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1 | |
The VLF and LF bands use _______ propagation for communications. |
|
| | A) | Space |
| | B) | Ground |
| | C) | Sky |
| | D) | Line of sight |
|
2 | |
Category 1 UTP cable is most often used in _______ networks. |
|
| | A) | Infrared |
| | B) | Telephone |
| | C) | Fast Ethernet |
| | D) | Traditional Ethernet |
|
3 | |
BNC connectors are used by _______ cables. |
|
| | A) | Fiber-optic |
| | B) | UTP |
| | C) | STP |
| | D) | Coaxial |
|
4 | |
Which of the following is not a guided medium? |
|
| | A) | Twisted-pair cable |
| | B) | Fiber-optic cable |
| | C) | Atmosphere |
| | D) | Coaxial cable |
|
5 | |
In an environment with many high-voltage devices, the best transmission medium would be _________. |
|
| | A) | Twisted-pair cable |
| | B) | Coaxial cable |
| | C) | The atmosphere |
| | D) | Optical fiber |
|
6 | |
_______ cable consists of an inner copper core and a second conducting outer sheath. |
|
| | A) | Coaxial |
| | B) | Twisted-pair |
| | C) | Fiber-optic |
| | D) | Shielded twisted-pair |
|
7 | |
In fiber optics, the signal source is _______ waves. |
|
| | A) | Very low-frequency |
| | B) | Light |
| | C) | Radio |
| | D) | Infrared |
|
8 | |
Smoke signals are an example of communication through _______. |
|
| | A) | A guided medium |
| | B) | A refractive medium |
| | C) | An unguided medium |
| | D) | A small or large medium |
|
9 | |
Which of the following primarily uses guided media? |
|
| | A) | Cellular telephone system |
| | B) | Satellite communications |
| | C) | Local telephone system |
| | D) | Radio broadcasting |
|
10 | |
What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable? |
|
| | A) | Outer conductor |
| | B) | Inner conductor |
| | C) | Diameter of cable |
| | D) | Insulating material |
|
11 | |
The RG number gives us information about _______. |
|
| | A) | Optical fibers |
| | B) | Twisted pairs |
| | C) | Coaxial cables |
| | D) | All the above |
|
12 | |
Transmission media are usually categorized as _______. |
|
| | A) | Guided or unguided |
| | B) | Fixed or unfixed |
| | C) | Determinate or indeterminate |
| | D) | Metallic or nonmetallic |
|
13 | |
The _______ is an association that sponsors the use of infrared waves. |
|
| | A) | EIA |
| | B) | IrDA |
| | C) | FCC |
| | D) | PUD |
|
14 | |
In an optical fiber, the inner core is _______ the cladding. |
|
| | A) | Less dense than |
| | B) | Denser than |
| | C) | The same density as |
| | D) | Another name for |
|
15 | |
The inner core of an optical fiber is _______ in composition. |
|
| | A) | Copper |
| | B) | Bimetallic |
| | C) | Glass or plastic |
| | D) | Liquid |
|
16 | |
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) | Refraction |
| | B) | Reflection |
| | C) | Incidence |
| | D) | Criticism |
|
17 | |
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) | Single-mode |
| | B) | Multimode step-index |
| | C) | Multimode graded-index |
| | D) | Multimode single-index |
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18 | |
_______ is the propagation method subject to the greatest distortion. |
|
| | A) | Single-mode |
| | B) | Multimode step-index |
| | C) | Multimode graded-index |
| | D) | Multimode single-index |
|
19 | |
In _______ propagation, the core is of varying densities. |
|
| | A) | Single-mode |
| | B) | Multimode step-index |
| | C) | Multimode graded-index |
| | D) | Multimode single-index |
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20 | |
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 |
|
21 | |
Transmission media are closest to the _______ layer. |
|
| | A) | Application |
| | B) | Physical |
| | C) | Network |
| | D) | Transport |
|
22 | |
Radio wave and microwave frequencies range from _______. |
|
| | A) | 3 to 300 KHz |
| | B) | 300 KHz to 3 GHz |
| | C) | 3 KHz to 300 GHz |
| | D) | 3 KHz to 3000 GHz |
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23 | |
Optical fibers, unlike wire media, are highly resistant to _______. |
|
| | A) | High-frequency transmission |
| | B) | Low-frequency transmission |
| | C) | Refraction |
| | D) | Electromagnetic interference |
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24 | |
In _______ propagation, low-frequency radio waves hug the earth. |
|
| | A) | Space |
| | B) | Ground |
| | C) | Sky |
| | D) | Line of sight |
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25 | |
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 |
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26 | |
A parabolic dish antenna is a(n) _______ antenna. |
|
| | A) | Omnidirectional |
| | B) | Bidirectional |
| | C) | Horn |
| | D) | Unidirectional |