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Test your basic knowledge |
CWNA Radio Frequency Signal And Antenna Concepts
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 25 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. An imaginary football-shaped area that surrounds the path of the visual LOS between two point-to-point antennas
Fresnel zone
attenuator
back lobe
yagi
2. A type of semi-directional planar antenna designed to direct a signal in a specific direction.
omni-directional antenna
patch antenna
antenna diversity
yagi
3. Refers to the the back of an antenna
yagi
parabolic dish antenna
lightening arrestor
back lobe
4. A highly-directional antenna that is similiar to the small digital satellite TV antennas that can be seen on the roofs of many houses
Fresnel zone
phased array antenna
parabolic dish antenna
ighly-directional antenna
5. A highly-directional antenna taht resembles the rectangular grill of a barbeque - with the edges slightly curved inward. The spacing of the wries on this is determined by the wavelength of the frequencies that the antenna is designed for
antenna diversity
Fresnel zone
grid
ighly-directional antenna
6. The curvature of the earth - which must be considered when installing long distance point-to-point RF communications
patch antenna
yagi
earth bulge
splitters
7. An antenna that consists of two elements. A half-wave type antenna consists of two elements - each 1/4 of the wavelength long
parabolic dish antenna
yagi
line of sight (LOS)
dipole antenna
8. The orientation of the antenna. Antennas radiate RF signals with the amplitude of the waves fluctuating either vertically or horizontally
yagi
antenna polarization
phased array antenna
earth bulge
9. A type of semi-directional planar antenna designed to direct a signal in a specific direction. Used for short-to medium-distance communications
patch antenna
antenna polarization
grid
panel antenna
10. Small devices about the size of a C-cell battery - with cable connectors on both sides. They absorb energy - decreasing the signal as it travels through. Fixed types provide a set amount of loss. Variable loss types have a dial on it that allows you
attenuator
antenna diversity
back lobe
parabolic dish antenna
11. When an access point has two antennas and receivers functioning together to minimize the negative effects of multipath
grid
back lobe
antenna diversity
phased array antenna
12. A numerical relationship between the measurement of the maximum voltage along the line (what is generated by the transmitter) and the measurement of the mimimum voltage along the line (what is received by the antenna)
back lobe
lightening arrestor
voltage standing wave ratio (VSWR)
panel antenna
13. Labeled E-plane - shows the side view of the radiation pattner of the antenna
voltage standing wave ratio (VSWR)
elevation charts
phased array antenna
line of sight (LOS)
14. A type of antenna that is designed to direct a signal in a specifi direction
earth bulge
patch antenna
semi-directional antenna
Fresnel zone
15. Labeled H-plane - shows the top-down view of the radiation pattern of the antenna
omni-directional antenna
semi-directional antenna
line of sight (LOS)
azimuth charts
16. Takes an RF signal and divides it into two or more separate signals
line of sight (LOS)
azimuth charts
splitters
phased array antenna
17. A type of antenna that radiates RF signals in all directions
semi-directional antenna
omni-directional antenna
Fresnel zone
patch antenna
18. Strictly used for point-to-point communications - typicall to provide network bridging between two buildings. These provide the most focused - narrow beamwidth of any of the antenna types. There are two types of these: parabolic dish and grid
ighly-directional antenna
semi-directional antenna
dipole antenna
antenna polarization
19. Starts with a y. A type of semi-directional antenna designed to direct a signal in a specific direction. Used for short to medium-distance communication
elevation charts
yagi
multiple input multiple output (MIMO)
semi-directional antenna
20. When light travels from one point to another - it travels across What is perceived to be an unobstructed straight line
antenna diversity
line of sight (LOS)
elevation charts
splitters
21. An antenna system made up of multiple antennas that are connected to the signal processor.
phased array antenna
earth bulge
dipole antenna
attenuator
22. The measurement of how broad or narrow the focus of an antenna is. Measured both horizontally and vertically
attenuator
voltage standing wave ratio (VSWR)
panel antenna
beamwidth
23. A device that redirects (shunts) transient currents caused by nearby lighting strikes or ambient static away from your electronic equipment and into the ground
back lobe
Fresnel zone
lightening arrestor
antenna polarization
24. Any RF communications system that has multiple antennas at both ends of the communications link and being used concurrently
antenna polarization
multiple input multiple output (MIMO)
patch antenna
earth bulge
25. A special type of high-gain - semi-directional antenna that provide a pie-shaped coverage pattern
yagi
sector antenna
splitters
elevation charts