Transmission Media Questions

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11.

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

Correct Answer: C

None.

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12.

Signals with a frequency below 2 MHz use _______ propagation.

A

ground

B

sky

C

line-of-sight

D

none of the above

Correct Answer: A

None.

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13.

Signals with a frequency between 2 MHz and 30 MHz use ______ propagation

A

ground

B

sky

C

line-of-sight

D

none of the above

Correct Answer: B

None.

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14.

Signals with a frequency above 30 MHz use _______propagation

A

ground

B

sky

C

line-of-sight

D

none of the above

Correct Answer: C

None.

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15.

A parabolic dish antenna is a(n) _______ antenna.

A

omnidirectional

B

bidirectional

C

unidirectional

D

horn

Correct Answer: C

None.

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16.

A(n) _____ medium provides a physical conduit from one device to another.

A

guided

B

unguided

C

either (a) or (b)

D

none of the above

Correct Answer: B

None.

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17.

________ cable consists of two insulated copper wires twisted together.

A

Coaxial

B

Fiber-optic

C

Twisted-pair

D

none of the above

Correct Answer: C

None.

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18.

_______ cable is used for voice and data communications.

A

Coaxial

B

Fiber-optic

C

Twisted-pair

D

none of the above

Correct Answer: C

None.

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19.

_________ consists of a central conductor and a shield.

A

Coaxial

B

Fiber-optic

C

Twisted-pair

D

none of the above

Correct Answer: A

None.

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20.

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

A

Coaxial

B

Fiber-optic

C

Twisted-pair

D

none of the above

Correct Answer: B

None.

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