Transmission Media Are Usually Categorized As

Transmission media are usually categorized as _______. A)

fixed or unfixed guided or unguided

B) C)

determinate or indeterminate

D)

2   CORRECT

metallic or nonmetallic

Transmission media lie below the _______ layer. A)

physical

B)

network

C)

transport

D)

3   INCORRECT

application

 _______ cable consists of an inner copper copper core and a second second conducting outer sheath. A)

Twisted-pair B)

Coaxial

C) D)

4   INCORRECT

Fiber-optic

Shielded twisted-pair

n fiber optics! the signal is _______ _______ wa"es. A) B) C)

light radio infrared

D)

5   INCORRECT

"ery low-fre#uency

$hich of the following primarily uses guided media% A)

cellular telephone system

B)

local telephone system

C)

satellite communications radio broadcasting

D)

6   INCORRECT

$hich of the following is not a guided medium% twisted-pair cable

A) B) C) D)

7   INCORRECT

coaxial cable fiber-optic cable atmosphere

$hat is the ma&or factor that makes coaxial cable less susceptible to noise than twisted-pair cable% A) B) C) D)

inner conductor diameter of cable outer conductor insulating material

8   INCORRECT

n an optical fiber! the inner core is _______ the cladding. A)

denser than less dense than

B) C)

the same density as another name for

D)

9   INCORRECT

The inner core of an optical fiber is _______ in composition. glass or plastic

A) B) C)

copper bimetallic

D)

1 0

INCORRECT

$hen a beam of light tra"els 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)

1 1

INCORRECT

li#uid

criticism

$hen the angle of incidence is _______ the critical angle! the light beam bends along the interface.

A)

more than

less than

B) C)

none of the abo"e

D)

1 2

e#ual to

Signals with a fre#uency below ' ()z use _______ propagation. INCORRECT

ground

A) B) C)

line-of-sight none of the abo"e

D)

1 3

sky

Signals with a fre#uency between ' ()z and *+ ()z use ______ propagation. INCORRECT

ground

A) B)

line-of-sight

C) D)

1 4

sky

none of the abo"e

Signals with a fre#uency abo"e *+ ()z use _______propagation. INCORRECT

A)

ground B)

C)

line-of-sight

sky

D)

1 5

none of the abo"e

, parabolic dish antenna is an _______ antenna. CORRECT

A)

omnidirectional bidirectional

B) C)

unidirectional horn

D)

1 6

,n _____ medium pro"ides a physical conduit from one de"ice to another. CORRECT

A) B) C)

unguided either a or b

D)

1 7

guided

none of the abo"e

 ________ cable consists of two insulated copper wires twisted together. CORRECT

A) B) C) D)

Coaxial Fiber-optic Twisted-pair

none of the abo"e

1 8

 _______ cable is used for "oice and data communications. INCORRECT

A)

Fiber-optic

B) C)

Twisted-pair none of the abo"e

D)

1 9

 __________ consists of a central conductor and a shield. CORRECT

A) B) C) D)

2 0

Coaxial

Coaxial Fiber-optic Twisted-pair

none of the abo"e

 _____ cable can carry signals of higher fre#uency ranges than _____ cable. INCORRECT

A)

Twisted-pair/ fiber-optic

B)

Coaxial/ fiber-optic

C)

Coaxial/ twisted-pair

D)

none of the abo"e

2 1

INCORRECT

 ______ cables are composed of a glass or plastic inner core surrounded by cladding! all encased in an outside &acket.

A) B)

Fiber-optic

C)

Twisted-pair

D)

2 2

none of the abo"e

 ______ cables carry data signals in the form of light. INCORRECT

A) B) C)

INCORRECT

Fiber-optic Twisted-pair

n a fiber-optic cable! the signal is propagated along the inner core by  _______.

A)

reflection

B)

refraction

C) D)

2   INCORRECT

Coaxial

none of the abo"e

D)

2 3

Coaxial

modulation none of the abo"e

 _________ media transport electromagnetic wa"es without the use of a physical conductor.

4 A)

0uided 1nguided

B) C)

3one of the abo"e

D)

2 5

2ither a or b

4adio wa"es are _________. INCORRECT

A)

omnidirectional

B)

unidirectional bidirectional

C) D)

2 6

none of the abo"e

(icrowa"es are _________. INCORRECT

A) B) C) D)

2 7

INCORRECT

omnidirectional unidirectional bidirectional none of the abo"e

 _______ are used for cellular phone! satellite! and wireless 5,3 communications.

A)

4adio wa"es

B) C) D)

2 8

INCORRECT

(icrowa"es nfrared wa"es none of the abo"e

 ________ are used for short-range communications such as those between a 6C and a peripheral de"ice.

A) B) C) D)

4adio wa"es (icrowa"es nfrared wa"es none of the abo"e