Wireless Technologies Quiz

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Which of the following is NOT a type of radio wave propagation mode?

Sky waves

Infrared waves (correct)

Space waves

Ground waves

What is the primary factor that affects the propagation of radio waves in the atmosphere?

Temperature

Atmospheric pressure

Ionization of the atmosphere (correct)

Humidity

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. (correct)

It is used for short-range communications, such as in cellular networks.

The signal strength decreases with distance due to free-space path loss.

The transmitting and receiving antennas must have a clear, unobstructed path between them.

What is the primary mechanism that causes fading in radio wave propagation?

Multipath propagation Signup and view all the answers

Which of the following is a widely used radio wave propagation model for predicting signal strength in urban environments?

Okumura-Hata model Signup and view all the answers

What is the primary reason for the attenuation of radio waves as they propagate through the atmosphere?

Both absorption and scattering Signup and view all the answers

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 Signup and view all the answers

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. Signup and view all the answers

Which of the following equations is used to calculate the maximum distance between the transmitter and receiver over average terrain?

$D = 17h_t + 17h_r$ Signup and view all the answers

What type of radio wave propagation is being discussed in the given text?

Line-of-sight propagation Signup and view all the answers

Which of the following statements about ground-reflected waves is true?

They are waves that are reflected by the Earth's surface. Signup and view all the answers

What is the primary factor that determines the radio horizon distance?

The height of the transmitting and receiving antennas Signup and view all the answers

What is the primary cause of severe absorption of microwave frequencies in the Earth's atmosphere?

Precipitation Signup and view all the answers

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. Signup and view all the answers

How is the refractive index of a medium mathematically defined?

The refractive index is the square root of the dielectric constant of the medium. Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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. Signup and view all the answers