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