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Test your basic knowledge |
CWNA Radio Frequency Components Measurements And Mathematics
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 23 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 point source that radiates signal equally in all directions. e.g. sun
isotropic radiator
6 dB rule
equivalent isotropically radiated power (EIRP)
intentional radiator (IR)
2. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
receive sensitivity
Newton's Inverse Square Law
unit of comparison
decibel (dB)
3. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
unit of power
6 dB rule
system operating margin (SOM)
received signal strength indicator (RSSI)
4. Provides two functions in a communication system. When connected to the transmitter - it collects the AC signal that it receives from the trasmitter and directs - or radiates - the RF waves away from the antenna in a pattern specific to the antenna t
unit of comparison
antenna
fade margin
rule of 10s and 3s
5. A point that radiates signal equally in all directions. e.g. sun
receiver
receive sensitivity
point source
unit of comparison
6. The increase in gain of an antenna - conmpared to the signal of a dipole antenna. Another way of phrasing this is 'decibel gain relative to a dipole antenna'
transmitter
intentional radiator (IR)
dBd
Newton's Inverse Square Law
7. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
antenna
point source
link budget
unit of comparison
8. The final component in a wireless medium. It takes the carrier signal that is received from the antenna and translates the modulated signals into 1s and 0s. it then takes this data and passes it to the computer to be processed
receive sensitivity
receiver
unit of power
dBi
9. A basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
point source
watt
dBi
system operating margin (SOM)
10. A unit of power equal to 1/1000 of a watt
milliwatt
receiver
system operating margin (SOM)
6 dB rule
11. Provides approximate values when performing RF math calculations. 4 rules
dBi
decibel (dB)
transmitter
rule of 10s and 3s
12. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
transmitter
dBi
link budget
point source
13. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
unit of power
link budget
antenna
receiver
14. Used by a wireless device to determine if another device is transmitting - also known as a clear channel assessment. An optional 802.11 parameter with a value of 0 to 255. It is designed by the hardware manufacturer as a relative measurement of the R
isotropic radiator
unit of power
received signal strength indicator (RSSI)
link budget
15. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
receiver
milliwatt
decibel (dB)
16. Gain or increase of power from an antenna when compared to what an isotropic radiator would generate. Another way of phrasing this is 'decibel gain relative to an isotropic radiator'
receiver
equivalent isotropically radiated power (EIRP)
fade margin
dBi
17. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
watt
unit of comparison
dBm
equivalent isotropically radiated power (EIRP)
18. The highest RF signal strength that is transmitted from a particular antenna
equivalent isotropically radiated power (EIRP)
watt
unit of comparison
antenna
19. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
fade margin
received signal strength indicator (RSSI)
dBd
dBm
20. This law states that the change in power is equal to 1 divided by the square of the change in distance
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21. A level of desired signal above What is required
isotropic radiator
fade margin
point source
receive sensitivity
22. Doubling the distance between a transmitter and receiver will decrease the received signal by 6 dB. Halving the distance between a transmitter and receiver will increase the received signal by 6 dB
dBm
receiver
6 dB rule
dBi
23. A device that intentionally generates and emits radio frequency energy by radiation or induction
isotropic radiator
equivalent isotropically radiated power (EIRP)
intentional radiator (IR)
transmitter