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16.
What are some results of multipath interference? (Choose all that apply.)
- A.Scattering delay
- B.Upfade
- C.Excessive retransmissions
- D.Absorption
- Answer & Explanation
- Report
Answer : [B, C]
Explanation :
Explanation :
| Multipath may result in attenuation, amplification, signal loss, or data corruption. If two signals arrive together in phase, the result is an increase in signal strength called upfade. The delay spread may also be too significant and cause data bits to be corrupted, resulting in excessive layer 2 retransmissions. |
17.
What term best defines the linear distance traveled in one positive-to-negative-to-positive
oscillation of an electromagnetic signal?
- A.Crest
- B.Frequency
- C.Trough
- D.Wavelength
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The wavelength is the linear distance between the repeating crests (peaks) or repeating troughs (valleys) of a single cycle of a wave pattern. |
18.
Which of the following statements are true about amplification? (Choose all that apply.)
- A.All antennas require an outside power source.
- B.RF amplifiers require an outside power source.
- C.Antennas are passive gain amplifiers that focus the energy of a signal.
- D.RF amplifiers passively increase signal strength by focusing the AC current of the signal.
- Answer & Explanation
- Report
Answer : [B, C]
Explanation :
Explanation :
| RF amplifiers introduce active gain with the help of an outside power source. Passive gain is typically created by antennas that focus the energy of a signal without the use of an outside power source. |
19.
A standard measurement of frequency is called what?
- A.Hertz
- B.Milliwatt
- C.Nanosecond
- D.Decibel
- E.K-factor
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The standard measurement of the number of times a signal cycles per second is hertz (Hz). One Hz is equal to one cycle in 1 second. |
20.
When an RF signal bends around an object, this propagation behavior is known as what?
- A.Stratification
- B.Refraction
- C.Scattering
- D.Diffraction
- E.Attenuation
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Often confused with refraction, the diffraction propagation is the bending of the wave front around an obstacle. Diffraction is caused by some sort of partial blockage of the RF signal, such as a small hill or a building that sits between a transmitting radio and a receiver. |
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