MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Microwave Engineering Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a transistor amplifier, if the input impedance is -84-j1.9 Ω, then the terminating impedance required to create enough instability is: |
| A. | -84-j1.9 Ω |
| B. | 28+j1.9 Ω |
| C. | – (28+j1.9) Ω |
| D. | None of the mentioned |
| Answer» C. – (28+j1.9) Ω | |
| 2. |
In transistor oscillators, FET and BJT are used. Instability is achieved by: |
| A. | Giving a negative feedback |
| B. | Giving a positive feedback |
| C. | Using a tank circuit |
| D. | None of the mentioned |
| Answer» C. Using a tank circuit | |
| 3. |
In transistor oscillators, the requirement of a negative resistance device is satisfied using a varactor diode. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
To achieve stable oscillation, Zin + ZL=0 is the only necessary and sufficient condition to be satisfied by the microwave oscillator. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
If the input impedance of a diode used in the microwave oscillator is 45-j23 Ω, then the load impedance is to achieve stable oscillation is: |
| A. | 45-j23 Ω |
| B. | -45+j23 Ω |
| C. | 50 Ω |
| D. | 23-j45 Ω |
| Answer» C. 50 Ω | |
| 6. |
A one port oscillator uses a negative resistance diode having Гin=0.9575+j0.8034 (Z0=50Ω) at its desired frequency point. Then the input impedance of the diode is: |
| A. | -44+j123 |
| B. | 50+j100 |
| C. | -44+j145 |
| D. | None of the mentioned |
| Answer» B. 50+j100 | |
| 7. |
In a microwave oscillator, a load of 50+50j is connected across a negative resistance device of impedance -50-50j. Steady state oscillation is not achieved in the oscillator. |
| A. | True |
| B. | False |
| Answer» C. | |