MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Antennas knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For duct propagation the necessary condition is \(\frac{dμ}{dh}\) is always +ve. |
| A. | False |
| B. | True |
| Answer» B. True | |
| 2. |
The wavelength of the EM signal propagation in the T.I.L for duct propagation is _________ |
| A. | \(λ=2.5h_d \sqrt{∆μ×10^{-6}} \) |
| B. | \(λ=2.5h_d \sqrt{∆μ×10^6} \) |
| C. | \(λ=5.2h_d \sqrt{∆μ×10^{-6}} \) |
| D. | \(λ=25h_d \sqrt{∆μ×10^{-6}} \) |
| Answer» B. \(λ=2.5h_d \sqrt{∆μ×10^6} \) | |
| 3. |
Condition for duct propagation is _________ |
| A. | \(\frac{dμ}{dh}\) is -ve |
| B. | \(\frac{dμ}{dh}\) is +ve |
| C. | \(\frac{dμ}{dh}\) is zero |
| D. | \(\frac{dμ}{dh}\) is unity |
| Answer» B. \(\frac{dμ}{dh}\) is +ve | |
| 4. |
Refractive index of temperature inversion layer is ____________ |
| A. | μ = (n-1+h/r)×106 |
| B. | μ = (n+1+h/r)×106 |
| C. | μ = (n-1-h/r)×106 |
| D. | μ = (n-1-h/r)×106 |
| Answer» B. μ = (n+1+h/r)×106 | |
| 5. |
How long the waves due to duct propagation travel following the earth curvature? |
| A. | 1000km |
| B. | 50m |
| C. | 15m |
| D. | 5000km |
| Answer» B. 50m | |
| 6. |
In which of the following propagation temperature inversion layer is present? |
| A. | Duct wave propagation |
| B. | Sky wave propagation |
| C. | Tropospheric scattering wave propagation |
| D. | Space wave propagation |
| Answer» B. Sky wave propagation | |
| 7. |
Temperature inversion layer occurs due to _____ |
| A. | Super refraction |
| B. | Reflection |
| C. | Diffraction |
| D. | Increase in altitude |
| Answer» B. Reflection | |
| 8. |
Duct propagation is due to which layer? |
| A. | Temperature Inversion layer |
| B. | Higher atmospheric layer |
| C. | Ionospheric layer |
| D. | Surface water |
| Answer» B. Higher atmospheric layer | |