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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. 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 polarization
antenna diversity
ighly-directional antenna
grid
2. Refers to the the back of an antenna
ighly-directional antenna
sector antenna
back lobe
grid
3. 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
earth bulge
yagi
attenuator
back lobe
4. A type of semi-directional planar antenna designed to direct a signal in a specific direction.
patch antenna
azimuth charts
sector antenna
parabolic dish antenna
5. Takes an RF signal and divides it into two or more separate signals
splitters
sector antenna
lightening arrestor
attenuator
6. When light travels from one point to another - it travels across What is perceived to be an unobstructed straight line
beamwidth
line of sight (LOS)
ighly-directional antenna
omni-directional antenna
7. When an access point has two antennas and receivers functioning together to minimize the negative effects of multipath
voltage standing wave ratio (VSWR)
patch antenna
sector antenna
antenna diversity
8. An antenna system made up of multiple antennas that are connected to the signal processor.
patch antenna
multiple input multiple output (MIMO)
yagi
phased array antenna
9. A special type of high-gain - semi-directional antenna that provide a pie-shaped coverage pattern
splitters
back lobe
sector antenna
patch antenna
10. A device that redirects (shunts) transient currents caused by nearby lighting strikes or ambient static away from your electronic equipment and into the ground
beamwidth
lightening arrestor
grid
antenna diversity
11. 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
lightening arrestor
yagi
elevation charts
earth bulge
12. An imaginary football-shaped area that surrounds the path of the visual LOS between two point-to-point antennas
elevation charts
earth bulge
Fresnel zone
back lobe
13. A type of antenna that radiates RF signals in all directions
omni-directional antenna
grid
panel antenna
lightening arrestor
14. The curvature of the earth - which must be considered when installing long distance point-to-point RF communications
parabolic dish antenna
earth bulge
lightening arrestor
voltage standing wave ratio (VSWR)
15. The measurement of how broad or narrow the focus of an antenna is. Measured both horizontally and vertically
multiple input multiple output (MIMO)
beamwidth
antenna polarization
splitters
16. A highly-directional antenna that is similiar to the small digital satellite TV antennas that can be seen on the roofs of many houses
antenna polarization
splitters
patch antenna
parabolic dish antenna
17. The orientation of the antenna. Antennas radiate RF signals with the amplitude of the waves fluctuating either vertically or horizontally
parabolic dish antenna
multiple input multiple output (MIMO)
antenna polarization
ighly-directional antenna
18. Any RF communications system that has multiple antennas at both ends of the communications link and being used concurrently
attenuator
back lobe
omni-directional antenna
multiple input multiple output (MIMO)
19. A type of semi-directional planar antenna designed to direct a signal in a specific direction. Used for short-to medium-distance communications
omni-directional antenna
ighly-directional antenna
parabolic dish antenna
panel antenna
20. Labeled H-plane - shows the top-down view of the radiation pattern of the antenna
azimuth charts
omni-directional antenna
semi-directional antenna
panel antenna
21. A type of antenna that is designed to direct a signal in a specifi direction
semi-directional antenna
splitters
antenna diversity
back lobe
22. 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
antenna diversity
sector antenna
dipole antenna
23. 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
antenna polarization
elevation charts
ighly-directional antenna
yagi
24. 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)
voltage standing wave ratio (VSWR)
line of sight (LOS)
panel antenna
antenna diversity
25. Labeled E-plane - shows the side view of the radiation pattner of the antenna
dipole antenna
ighly-directional antenna
elevation charts
attenuator