MCQOPTIONS
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MCQOPTIONS
This section includes 161 Mcqs, each offering curated multiple-choice questions to sharpen your Microwave Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The advantage of microwave lower frequency signals are: |
| A. | Increased bandwidth |
| B. | Ability to use high gain, directivity antenna |
| C. | Greater secrecy |
| D. | All of the above |
| Answer» E. | |
| 152. |
The noise produced in a microwave tube due to random nature of emission and electron flow is called: |
| A. | Partition noise |
| B. | Shot noise |
| C. | Johnson noise |
| D. | Shannon noise |
| Answer» C. Johnson noise | |
| 153. |
The modes in a reflex klystron: |
| A. | Give the same frequency but different transit times |
| B. | Result from excessive transit time across the resonator gap |
| C. | Are caused by spurious frequency modulation |
| D. | Are just for theoretical considerations |
| Answer» B. Result from excessive transit time across the resonator gap | |
| 154. |
The transmit time in the repeller space of a reflex klystron must be: |
| A. | n cycles |
| B. | <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td rowspan="2">n + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td rowspan="2">cycles</td></tr><tr><td style="text-align: center;">4</td></tr></table> |
| C. | <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td rowspan="2">n + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td rowspan="2">cycles</td></tr><tr><td style="text-align: center;">4</td></tr></table> |
| D. | <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td rowspan="2">n + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td rowspan="2">cycles</td></tr><tr><td style="text-align: center;">2</td></tr></table> |
| Answer» D. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td rowspan="2">n + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td rowspan="2">cycles</td></tr><tr><td style="text-align: center;">2</td></tr></table> | |
| 155. |
A reflex klystron functions as: |
| A. | Microwave oscillator |
| B. | Microwave amplifier |
| C. | Both as microwave amplifier and oscillator |
| D. | A high gain cavity |
| Answer» B. Microwave amplifier | |
| 156. |
Multicavity klystron: |
| A. | Is not a microwave device |
| B. | In not a good low level amplifier because of noise |
| C. | Is not suited for pulse operation |
| D. | Has a high repeller voltage to ensure small transit time |
| Answer» C. Is not suited for pulse operation | |
| 157. |
Dither-tuned magnetrons: |
| A. | Can be easily jammed |
| B. | Can send pulses on one frequency only |
| C. | Operates on a fixed frequency |
| D. | May be conventional or coaxial |
| Answer» C. Operates on a fixed frequency | |
| 158. |
For handling large microwave power, the best medium is: |
| A. | Coaxial line |
| B. | Rectangular wave guide |
| C. | Stripline |
| D. | Circular wave guide |
| Answer» C. Stripline | |
| 159. |
Due to curvature of earth, microwave repeaters are placed at distance of about: |
| A. | 10 km |
| B. | 50 km |
| C. | 150 km |
| D. | 250 km |
| Answer» C. 150 km | |
| 160. |
Microwave frequency range extends from: |
| A. | 3 MHz to 30 MHz |
| B. | 30 MHz to 300 MHz |
| C. | 300 MHz to 3000 MHz |
| D. | 500 MHz to 30,000 MHz |
| Answer» E. | |
| 161. |
Which of the following noise becomes important at microwave frequencies? |
| A. | Short noise |
| B. | Flicker noise |
| C. | Thermal noise |
| D. | Transit time noise |
| Answer» E. | |