Field strength MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Field strength”.

1. 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}

2. 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 the directivity of antenna in vertical and horizontal planes
d) both on the power radiated by the transmitting antenna & directivity in vertical and horizontal planes

3. 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

4. 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

5. Spatial attenuation coefficient is given by ____
a) (4πd/λ)2
b) (4πλ/d)2
c) 4πλ/d
d) 4πd/λ

6. 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)}

7. 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}{(4πd)^2}

8. The field strength of the surface wave of flat earth is given by ____
a) E=AE0/d
b) E=AE0
c) E=dE0/A
d) E=λE0/A

9. 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

10. 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

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