18 Questions
Which of the following is NOT a type of radio wave propagation mode?
Infrared waves
What is the primary factor that affects the propagation of radio waves in the atmosphere?
Ionization of the atmosphere
Which of the following is NOT a characteristic of line-of-sight (LOS) radio communication?
It relies on sky wave propagation for long-distance communication.
What is the primary mechanism that causes fading in radio wave propagation?
Multipath propagation
Which of the following is a widely used radio wave propagation model for predicting signal strength in urban environments?
Okumura-Hata model
What is the primary reason for the attenuation of radio waves as they propagate through the atmosphere?
Both absorption and scattering
What is the primary factor that limits the range of direct wave signals in terrestrial propagation?
The curvature of the Earth's surface and the antenna heights
Which of the following statements about the radio horizon is correct?
The radio horizon is approximately 4/3 times the optical horizon due to atmospheric refraction.
Which of the following equations is used to calculate the maximum distance between the transmitter and receiver over average terrain?
$D = 17h_t + 17h_r$
What type of radio wave propagation is being discussed in the given text?
Line-of-sight propagation
Which of the following statements about ground-reflected waves is true?
They are waves that are reflected by the Earth's surface.
What is the primary factor that determines the radio horizon distance?
The height of the transmitting and receiving antennas
What is the primary cause of severe absorption of microwave frequencies in the Earth's atmosphere?
Precipitation
What is the relationship between the velocity of propagation of an electromagnetic wave and the density of the medium it is propagating through?
The velocity is inversely proportional to the density of the medium.
How is the refractive index of a medium mathematically defined?
The refractive index is the square root of the dielectric constant of the medium.
What is the key factor that determines the amount of bending or refraction that occurs when an electromagnetic wave passes from one medium to another?
The difference in refractive indices of the two media
Which of the following is NOT one of the optical effects mentioned in the passage that can alter the ray-wavefront propagation of electromagnetic waves in the Earth's atmosphere?
Dispersion
Which of the following statements best describes the relationship between electromagnetic refraction and the bending of the radiowave path?
The radiowave path bends, but the electromagnetic ray itself does not actually bend.
Test your knowledge on Wi-Fi technology, 4G and 5G networks, electromagnetic radiation principles, power density calculations, and wave attenuation concepts.
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