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46.
A dipole antenna is connected to a transmitter. You would like to leverage the directional quality of the antenna. Based on the radiation pattern of the antenna, what
would happen if you orient the antenna such that its cylindrical shape points directly
at a distant receiver?
- A.The receiver would pick up a stronger signal.
- B.The receiver would pick up a weaker signal.
- C.The antenna is omnidirectional, so the orientation would not matter.
- D.This is pointless unless the receiver's dipole is also aimed directly at the transmitter.
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Orienting a dipole so that its cylinder points toward a receiver will probably cause the received signal to become weaker. That is because the donut-shaped radiation pattern extends outward in all directions away from the length of the antenna. By pointing the antenna at the receiver, the strongest part of the signal has been rotated away from the receiver. The radiation pattern is weakest along the length of the antenna. |
47.
Which one of the following is not true about a lightning arrestor?
- A.It is connected inline between a transmitter and an antenna.
- B.It protects against large transient spikes of energy.
- C.It protects against lightning strikes on an antenna.
- D.It directs energy to the ground, rather than the transmitter equipment.
- E.Every outdoor antenna needs one.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Lightning arrestors cannot protect against direct lightning strikes on an antenna. |
48.
Which two of the following types of wireless networks use the same frequency band?
- A.WPAN
- B.WLAN
- C.WMAN
- D.WWAN
- Answer & Explanation
- Report
Answer : [A and B]
Explanation :
Explanation :
| WPANs and WLANs can both use the unlicensed 2.4-GHz ISM band. |
49.
Devices using a wireless LAN must operate in which one of the following modes?
- A.Round-robin access
- B.Half duplex
- C.Full duplex
- D.None of these answers
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| WLANs require half-duplex operation because all stations must contend for use of a channel to transmit frames. |
50.
An access point is set up to offer wireless coverage in an office. Which one of the
following is the correct 802.11 term for the resulting standalone network?
- A.BSA
- B.BSD
- C.BSS
- D.IBSS
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| An AP offers a basic service set (BSS). |
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