CWNA RF Fundamentals & Signal Propagation

Question 1

What unit is used to express the ratio of transmitted power to received power in a wireless link?

Accepted Answer

dB

Answer

Watt

Answer

dBm

Answer

Volt

Question 2

Which phenomenon causes a wireless signal to bend around obstacles and corners?

Accepted Answer

Diffraction

Answer

Reflection

Answer

Refraction

Answer

Scattering

Question 3

What is the free-space path loss (FSPL) most dependent on?

Accepted Answer

Frequency and distance

Answer

Antenna gain only

Answer

Transmit power and receiver sensitivity

Answer

Cable type and length

Question 4

Which multipath effect can cause partial or complete signal cancellation at the receiver?

Accepted Answer

Destructive interference

Answer

Constructive interference

Answer

Forward scatter

Answer

Fresnel zone clearance

Question 5

What percentage of the first Fresnel zone should be kept clear of obstructions for optimal link performance?

Accepted Answer

60%

Answer

20%

Answer

40%

Answer

80%

Question 6

A wireless link has a transmit power of 20 dBm and a cable loss of 3 dB. What is the effective transmit power at the antenna port?

Accepted Answer

17 dBm

Answer

23 dBm

Answer

60 dBm

Answer

6 dBm