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