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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 antenna that consists of two elements. A half-wave type antenna consists of two elements - each 1/4 of the wavelength long
semi-directional antenna
dipole antenna
parabolic dish antenna
attenuator
2. The curvature of the earth - which must be considered when installing long distance point-to-point RF communications
earth bulge
grid
Fresnel zone
phased array antenna
3. A special type of high-gain - semi-directional antenna that provide a pie-shaped coverage pattern
sector antenna
semi-directional antenna
splitters
multiple input multiple output (MIMO)
4. A type of semi-directional planar antenna designed to direct a signal in a specific direction.
patch antenna
back lobe
splitters
dipole antenna
5. 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
voltage standing wave ratio (VSWR)
panel antenna
yagi
back lobe
6. Labeled E-plane - shows the side view of the radiation pattner of the antenna
elevation charts
phased array antenna
antenna diversity
antenna polarization
7. Refers to the the back of an antenna
back lobe
attenuator
line of sight (LOS)
multiple input multiple output (MIMO)
8. A type of semi-directional planar antenna designed to direct a signal in a specific direction. Used for short-to medium-distance communications
azimuth charts
omni-directional antenna
panel antenna
Fresnel zone
9. The measurement of how broad or narrow the focus of an antenna is. Measured both horizontally and vertically
beamwidth
attenuator
Fresnel zone
omni-directional antenna
10. An antenna system made up of multiple antennas that are connected to the signal processor.
panel antenna
ighly-directional antenna
phased array antenna
grid
11. A device that redirects (shunts) transient currents caused by nearby lighting strikes or ambient static away from your electronic equipment and into the ground
patch antenna
lightening arrestor
panel antenna
antenna polarization
12. Takes an RF signal and divides it into two or more separate signals
parabolic dish antenna
splitters
back lobe
semi-directional antenna
13. When an access point has two antennas and receivers functioning together to minimize the negative effects of multipath
elevation charts
panel antenna
antenna diversity
back lobe
14. 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
beamwidth
ighly-directional antenna
grid
antenna diversity
15. 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
sector antenna
attenuator
back lobe
multiple input multiple output (MIMO)
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
earth bulge
antenna polarization
ighly-directional antenna
parabolic dish antenna
17. A type of antenna that radiates RF signals in all directions
splitters
elevation charts
omni-directional antenna
antenna polarization
18. An imaginary football-shaped area that surrounds the path of the visual LOS between two point-to-point antennas
attenuator
phased array antenna
Fresnel zone
voltage standing wave ratio (VSWR)
19. Labeled H-plane - shows the top-down view of the radiation pattern of the antenna
sector antenna
back lobe
multiple input multiple output (MIMO)
azimuth charts
20. Any RF communications system that has multiple antennas at both ends of the communications link and being used concurrently
beamwidth
patch antenna
antenna polarization
multiple input multiple output (MIMO)
21. When light travels from one point to another - it travels across What is perceived to be an unobstructed straight line
multiple input multiple output (MIMO)
voltage standing wave ratio (VSWR)
line of sight (LOS)
phased array antenna
22. 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
elevation charts
omni-directional antenna
sector antenna
23. The orientation of the antenna. Antennas radiate RF signals with the amplitude of the waves fluctuating either vertically or horizontally
sector antenna
earth bulge
omni-directional antenna
antenna polarization
24. A type of antenna that is designed to direct a signal in a specifi direction
back lobe
panel antenna
splitters
semi-directional antenna
25. 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)
omni-directional antenna
voltage standing wave ratio (VSWR)
ighly-directional antenna
splitters