Antennas Mock Test 9

10%

Question 1 of 10

1. Spatial attenuation coefficient is given by ____

(4πd/λ)²

(4πλ/d)²

4πλ/d

4πd/λ

Question 1 of 10

Question 2 of 10

2. The field strength of the wave at a unit distance from transmitting antenna depends on _____

both on the power radiated by the transmitting antenna & directivity in vertical and horizontal planes

only on directivity of antenna in vertical and horizontal planes

only the power radiated by the transmitting antenna

only on the power received by the receiving antenna

Question 2 of 10

Question 3 of 10

3. The field strength of the surface wave of flat earth is given by ____

E=AE₀/λ

E=dE₀/A

E=λE₀/A

E=AE₀/d

Question 3 of 10

Question 4 of 10

4. Which of the following propagates by gliding over the surface of earth?

Ionospheric wave

Tropospheric wave

Stratospheric waves

Surface wave

Question 4 of 10

Question 5 of 10

5. Which of the following layer disappears during night time in ionosphere?

F2 layer

E- layer

D layer

F1 layer

Question 5 of 10

Question 6 of 10

6. At which region of the troposphere the temperature remains constant throughout the narrow belt?

Tropopause

Region of calm

Region of change

Stratopause

Question 6 of 10

Question 7 of 10

7. Transmission coefficient of a plane wave with normal incidence is _________

\(γ_t=\frac{2η_2}{η_2+η_1} \)

\(γ_t=\frac{η_2}{η_2+η_1} \)

\(γ_t=\frac{2η_2}{η_2+η_1} \)

\(γ_r=\frac{η_2-η_1}{η_2+η_1} \)

Question 7 of 10

Question 8 of 10

8. Ionospheric reflections in the shape of M –type occurs between E_s and D layers

False

True

Question 8 of 10

Question 9 of 10

9. The reflection factor is given by the ratio of ____________

Difference of reflected and incident waves to sum of reflected and incident waves

Incident wave to reflected wave

Sum of reflected and incident waves to difference of reflected and incident waves

Reflected wave to incident wave

Question 9 of 10

Question 10 of 10

10. Which of the following layer is known as absorption layer for short waves?

E layer

F2 layer

D layer

F1 layer

Question 10 of 10