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xuezhiqian123
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 Inserito il - 21 gennaio 2020 : 07:21:02
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Question: 1
What word describes the bending of an RF signal as it passes through a medium of a varying density from that of free space?
A. Diffraction
B. Reflection
C. Refraction
D. Diffusion
E. Scattering
Answer: C
Question: 2
What can cause an excessively high VSWR (Voltage Standing Wave Ratio) in a WLAN RF transmission line?
A. An impedance mismatch inthe RF cables and connectors
B. Reflected direct current (DC) voltage on the main RF signal line
C. Attenuation of the RF signal as it travels along the main signal path
D. Crosstalk (inductance) between adjacent RF conductors
Answer: A
Question: 3
What factors influence the distance that an RF signal can be effectively received? (Choose 3)
A. Transmitting station#37413;#27290; power source
B. Receiving station#37413;#27290; radio sensitivity
C. Free Space Path Loss
D. MAC layer encryption
E. Transmitting station#37413;#27290;output power
F. Temperature in the Fresnel zone
Answer: B [url=http://www.themlbshop.com/Cheap-San-Francisco-Giants-Willie-Mays-Jerseys/]Willie Mays Jersey[/url] , C, E
Question: 4
As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an are
a. What term describes the rate at which this expansion happens?
A. MU-MIMO
B. Inverse square law
C. Fresnel zone thinning
D. Ohm#37413;#27290; law
Answer: B
Question: 5
Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.
What will cause high return loss in an RF transmission system, including the radio [url=http://www.themlbshop.com/Cheap-San-Francisco-Giants-Jerseys/]San Francisco Giants Jersey[/url] , cables, connectors and antenna?
A. A Voltage Standing Wave Ratio (VSWR) of 1:1
B. An impedance mismatch between components in the RF system
C. The use of cables longer than onemeter in the RF system
D. High output power at the transmitter and use of a low-gain antenna
Answer: B
Question: 6
What factors are taken into account when calculating the Link Budget of a point-to-point outdoor WLAN bridge link?
A. Operating frequency
B. Transmit antenna gain
C. Transmit power
D. Antenna height
Answer: A, B, C
Question: 7
A WLAN transmitter that emits a 200 mW signal is connected to a cable with 3 dB loss.
If the cable is connected to an antenna with 10 dBi gain [url=http://www.themlbshop.com/Cheap-San-Diego-Padres-Eric-Hosmer-Jerseys/]Eric Hosmer Jersey[/url] , what is the EIRP at the antenna element?
A. 10 dBm
B. 13 dBm
C. 20 dBm
D. 26 dBm
E. 30 dBm
Answer: E
Question: 8
In a long-distance RF link, what statement about Fade Margin is true?
A. Fade Margin is an additional pad of signal strength designed into theRF system to compensate for unpredictable signal fading.
B. The Fade Margin of a long-distance radio link should be equivalent to the receiver#37413;#27290; antenna gain.
C. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnelzone is clear of obstructions.
D. The Fade Margin is a measurement of signal loss through free space, and is a function of frequency and distance.
Answer: A
Question: 9
Which unit of measurement is an absolute unit that is used to quantify power levels on a linear scale?
A. dBm
B. SNR
C. RSSI
D. VSWR
Answer: A
Question: 10
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain.
What is the EIRP power output?
A. 2 mW
B. 500 mW
C. 250 mW
D. 1000 mW
Answer: D
Total Views: 60Word Count: 544See All articles From Author
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