Deck 3: Wireless Communications

Question 1

Broadcast and phone transmission have conventionally used analog technology.

Answer 1

True

Question 2

Radio waves and sound waves do not share any characteristics.

Answer 2

False

Question 3

Guard Bands prevent channels from overlapping and confusing the ongoing exchange of information.

Answer 3

True

Question 4

Frequencies are banded together based upon some general characteristics.

Question 5

Shorter wavelengths of Very High Frequencies (VHF) go through building windows better than Ultra High Frequencies (UHF).

Question 6

Because of the limited number of available frequencies and the large number of users, there is channel (or frequency) duplication around the nation.

Question 7

The pattern of signals radiating from a dipole antenna is only on a horizontal plane.

Question 8

Some police departments are large enough to require multiple radio channels.

Question 9

Gain is essentially directing the antenna's radiating energy (radio waves) in a specific direction.

Question 10

In a simplex system, all users transmit and receive information different channels.

Question 11

Basic Radio Frequency (RF) communications equipment falls into three broad classifications of types, Base Station Radio, ________ and ________.

A) Analog; Digital
B) Mobile Radio Units; Cellular Technology
C) Mobile Radio Units; Handheld Radio Units
D) Handheld; Cellular technology

Question 12

In order to facilitate ________ mobile units and hand-held units combine technologies to create transceivers.

A) Two-Way communications
B) One-way Communications
C) Uplink Communications
D) Downlink Communications

Question 13

A ________ radio scheme allows for larger spectrum efficiency by using all of the frequencies allocated to an agency.

A) repeating antenna system
B) cellular system
C) digital radio system
D) trunked radio system

Question 14

________ is taking advantage of the gaps between words.

A) Cellular Digit Packet Data (CDPD)
B) Code Division Multiple Access (CDMA)
C) Time Division Multiple Access (TDMA)
D) Frequency Division Multiple Access (FDMA)

Question 15

Both digital and analog signals are carried by the fundamental building blocks of wireless communications, ________.

A) radios
B) radio signals
C) radio waves
D) radio Frequencies

Question 16

Bandwidth considerations are important because the ________ bandwidth, the ________ information a channel can handle.

A) less; more
B) more; more
C) more; less
D) less; less

Question 17

Effective radiated power refers to how far away from the source a signal can be received and interpreted. The ________ the frequency, the ________ the effective radiated power.

A) lower; lower
B) lower; higher
C) higher; lower
D) higher; higher

Question 18

Noise and interference is more of a problem for ________ frequencies than ________ frequencies.

A) lower; higher
B) lower; lower
C) higher; lower
D) higher; higher

Question 19

A ________ is the most basic type of antenna.

A) microwave
B) repeater
C) dipole
D) single source

Question 20

Radio frequency systems can be either privately owned or commercially owned. ________ owned means the systems primary user built and maintains the system. ________ owned means a private company planned, built and maintains a radio frequency infrastructure and sells the service to users.

A) Commercially; Privately
B) Privately; Semi-privately
C) Semi-privately; privately
D) Privately; Commercially

Question 21

Which of the following terms best describes a method used in wireless technology to separate multiple conversations over set frequencies and bandwidth? It is used to allocate a discrete amount of frequency bandwidth to each user; to permit many simultaneous conversations; each caller is assigned a specific time slot for transmission.

A) Shift Key Multiple Access
B) Time Division Multiple Access
C) Frequency Division Multiple Access
D) Code Division Multiple Access

Question 22

A device that sends but does not receive data is best called a:

A) Transmitter
B) Antenna
C) Receiver
D) Transceiver

Question 23

Which of the following best describes the technique of reducing the amount of storage required to hold a digital file to reduce the disk space the file requires and allow it to be processed or transmitted more quickly?

A) Modulation/De-Modulation
B) Data Compression
C) Propagation
D) Oscillation

Question 24

Which of the following is a determinant of the size of a cell?

A) Transmission Power
B) Anticipated Customer Use
C) Terrain
D) all of the above

Question 25

Frequency Shift Key Technology involves the use of:

A) Time Division Multiple Access to represent binary information
B) Multiple access signals to represent binary information
C) Digital signals to represent binary information.
D) Two separate frequencies to represent binary information

Question 26

A garbled transmission is one that is partially received or not understood due to radio interference. This radio interference could be caused by:

A) A skip transmission
B) An outside interference
C) Equipment malfunction
D) all of the above

Question 27

A Cell Site refers to:

A) The type of antenna used
B) A physical location
C) The coverage provided
D) none of the above

Question 28

Which of the following it NOT true concerning a network of cell sites?

A) A cell site is in the center of the coverage area.
B) A cell is the area of coverage provided by the cell site.
C) A cellular telephone array is usually a series of between two and six directional antennas.
D) A cell site is a physical location that contains a cellular telephone antenna array and a base station controller.

Question 29

Cellular Digit Packet Data (CDPD) is being used by law enforcement agencies. The information from a CDPD system is relayed like a cellular telephone call through a commercial carrier. Which of the following is NOT true concerning CDPD?

A) A data packet has five sections.
B) Digital information is sent in blocks of information called packets.
C) The subscriber only pays for the packets sent over the network.
D) It is a voice and data network.

Question 30

Frequency is measured in units called:

A) Signals
B) Data
C) Hertz
D) Waves