CWS RF Behavior & Signal Propagation 3

Question 1

What term describes the process by which an RF signal bounces off a flat, smooth surface such as a metal wall?

Accepted Answer

Reflection

Answer

Reflection occurs when an RF wave strikes a smooth, flat surface and bounces back at an angle equal to the angle of incidence.

Question 2

Which material is known to cause the highest RF signal absorption losses in an indoor environment?

Accepted Answer

Cinder block walls

Answer

Cinder block (concrete masonry) walls cause high RF attenuation, often 10–15 dB or more, making them one of the most significant indoor obstacles.

Question 3

In a point-to-multipoint outdoor wireless deployment, what is the primary propagation concern over long distances that causes signal bending toward the Earth?

Accepted Answer

Atmospheric refraction due to the k-factor

Answer

The k-factor describes how the Earth's atmosphere refracts RF signals, effectively making the Earth appear larger and affecting line-of-sight clearance calculations.

Question 4

Which antenna property describes the ratio of power radiated in a specific direction versus an isotropic radiator?

Accepted Answer

Antenna gain (dBi)

Answer

Antenna gain in dBi expresses how much more signal an antenna radiates in its primary direction compared to a theoretical isotropic radiator.

Question 5

What propagation effect occurs when atmospheric conditions create a layer that traps RF energy close to the Earth's surface, extending range unexpectedly?

Accepted Answer

Tropospheric ducting

Answer

Tropospheric ducting traps RF signals in a low-altitude layer, allowing them to travel far beyond their normal range and potentially causing interference.

(CWS) Certified Wireless Specialist Practice Test

(CWS) Certified Wireless Specialist Practice Test

CWS RF Behavior & Signal Propagation 3