MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Antennas knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the equivalent radius of the earth when the ray appears to be a straight line over a flat earth surface? |
| A. | 0 |
| B. | Infinity |
| C. | Actual radius |
| D. | 4/3 times actual radius |
| Answer» C. Actual radius | |
| 2. |
The effective radius of earth is how many times the actual radius of earth at standard atmospheric conditions? |
| A. | 3/4 |
| B. | 4/3 |
| C. | 1/4 |
| D. | 1/3 |
| Answer» B. 4/3 | |
| 3. |
Dissipation factor for the dielectric is Df= ____ |
| A. | \(1.8×10^6 \frac{σ}{f(MHz)}\) |
| B. | \(1.8 \frac{σ}{f(MHz)}\) |
| C. | \(1.8×10^6\frac{σ}{f(GHz)}\) |
| D. | \(1.8×10^3 \frac{σ}{f(MHz)}\) |
| Answer» B. \(1.8 \frac{σ}{f(MHz)}\) | |
| 4. |
The field strength of the surface wave of flat earth is given by ____ |
| A. | E=AE0/d |
| B. | E=AE0/λ |
| C. | E=dE0/A |
| D. | E=λE0/A |
| Answer» B. E=AE0/λ | |
| 5. |
Spatial attenuation coefficient is given by ____ |
| A. | (4πd/λ)2 |
| B. | (4πλ/d)2 |
| C. | 4πλ/d |
| D. | 2c) 4πλ/dd) 4πd/λ |
| Answer» B. (4πλ/d)2 | |
| 6. |
Power density of the receiving antenna is given by _________ |
| A. | \(P_D=\frac{P_t G_t}{4πd^2}\) |
| B. | \(P_D=\frac{P_t G_t}{(4πd/λ)^2}\) |
| C. | \(P_D=\frac{P_t G_t G_r}{(4πd/λ)^2}\) d) \(P_D=\frac{P_t G_t}{(4π |
| D. | \(P_D=\frac{P_t G_t}{(4πd)^2}\) |
| Answer» B. \(P_D=\frac{P_t G_t}{(4πd/λ)^2}\) | |
| 7. |
What is the condition of roughness of earth for earth to be electrically smooth? |
| A. | R < 0.1 |
| B. | R > 10 |
| C. | R > 0.1 |
| D. | R > 1 |
| Answer» B. R > 10 | |
| 8. |
The field strength of the wave at a unit distance from transmitting antenna depends on _____ |
| A. | only the power radiated by the transmitting antenna |
| B. | only on the power received by the receiving antenna |
| C. | only on directivity of antenna in vertical and horizontal planes |
| D. | both on the power radiated by the transmitting antenna & directivity in vertical and horizontal planes |
| Answer» E. | |
| 9. |
The path difference given by two-ray model is ___ |
| A. | \(\frac{4πh_t h_r}{λd^2}\) |
| B. | \(\frac{4πh_t h_r}{d}\) |
| C. | \(\frac{4h_t h_r}{d}\) |
| D. | \(\frac{2h_t h_r}{d}\) |
| Answer» E. | |
| 10. |
The field strength due to space wave propagation is E=____ |
| A. | \(\frac{4πh_t h_r}{λd^2}E_0\) |
| B. | \(\frac{2πh_t h_r}{λd^2}E_0\) |
| C. | \(\frac{4πh_t h_r}{λd}E_0\) |
| D. | \(\frac{4πh_t h_r}{λd^4}E_0\) |
| Answer» B. \(\frac{2πh_t h_r}{λd^2}E_0\) | |