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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 basic unit of power. Equal to 1 ampere (amp) of current flowing at 1 volt
watt
fade margin
rule of 10s and 3s
intentional radiator (IR)
2. Compares a signal to 1 milliwatt of power. means 'decibels relative to 1 milliwatt.' It is a measurement of power
point source
dBm
system operating margin (SOM)
link budget
3. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
system operating margin (SOM)
isotropic radiator
equivalent isotropically radiated power (EIRP)
unit of comparison
4. The calculation of the amount of RF signal that is received minus the amount of signal required by the receiver
link budget
point source
transmitter
intentional radiator (IR)
5. 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
receiver
isotropic radiator
decibel (dB)
system operating margin (SOM)
6. Units of measure that provide comparative measurement values - not absolute measurements. Decibel is an example
receive sensitivity
unit of comparison
received signal strength indicator (RSSI)
fade margin
7. A point that radiates signal equally in all directions. e.g. sun
point source
intentional radiator (IR)
decibel (dB)
received signal strength indicator (RSSI)
8. 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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9. A level of desired signal above What is required
receive sensitivity
6 dB rule
point source
fade margin
10. 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
antenna
isotropic radiator
point source
equivalent isotropically radiated power (EIRP)
11. A point source that radiates signal equally in all directions. e.g. sun
transmitter
unit of comparison
antenna
isotropic radiator
12. 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'
unit of power
receive sensitivity
dBi
milliwatt
13. 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
unit of power
intentional radiator (IR)
6 dB rule
receive sensitivity
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
milliwatt
received signal strength indicator (RSSI)
transmitter
intentional radiator (IR)
15. 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'
dBd
received signal strength indicator (RSSI)
Newton's Inverse Square Law
unit of power
16. The amount of signal a wireless station must receive in order to distinguish between data and noise
receive sensitivity
unit of power
6 dB rule
isotropic radiator
17. It is a measurement of the ratio between two powers. Equals 10 * log10(P1/P2)
transmitter
link budget
point source
decibel (dB)
18. The initial component in a wireless medium. The computer hands the data off and this begins the RF communication
transmitter
watt
fade margin
intentional radiator (IR)
19. Units of measure that provide absolute measurement values - not relative or comparative measurements. Watt is an example
unit of power
point source
receiver
dBi
20. A device that intentionally generates and emits radio frequency energy by radiation or induction
system operating margin (SOM)
dBd
rule of 10s and 3s
intentional radiator (IR)
21. The highest RF signal strength that is transmitted from a particular antenna
equivalent isotropically radiated power (EIRP)
received signal strength indicator (RSSI)
unit of power
receive sensitivity
22. Provides approximate values when performing RF math calculations. 4 rules
decibel (dB)
rule of 10s and 3s
unit of comparison
system operating margin (SOM)
23. A unit of power equal to 1/1000 of a watt
milliwatt
unit of power
Newton's Inverse Square Law
received signal strength indicator (RSSI)