ET115 Flashcards
Study for final 2019 (160 cards)
1
Q
A square wave is used in digital communications because __________.
A
it is either on or off, which can be used to represent the binary numbering system
2
Q
__________ is the process of superimposing data on a carrier.
A
Modulation
3
Q
What is the value of a resistor with the markings: brown, black, green
A
1 Meg ohm, 20%
4
Q
Of the three types of coaxial cable, which cable is the best for cable TV?
A
RG-6 Quad
5
Q
At frequencies over 100 kHz, coaxial cable becomes ___________.
A
more effective
6
Q
What color is the first pair of a 4-pair cable?
A
White with blue bands and Blue with white bands
7
Q
What is the bend radius for a 4 pair twisted pair cable?
A
4 times
8
Q
CAT5 cable should not be ___________.
A
placed directly on ceiling tiles.
9
Q
The FEXT test ____________.
A
determines the interference of two signals traveling in the same direction at the far end of the cable
10
Q
Crosstalk is expressed in
A
DB
11
Q
A horizontal cabling system employs the _________ topology.
A
star
12
Q
What is a RG8/U cable also called?
A
A thicknet
13
Q
Which of the following will cause channel performance loss?
A
2 feet of CAT5 patch cable replaced with 20 feet of CAT3
14
Q
What is the most common principle for fire protection?
A
Compartmentalization
15
Q
Where can you find a description of product safety related precautions?
A
Material Safety Data Sheets
16
Q
What TIA/EIA standard does telephone systems follow?
A
T568A
17
Q
Attenuation is measured in
A
decibels
18
Q
What happens if you were to use 300 Ohm cable between a 75 Ohm transmitter and a 75 Ohm antenna?
A
There will be loss of power in the system
19
Q
The gap between the penetrating item and the edge of the opening is the_______.
A
Anular Space
20
Q
In reference to the Ethernet, the acronym ATM stands for ________.
A
Asynchronous Transfer Mode
21
Q
What color binder group is used for pairs 426 to 450 of a multipair cable?
A
Yellow Green
22
Q
What does the attenuation test measure?
A
The reduction of signal strength from data transmission
23
Q
T568A recommends that a CAT5 UTP cable should never bend around tighter than __________.
A
four times the cable’s outside diameter
24
Q
Which of the following is electromagnetic interference?
A
Unwanted electrical radiation
25
Category 5e cabling and cabling components are being designed to transmit up to ______ of information at a maximum rate of \_\_\_\_\_\_\_\_\_\_.
1.2 Gbps, 160 Mhz
26
The NEXT measurement indicates the ratio between the __________ and the \_\_\_\_\_\_\_\_\_\_\_.
transmitted signal, crosstalk
27
A telecommunications outlet provides at least two information ports, one for __________ and one for \_\_\_\_\_\_.
voice, data
28
If a conduit has an internal diameter of 2 inches or less, the bend radius must be _______ times the internal conduit diameter.
6
29
The length allowance for the combination of cords/jumpers in a TC and at the work area is ______ meters.
10
30
What category UTP cabling is the most popular in current telecommunications data systems?
Cat 5e
31
Where is pair 3 located in the T568B pin assignment?
Pin 3 and Pin 6
32
Which cable medium will pass the highest bandwidth?
Coaxial Cable
33
What topology does TIA/EIA prefer for residential wiring?
Star
34
What is the maximum pulling tension that can be applied to CAT5 UTP cable?
25 pounds
35
Which of the following should never be done when installing cable runs?
Share bore holes with any type of electrical wiring
36
Telecommunications cables should \_\_\_\_\_\_\_\_\_\_.
be placed in conduits or duct pipes
37
When checking continuity between the center conductor and the braid shield of a RG58 coaxial cable, the resistance should be\_\_\_\_\_\_\_\_\_.
no resistance
38
Where do eye injuries to cable installers occur?
Eye injuries can occur anywhere when doing installation and repair
39
When a horizontal cable run exceeds \_\_\_\_\_\_\_\_, additional TCs should be installed on the same floor.
300 feet
40
What color is the third pair of a 4-pair cable?
Green with white bands and White with green bands
41
What will a telephone do when the tip and ring are reversed?
Probably work, but is really not correct
42
A transceiver, which is connected to a computer with a ________ cable, interfaces with the tapped RG8 cable to transfer data signals to and from computer node.
AUI transceiver
43
TIA/EIA 568A specifies a generic telecommunications cabling system for \_\_\_\_\_\_\_\_\_\_\_.
commercial buildings
44
What is the tip color code order for 25-pair cable?
White, red, black, yellow, and violet
45
Telecommunications systems must be grounded by _______ insulated\_\_\_\_\_\_\_\_\_ ground wires.
No. 6 (or larger), green
46
A CAT5 UTP cable should be bent around more than \_\_\_\_\_\_.
four times the cable's outside diameter
47
How much separation should there be between fluorescent lighting and telecommunications wiring?
5 inches
48
1000baseT standard is drafted to run 1000baseT over __________ cabling.
CAT5
49
The maximum length of a contractor link is _____ meters.
90
50
The difference between the UTP pair assignments described in TIA/EIA 568A and 568B is the location of pairs ______ and \_\_\_\_\_\_\_.
2, 3
51
Certifying a cable system after installation protects \_\_\_\_\_\_\_\_.
the installer and the end-user
52
Category 3 cabling systems are designed and tested to transmit up to _______ of information at a maximum rate of \_\_\_\_\_\_\_.
10 Mbps, 16 Mhz
53
In a 25 pair telephone cable pair, pair 20 is colored:
yellow/slate & slate/yellow
54
What is the value of a resistor with the markings: red, purple, brown, silver
270 ohm, 10%
55
Architectural drawings and drawings used to install cable systems are commonly referred to what?
Blueprints
56
What color is the first pair of a 4-pair cable?
White with blue bands and Blue with white bands
57
What is the only solution to a cable run that is too short?
Replace it with a longer one
58
Which test is NOT one of the field tests required to perform after a CAT5 cable is pulled and terminated?
The impedance test
59
What color would you mark on the pavement showing your proposed digging site to install fiber optic cable?
white
60
Far-End Crosstalk is \_\_\_\_\_\_\_\_\_\_.
the interference of two signals traveling in the same directions within the same cable sheath
61
Why are wires twisted into pairs?
To reduce induction
62
The length of a UTP 4-pair wire segment running between the computer and the wiring closet of a 100baseT4 connection is limited to\_\_\_\_\_\_\_\_\_\_.
100 meters
63
A square wave is used in digital communications because \_\_\_\_\_\_\_\_\_\_\_.
it is either on or off, which can be used to represent the binary numbering system
64
What kind of strength has the ability of a material to resist a force that tends to tear it apart?
Tensile strength
65
How long can a CAT5 cable system be expected to run effectively?
10 years
66
What registered jack interface is designed for digital transmission over Cat-5 cable?
RJ-45
67
What type of fiber optic cable is used for extremely long runs where attenuation must be kept to a minimum?
Single-Mode
68
When hooking up a six pin RJ-14 jack for telephone service, pair one goes on pins:
3 & 4
69
A Category 5 cable may share a conduit with an electrical power conductor \_\_\_\_\_\_\_\_\_\_\_\_\_.
Under no circumstances
70
What are the two distinct types of fiber optic cable that can be used in communication circuits?
Single mode and multimode
71
When is it acceptable to stand on a stool when plugging in a RJ-45 connector?
It is never acceptable
72
Decibel is the unit of measure of \_\_\_\_\_\_\_\_\_\_\_\_.
attenuation
73
The acronym for Near-End Crosstalk is \_\_\_\_\_\_\_\_\_.
NEXT
74
What color is pair 2 in 4-pair cable?
White/Orange and Orange/White
75
What color is pair 4 in a 4-pair cable?
White/Brown and Brown/White
76
What is the only solution to a cable run that is too short?
Replace it with a longer one
77
The difference between a TIA-568A and a TIA-568B RJ-45 connector is:
pair two and three have been reversed
78
The acronym UTP stands for \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
Unshielded Twisted Pair
79
What type of outlet termination should CAT5 networks use?
Insulation Displacement Connection
80
What color binder do pair 177th have?
Red/Green
81
In reference to coaxial cable, the acronym BNC stands for _________________________ Connector.
Bayonet-Neil-Concelman
82
Hearing loss is cumulative and once lost, \_\_\_\_\_\_\_\_\_\_.
your hearing can never be regained
83
What must be done if a segment end of thicknet cable is unused?
Needs to be terminated with a 50-ohm BNC terminator
84
What is the tip color code order for 25-pair cable?
White, red, black, yellow, and violet
85
What is a drip loop?
Used to keep water out of equipment enclosures
86
What TIA/EIA standard does telephone systems follow?
T568A
87
What is the ring color code order for 25-pair cable?
Blue, orange, green, brown, and slate
88
What kind of cable does the cable television industry use as its primary transmission carrier?
RG6, 75-ohm
89
The Wire Map test will\_\_\_\_\_\_\_\_\_\_\_.
identify any incorrect pairing
90
Series 6 coaxial cable has a characteristic impedance of ______ ohms.
75
91
Always leave a \_\_\_\_\_\_-foot service loop of wire at termination points for later additions, changes, or repairs.
one to three
92
Which of the following cables is commonly used as the voice backbone cable in most information transport systems?
Multi-pair copper cable
93
When compared to ring and bus, an advantage of a star topology network is that\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
it is easy to locate a problem in the system
94
Which of the following statements is correct?
Accurate documentation and keeping connections and wire runs tidy during installations are both necessary.
95
Which of the following cable media CANNOT be used for the Ethernet?
RJ11
96
On which pins is pair 3 located when using the T568A wiring scheme?
Pin 1 and pin 2
97
Category ______ pairs can be untwisted up to 3 inches.
3
98
Why are wires twisted into pairs?
To reduce induction
99
Multiplexed signals \_\_\_\_\_\_\_\_\_\_\_.
make the digital transmission faster and more economical
100
What is also known as the contractor model?
The basic link
101
The distance of the cable run from the telecommunications outlet at the work area to the termination point at the horizontal crossconnect in the TC is limited to _____ meters.
90
102
What TIA/EIA standard of wiring do computer workstations follow?
T568B
103
The pairs of CAT5 cable should be untwisted no more than \_\_\_\_\_.
0.5 inch
104
A CAT5 cable with more than 4 pairs of wires shouldn't be bent around tighter than \_\_\_\_\_\_\_\_\_.
ten times the cable's diameter
105
Splitting the signal among the four pairs of CAT3 UTP wiring will utilize \_\_\_\_\_\_\_\_\_.
one transmission pair, one reception pair, and two bi-directional pairs
106
When hooking up an eight pin RJ-45 "B" plug, the color of pair two is:
white/orange and orange
107
Which of the following colors is not a ring color?
Yellow
108
Ethernet operates over \_\_\_\_\_\_\_\_\_\_\_.
coaxial cable and twisted wire
109
Which of the following statements is correct?
Never run power cables and CAT5 cables in the same conduit.
110
In a multistrand optical fiber cable is colored\_\_\_\_\_\_\_.
Yellow
111
The __________ test measures the loss of signal strength as a result of data transmission.
attenuation
112
Near-End Crosstalk is \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
the interference of two signals traveling in opposite directions within the same cable sheath
113
The word modem was derived from _______ and \_\_\_\_\_\_\_\_\_\_.
modulation, demodulation
114
What type of outlet termination should CAT5 networks use?
Insulation Displacement Connection
115
Which of the following is NOT recognized by TIA as a type of backbone cable?
50-ohm RG58
116
Which of the following is true about ladders?
Ladders should not be painted with any type of opaque substance that may obstruct inspection for cracks or defects. Ladders should not be missing any steps or supports.
117
You come to an area in Sacramento where you are going to be installing some underground fiber optic cable. You notice that there are orange spray paint lines with arrows and other markings in the middle of the street. What does the orange paint mean?
CATV
118
What is the maximum pulling tension that can be applied to CAT5 UTP cable?
25 pounds
119
By the end of what year were consumers allowed to connect any FCC-approved equipment to a telephone line?
1977
120
How much separation should there be between fluorescent lighting and telecommunications wiring?
5 inches
121
Cladding size for multimode optical fiber is\_\_\_\_\_\_\_\_.
125
122
Voice signals are typically __________ in nature, while data signals are typically \_\_\_\_\_\_\_\_\_\_\_.
Analog, digital
123
A telecommunications outlet provides at least two information ports, one for ________ and one for \_\_\_\_\_\_\_\_.
voice, data
124
TIA/EIA 568A specifies a generic telecommunications cabling system for \_\_\_\_\_\_\_\_\_.
commercial buildings
125
An advantage of digital data over analog data is that\_\_\_\_\_\_\_\_\_.
it is more resistant to noise
126
When compared to ring and bus, an advantage of a star topology network is that \_\_\_\_\_\_\_\_\_\_\_.
it is easy to locate a problem in the system
127
Category 5 cabling and cabling components are designed to transmit up to ______ of information at a maximum rate of \_\_\_\_\_\_\_.
100 Mbps, 100 MHz
128
What is the primary job of conduit?
To protect the cable from either environmental damage or outright physical abuse
129
The length of a UTP 4-pair wire segment running between the computer and the wiring closet of a 100baseT4 connection is limited to \_\_\_\_\_\_\_\_\_.
100 meters
130
What would probably happen if you tried to measure current that exceeds the current rating of a DMM?
The meter would be destroyed
131
CAT5 cable should not be \_\_\_\_\_\_\_\_\_\_\_\_\_.
placed directly on ceiling tiles
132
The purpose of the ANSI/TIA/EIA T568A standard is to \_\_\_\_\_\_\_\_\_\_\_\_\_.
provide means for the planning and installing of a structured cabling system for commercial buildings
133
Where is a bridge clip used in telecommunications circuits?
It is used on a 66 punch down block
134
A CAT5 cable with more than 4 pairs of wires shouldn't be bent around tighter than \_\_\_\_\_\_\_\_\_\_.
ten times the cable's diameter
135
What registered jack interface is designed for digital transmission over Cat-5 cable?
RJ-45
136
An electrical source, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.
Separately Derived System
137
A conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system.
Grounding electrode conductor
138
The common point on a wye connection in a polyphase system or midpoint on a single phase, 3-wire system, or midpoint of a single-phase portion of a three-phase delta system, or midpoint of a 3-wire, direct current system.
Neutral point
139
The conductive path(s) that provides a ground-fault current path and connects to normally non-current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both.
Equipment grounding conductor
140
The connection between the grounding circuit conductor and the equipment grounding conductor at the service.
Main bonding jumper
141
Connected (connecting) to ground or to a conductive body that extends the ground connection.
Grounded
142
An intentionally constructed, low impedance electrically conductive path designed and intended to carry current under ground-fault conditions from the point of a ground fault on a wiring system to the electrical supply source.
Effective ground-fault current path
143
A device that provides a means for connecting bonding conductors for communications systems to the grounding electrode system.
Intersystem bonding termination
144
A system or circuit conductor that is intentionally grounded.
Grounded conductor
145
The conductor connected to the neutral point of a system that is intended to carry current under normal conditions.
Neutral conductor
146
The connection between two or more portions of the equipment grounding conductor
Equipment bonding jumper
147
A conductor installed on the supply-side of a service or within a service equipment enclosure(s), or for a separately derived system, that ensures the required electrical conductivity between metal parts required to be electrically connected
Supply-side bonding jumper
148
A conducting object through which a direct connection to earth is established
Grounding electrode
149
The connection between the grounded circuit conductor and the supply-side bonding jumper or the equipment grounding conductor, or both, at a separately derived system.
System bonding jumper
150
Deleted during the processing of the 2011 NEC. Too close in meaning to other terms related to grounding and bonding.
Grounding conductor
151
A conductive element such as conduit, cable or wire that extends from the point where an earth connection is made at one or more grounding electrodes to another point on the electrical system where a switchboard, panelboard, junction or pull box or a grounding receptacle is properly connected "extends the earth connection"
Grounded
152
Connected to establish electrical continuity and conductivity.
Bonded
153
Connected to ground without inserting any resistor or impedance device.
Solidly grounded
154
Grounded (grounding) "means connected (connecting) to earth or to some conductive body that extends the ground connection.
Grounded improperly
155
A conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.
Equipment grounding conductor
156
The ________________ JFET uses a positive drain supply voltage (VDD).
n-channel
157
The depletion mode MOSFET is a
a normally ON device
158
E-MOSFETs can operate in
the enhancement mode only
159
Once in saturation, a further increase in base current will
not affect the collector current
160
For a D=MOSFET the cutoff voltage VGS(off) is the
the gate-source voltage that makes the drain current minimum
