Question 1

A(n) ____________________ signal has numerous starts and stops throughout the signal stream.

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Question 2

What is amplitude modulation?

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Question 3

____ antennas are used for long distance, point-to-point wireless links, such as connecting buildings that are up to 42 kilometers (25 miles) apart.
A) Fresnel
B) Omni-directional
C) Semi-directional
D) Highly-directional

Accepted Answer

Highly-directional antennas are designed to focus the signal in a specific direction, making them ideal for long distance, point-to-point connections. A Fresnel antenna is used for point-to-point microwave communication, but only up to a distance of about 8 kilometers (5 miles). Omni-directional and semi-directional antennas are not suitable for long distance point-to-point links as they are designed to radiate the signal in all directions.

Question 4

What is the free space loss (in dB) for IEEE 802.11b and 802.11g WLANs when the distance in meters is 100?
A) 80
B) 88
C) 92
D) 97

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Question 5

____ polarization is typically used in wireless LANs with the dual antennas of access points pointing upward.
A) Vertical
B) Horizontal
C) Circular
D) Dual

Accepted Answer

Vertical polarization is the best choice in this scenario because it provides the strongest signal when the antennas of both the access point and the client devices are aligned in the same orientation. This is because the radio waves are transmitted and received in a vertically oriented pattern. Horizontal polarization, on the other hand, would result in weaker signal strength and higher levels of interference due to cross-polarization. Circular polarization and dual polarization are not typically used in this type of wireless LAN setup.

Question 6

What is the shape of a Fresnel zone?
A) Circular
B) Rectangular
C) Ellipsoidal
D) Elliptical

Accepted Answer

Fresnel zones are ellipsoidal areas between a transmitter and a receiver in which obstacles can cause phase cancellations of the transmitted signal, affecting its strength and quality.

Question 7

How does an antenna work?

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Question 8

A ____ dipole antenna produces a flatter signal than a standard dipole antenna.
A) Fresnel
B) high-gain
C) zoned
D) semi-directional

Accepted Answer

High-gain antennas are designed to focus the signal in a specific direction, which can result in a flatter, more directed signal compared to a standard dipole antenna that radiates more uniformly in all directions.

Question 9

Why is it important to understand how wireless technology works?

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Question 10

Resistance is measured in ohms and the total amount of resistance is called the ____________________.

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Question 11

There are several factors that may result in RF loss. List and describe three of them.

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Question 12

What is the difference between an analog and digital signal? Provide an example of each signal type.

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Question 13

____________________ is defined as the positive difference in amplitude between two signals.

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Question 14

How is RF power measured?

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Question 15

What is polarization?

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Question 16

RF power gain and loss on a relative scale are measured in ____________________ instead of mW.

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Question 17

There are several advantages of digital modulation over analog modulation. What are they?

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Question 18

The length of an antenna should be about ____ the wavelength.
A) 1/10 of
B) 1/4 of
C) 1/2 of
D) equal to

Accepted Answer

A common design for antennas, especially for radio frequencies, is to make them 1/4 of the wavelength to ensure efficient transmission and reception.

Question 19

A(n) ____________________ is a copper wire or similar device that has one end up in the air and the other end connected to the ground or a grounded device.

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Question 20

What is antenna diversity?

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Quiz 3: How Wireless Works