ESAT Forouzan - Chapter 7: Transmission Media Flashcards
Transmission media are usually categorized as _____.
a. Fixed or unfixed
b. Guided or unguided
c. Determinate and indeterminate
d. Metallic and nonmetallic
b. Guided or unguided
Transmission media are closest to the ______ layer
a. Physical
b. Network
c. Transport
d. Application
a. Physical
Category 1 UTP cable is most often used in _____ networks.
a. Fast Ethernet
b. Traditional Ethernet
c. Infrared
d. Telephone
d. Telephone
BNC connectors are used by _____ cables.
a. UTP
b. STP
c. Coaxial
d. Fiber-Optic
c. Coaxial
_____ cable consists of an inner copper and a second conducting outer sheath.
a. Twisted pair
b. Coaxial
c. Fiber-Optic
d. Shielded twisted pair
b. Coaxial
In fiber optics, the signal source is _____ waves.
a. Light
b. Radio
c. Infrared
d. Very low-frequency
a. Light
Smoke signal are example of communication though _____.
a. A guided medium
b. An unguided medium
c. A refractive medium
d. A small or large medium
b. An unguided medium
Which of the following primarily uses guided media?
a. Cellular telephone system
b. Local Telephone System
c. Satellite communications
d. Radio Broadcasting
b. Local Telephone System
Which of the following is not a guided medium?
a. Twisted-pair cable
b. Coaxial cable
c. Fiber-Optic Cable
d. Atmosphere
d. Atmosphere
In an environment with many high-voltage devices, the best transmission medium would be _____.
a. Twisted-pair cable
b. Coaxial cable
c. Optical cable
d. The Atmosphere
c. Optical cable
What is the major factor that makes coaxial-cable less susceptible to noise than twisted-pair cable?
a. Inner conductor
b. Diameter of cable
c. Outer conductor
d. Insulating material
c. Outer conductor
The RG number gives us information about _____.
a. Twisted pairs
b. Coaxial cable
c. Optical fibers
d. All of the above
b. Coaxial cable
In an optical fiber, the inner core is _____ the cladding.
a. Denser than
b. Less dense than
c. The same density as
d. Another name for
a. Denser than
The inner core of an optical fiber is _____ in composition.
a. Glass or plastic
b. Copper
c. Bimetalic
d. Liquid
a. Glass or plastic
Optical fibers, unlike wire media, are highly resistant to _____.
a. High-frequency transmission
b. Low-frequency transmission
c. Electromagnetic interference
d. Refraction
c. Electromagnetic interference
When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _____ occurs.
a. Reflection
b. Refraction
c. Incidence
d. Criticism
a. Reflection
When the angle of incidence is _____ the critical angle, the light beam bends along the interface.
a. More than
b. Less than
c. Equal to
d. None of the above
c. Equal to
In _____ propagation, the beam of propagated light is almost horizontal, and the low-density core has a small diameter compared to the cores of the other propagation modes.
a. Multimode step-index
b. Multiple graded-index
c. Multimode single-index
d. Single-mode
d. Single-mode
_____ is the propagation method subject to the greatest distortion.
a. Multimode step-index
b. Multimode Graded-index
c. Multiple single-index
d. Single-mode
a. Multimode step-index
In _____ propagation, the core is varying densities.
a. Multimode step-index
b. Multimode graded-index
c. Multimode single-index
d. Single-mode
b. Multimode graded-index
When we talk about unguided media, usually we are referring to _____.
a. Metallic wires
b. Nonmetallic wires
c. The air
d. None of the above
c. The air
Radio wave and microwave frequencies range from ______.
a. 3 to 300 KHz
b. 300 KHz to 300 GHz
c. 3 KHz to 300 GHz
d. 3 KHz to 3000 GHz
c. 3 KHz to 300 GHz
In _____ propagation, low frequency radio waves hug the earth.
a. Ground
b. Sky
c. Line of sight
d. Space
a. Ground
The VLF and LF bands use _____ propagation for communications.
a. Ground
b. Sky
c. Line of sight
d. Space
a. Ground
A parabolic dish antenna is a(n) _____ antenna.
a. Omnidirectional
b. Bidirectional
c. Unidirectional
d. Horn
c. Unidirectional
The _____ is an association that sponsors the use of infrared waves.
a. IrDA
b. EIA
c. FCC
d. PUD
a. IrDA
