Wireless 2

Question 1

Which three properties are interrelated?

Answer 1

Frequency, wavelength and the speed of light

Question 2

Which of the following statements are true?

Answer 2

When downfade occurs, the final received signla willl never be stronger then the original transmitted signal

When upfade occurs, the final received signal will never be stronger than the orignial transmitted signal

Question 3

Which of the following can cause refraction of a RF signal traveling through it?

Answer 3

Smog
Shift in the air temeperature
Change in air pressure
Humidity

Question 4

When an RF signal bends around an object, this propagation behavior is known as what?

Answer 4

Diffraction

Question 5

Using knowledge of RF characteristics and behaviors, which two options should a WLAN engineer be most concerned about during an indoor site survery?

Answer 5

Wood-lath plaster walls

Brick walls

Question 6

What is an example of a frequency domain tool that should be used by an RF engineer?

Answer 6

Spectrum analyzer

Question 7

What is the best example of a time domain tool that could be used by an RF engineer?

Answer 7

Oscilloscope

Question 8

Which behavior can be described as an RF signal encountering a chain link fence, causing the signal to bounce into multiple directionss

Answer 8

Scatter

Question 9

Which of the following statements are true about amplification

Answer 9

RF amplifiers require an outside power source

Antennas are passive gain amplifiers that focus the energy of a signal

Question 10

Which of these propagation behaviours can result in multipath

Answer 10

Scattering
Reflection
Refraction
Diffraction

Question 11

What are some reults of multipath interference

Answer 11

Excessive retransmission

upfade

Question 12

Which 802.11 radio technologies are most impacted by the destructive effects of multipath?

Answer 12

802. 11b
803. 11a
804. 11g

Question 13

Which of the following statements are true about free space path loss?

Answer 13

RF signal will attenuate as they travel, despite the lacak attenuation caused by obstructions

Path loss occurs at logarithmic rate

Question 14

What is the frequency of an RF signal that cycles 2.4 million time per second?

Answer 14

2.4 MHz

Question 15

What are some objects or materials that are common causes of reflection?

Answer 15

Metal
Lake
Asphalt road

Question 16

Which RF behavior best describes a signal striking a medium and bending in a different direction?

Answer 16

Refraction

Question 17

What term is used to describe the time differential between a primary signal and a reflected signal arriving at a receiver?

Answer 17

Delay spread

Question 18

When the multiple RF signals arrive at a receive at the same time are ____ with the primary wave, the result can be ____ of the primary signal

Answer 18

180 degrees out of phase, cancellation

Question 19

A standard measurement of frequency is called what?

Answer 19

Hertz

Question 20

What terms best defines the linear distance traveled in one positive-to-negative-to-positive osicallatoin of an electromagnetic signal?

Answer 20

Wavelength