Deck 4: Transmission Media

Question 1

The same antenna cannot be used for both transmission and reception in two way communication.

Answer 1

False

Question 2

The parabolic reflective antenna is a type of antenna used in terrestrial microwave and satellite applications.

Answer 2

True

Question 3

Twisted pair is much less susceptible to interference and crosstalk than coaxial cable.

Answer 3

False

Question 4

The ________ class is targeted for support of next generation applications beyond 10-Gbps Ethernet.

A)Category 5e/Class D
B)Category 6A/Class E_A
C)Category 6/Class E
D)Category 7/Class F

Question 5

Guided media employ an antenna for transmitting through air, vacuum,or water.

Question 6

________ twisted pair is subject to external electromagnetic interference,including interference from nearby twisted pair and from noise generated in the environment.

A)Standard
B)Shielded
C)Unshielded
D)Coaxial

Question 7

Twisted pair may only be used to transmit analog and digital signals.

Question 8

Coaxial cable can be used over longer distances and support more stations on a shared line than twisted pair.

Question 9

Microwave is used in cellular systems.

Question 10

A ________ consists of two insulated copper wires arranged in a regular spiral pattern.

A)coaxial cable
B)optical fiber
C)cable
D)twisted pair

Question 11

Unshielded twisted pair provides better performance at higher data rates.

Question 12

The characteristics and quality of a data transmission are determined both by the characteristics of the medium and the characteristics of the signal.

Question 13

The most commonly used medium in the telephone network is twisted pair.

Question 14

Microwave is used for satellite communications.

Question 15

Attenuation is significantly lower for optical fiber than for coaxial cable or twisted pair and is constant over a wide range.

Question 16

Coaxial cable is used to transmit both analog and digital signals.

Question 17

Wireless transmission occurring through the atmosphere,outer space or water is an example of ________.

A)guided media
B)bandwidth
C)wavelength
D)unguided media

Question 18

For ________ transmission media,the transmission capacity,in terms of either data rate or bandwidth,depends critically on the distance and on whether the medium is point-to-point or multipoint.

A)unguided
B)guided
C)terrestrial microwave
D)atmospheric

Question 19

Data rate and distance are not a key concern when designing a data transmission system.

Question 20

The transmission media that are used to convey information can be classified as guided or unguided.

Question 21

Requiring line of site transmission and fewer amplifiers or repeaters than coaxial cable over the same distance,________ is used in long haul telecommunications.

A)terrestrial microwave
B)twisted pair
C)UTP
D)optical fiber

Question 22

Often used in LANs,________ transmission has a higher refractive index at the center which makes the light rays moving down the axis advance more slowly than those near the cladding.

Question 23

Typically used for long distance applications,________ propagation provides superior performance because there is a single transmission path.

A)single-mode
B)direct-line mode
C)step-index multimode
D)graded-index multimode

Question 24

When using optical fiber,the term ________ refers to the change in direction of light rays after they strike small particles or impurities in the medium.

A)relay
B)scattering
C)parabola
D)directrix

Question 25

Wireless transmission frequencies in the range of 30 MHz to 1 GHz are suitable for omnidirectional applications and are referred to as the ________ range.

A)radio
B)transponder
C)terrestrial
D)paraboloid

Question 26

________ is a general term used to encompass frequencies in the range of 3 kHz to 300 GHz.

A)Radio
B)Satellite
C)Terrestrial microwave
D)Broadcast radio

Question 27

Defined as the power output in a particular direction compared to that produced in any direction by a perfect omnidirectional antenna,________ is a measure of the directionality of the antenna.

A)effective area
B)antenna gain
C)parabola
D)antenna wavelength

Question 28

A loss between the transmitting and receiving antennas caused by water vapor and oxygen is ________.

A)atmospheric absorption
B)parabolic loss
C)atmospheric interference
D)isotropic loss

Question 29

Wireless transmission frequencies in the range of about 1 GHz to 40 GHz are referred to as ________ frequencies.Highly directional beams are possible at these frequencies.

Question 30

A thin,flexible medium capable of guiding an optical ray is an ________.

Question 31

In a data transmission system the ________ medium is the physical path between transmitter and receiver.

Question 32

Twisted pair,coaxial cable and optical fiber are examples of ________ media,which provide a physical path along which signals are propagated.

Question 33

The ________ standards identify a number of categories of cabling and associated components that can be used for premises and campus-wide data distribution.

Question 34

The two different types of light source used in fiber optic systems are the ________.

A)single mode and the multimode
B)LID and the DEL
C)TIR and the GIM
D)light-emitting diode and the injection laser diode

Question 35

The transmission medium used for television distribution,long distance telephone transmission,and short run computer system links is ________.

A)coaxial cable
B)unshielded twisted pair
C)shielded twisted pair
D)optical fiber

Question 36

The least expensive and most widely used guided transmission medium for both analog and digital signals is ________.

Question 37

A communication ________ is a microwave relay station used to link two or more ground based microwave transmitter/receivers known as earth stations.

A)transmitter
B)transponder
C)dish
D)satellite

Question 38

Optical fiber transmits a signal encoded beam of light by means of ________.This can occur in any transparent medium that has a higher index of refraction than the surrounding medium.

Question 39

Defined as an electrical conductor,or system of conductors,used either for radiating or collecting electromagnetic energy,unguided media uses an ________ to achieve transmission and reception.

Question 40

For ________ media the bandwidth of the signal produced by the transmitting antenna is more important than the medium in determining transmission characteristics.

Question 41

The simplest radiation pattern is produced by the ________ antenna,which is a point in space that radiates power in all directions equally.The actual radiation pattern is a sphere with the antenna at the center.

Question 42

A single orbiting satellite will operate on a number of frequency bands called ________ channels.

Question 43

A form of attenuation known as ________ is when a transmitted signal attenuates over distance because the signal is being spread over a larger and larger area.

Question 44

Used for amateur radio,CB radio,and international broadcasts such as BBC and Voice of America,________ propagation is a signal from an earth based antenna reflected from the ionosphere back down to earth.

Question 45

The ________ frequency band is used for satellite communication,radar,terrestrial microwave links,and wireless local loop.