MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Antennas knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When the frequency decreases below _____ frequency, the signal reception becomes too weak and the Noise increases. |
| A. | MUF |
| B. | LUF |
| C. | Optimum frequency |
| D. | Critical frequency |
| Answer» C. Optimum frequency | |
| 2. |
Which of the following frequency is greater than the critical frequency? |
| A. | MUF |
| B. | LUF |
| C. | Optimum frequency |
| D. | VLF |
| Answer» B. LUF | |
| 3. |
For fMUF ≥ fc, the wave will reflects back irrespective of the angle of incidence. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
The value of refractive index when the MUF is equal to the critical frequency is ______ |
| A. | 1 |
| B. | 0 |
| C. | 0.5 |
| D. | 0.29 |
| Answer» C. 0.5 | |
| 5. |
Find the critical frequency when the refractive index of the layer is 0.54 and MUF is 9MHz? |
| A. | 0.84MHz |
| B. | 7.57MHz |
| C. | 0.75MHz |
| D. | 8.4MHz |
| Answer» C. 0.75MHz | |
| 6. |
For a regular layer, the critical frequency is proportional to the ______ of electron density. |
| A. | Square |
| B. | Inverse |
| C. | Square root |
| D. | Inverse square root |
| Answer» D. Inverse square root | |
| 7. |
What is the electron density of the layer if critical frequency is 3 MHz? |
| A. | 11×1012/cm3 |
| B. | 0.11×1012/cm3 |
| C. | 1.1×1012/cm3 |
| D. | 0.11×1010/cm3 |
| Answer» C. 1.1×1012/cm3 | |
| 8. |
What is the critical frequency when the electron density in the F1 layer is 20×1010/cm3? |
| A. | 40.2GHz |
| B. | 4.02 MHz |
| C. | 40.2 MHz |
| D. | 40.2Hz |
| Answer» C. 40.2 MHz | |
| 9. |
When a wave is incident normally then the acceptable highest frequency at which signal can be returned is the ______ |
| A. | critical frequency |
| B. | LUF |
| C. | optimum frequency |
| D. | dominating frequency |
| Answer» B. LUF | |