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. |
Low is the G/T ratio of an antenna, higher is its efficiency.a) Trueb) False 10._________ has a constant power spectral density. |
| A. | Trueb) False 10._________ has a constant power spectral density.a) White noise |
| B. | False 10._________ has a constant power spectral density.a) White noiseb) Gaussian noise |
| C. | Thermal noise |
| D. | Shot noiseView Answer |
| Answer» C. Thermal noise | |
| 2. |
If an antenna has a directivity of 16 and is operating at a wavelength of λ, then the maximum effective aperture efficiency is: |
| A. | 1.27λ2 |
| B. | 2.56λ2 |
| C. | 0.87λ2 |
| D. | None of the mentioned |
| Answer» B. 2.56λ2 | |
| 3. |
A rectangular horn antenna has an aperture area of 3λ × 2λ. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is: |
| A. | 19 dB |
| B. | 17.1 dB |
| C. | 13 dB |
| D. | 21.1 dB |
| Answer» C. 13 dB | |
| 4. |
A rectangular horn antenna has an aperture area of 3λ × 2λ. Then the maximum directivity that can be achieved by this rectangular horn antenna is: |
| A. | 24 dB |
| B. | 4 dB |
| C. | 19 dB |
| D. | Insufficient data |
| Answer» D. Insufficient data | |
| 5. |
LOW_IS_THE_G/T_RATIO_OF_AN_ANTENNA,_HIGHER_IS_ITS_EFFICIENCY.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
_________ has a constant power spectral density.$ |
| A. | White noise |
| B. | Gaussian noise |
| C. | Thermal noise |
| D. | Shot noise |
| Answer» B. Gaussian noise | |
| 7. |
The noise temperature of an antenna is given by the expression? |
| A. | radTb + (1-rad) Tp |
| B. | (1-rad) TP |
| C. | radTb |
| D. | None of the mentioned |
| Answer» B. (1-rad) TP | |
| 8. |
With an increase in operating frequency, the background noise temperature: |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Remains unaffected |
| Answer» B. Decreases | |
| 9. |
A resistor is operated at a temperature of 300 K, with a system bandwidth of 1 MHz then the noise power produced by the resistor is: |
| A. | 3.13√ó10<sup>-23</sup> watts |
| B. | 4.14√ó10<sup>-15</sup> watts |
| C. | 6.14√ó10<sup>-15</sup> watts |
| D. | None of the mentioned |
| Answer» C. 6.14‚Äö√†√∂‚àö‚â•10<sup>-15</sup> watts | |
| 10. |
If an antenna has a directivity of 16 and is operating at a wavelength of λ, then the maximum effective aperture efficiency is:$ |
| A. | 1.27λ<sup>2</sup> |
| B. | 2.56λ<sup>2</sup> |
| C. | 0.87λ<sup>2</sup> |
| D. | None of the mentioned |
| Answer» B. 2.56‚âà√≠¬¨‚Ñ¢<sup>2</sup> | |
| 11. |
A rectangular horn antenna has an aperture area of 3λ × 2λ. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:$ |
| A. | 19 dB |
| B. | 17.1 dB |
| C. | 13 dB |
| D. | 21.1 dB |
| Answer» C. 13 dB | |
| 12. |
A rectangular horn antenna has an aperture area of 3λ × 2λ. Then the maximum directivity that can be achieved by this rectangular horn antenna is:$ |
| A. | 24 dB |
| B. | 4 dB |
| C. | 19 dB |
| D. | Insufficient data |
| Answer» D. Insufficient data | |
| 13. |
Gain of an antenna is always greater than the directivity of the antenna. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
If an antenna has a directivity of 16 and radiation efficiency of 0.9, then the gain of the antenna is: |
| A. | 16.2 |
| B. | 14.8 |
| C. | 12.5 |
| D. | 19.3 |
| Answer» B. 14.8 | |