be stable, either the input or the output impedance must have a real negative part. |
| A. | True |
| B. | False |
| Answer» B. False | |