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91.
Omnidirectional antennas have a horizontal beamwidth of _____________ degrees.
- A.90
- B.180
- C.270
- D.360
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Omnidirectional antennas have a horizontal beamwidth of 360°. The vertical beamwidth will vary depending on the design and the gain of the antenna. |
92.
Antennas provide an increase in RF coverage by using ______________ gain.
- A.Active
- B.Passive
- C.Positive
- D.Maximum
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Antennas provide an increase in RF coverage by means of passive gain. Passive gain occurs when isotropic RF energy is focused into a specifi c radiation pattern. Active gain requires the use of an external power source. |
93.
Horizontal beamwidth is ___________ to the earth’s surface.
- A.Parallel
- B.Perpendicular
- C.Positive
- D.Negative
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Horizontal beamwidth is parallel to the earth’s surface. This is based on how the E-fi eld propagates away from the antenna element. Vertical beamwidth is perpendicular to the earth’s surface. |
94.
An access point requires ___________ antennas for diversity functionality.
- A.one
- B.two
- C.three
- D.six
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| An access point will require two antennas for diversity. Although there are two antennas, a single input/single output access point will have only one radio. The access point provides additional intelligence to determine which antenna to use. Other wireless LAN technologies such as MIMO may use up to three antennas. |
95.
What device is used to shunt transient current to ground in the event of an indirect lightning
strike ?
- A.Lightning striker
- B.Lightning arrestor
- C.Lightning prevention
- D.Lightning breaker
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| A lightning arrestor is used to protect a wireless LAN system from an indirect lightning strike. A lightning arrestor will direct transient or induced electrical current to earth ground as a result of a lightning strike. |
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