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Elementary Electrical Engineering (AC/DC) > Electrical Wiring > Flashcards

Electrical Wiring Flashcards

1
Q

a single conductor which material is most commonly being copper or aluminum

A

wire

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2
Q

two or more insulated wires wrapped in one jacket

A

cable

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3
Q

types of electrical cable

A

twisted pair cable, multi conductor cable, coaxial cable, fiber optic cable

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4
Q

has two cables that are twisted across each other

A

twisted pair cable

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5
Q

this cable is best suited for carrying signals

A

twisted pair cable

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6
Q

twisting in twisted pair cable can avoid noise that is produced by __________

A

magnetic coupling

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7
Q

generally used in telecommunication and data communication

A

twisted pair cable

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8
Q

has two or more conductors that are insulated from each other

A

multi conductor cable

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9
Q

purpose is to protect signal integrity by reducing hum, noise, and crosstalk

A

multi conductor cable

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10
Q

its applications include computers, communications, instrumentation, sound, control, audio, and data transmission

A

multi conductor cable

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11
Q

What are multi conductor and twisted pair cables called?

A

balanced line configuration cables

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12
Q

composed of an inner solid conductor surrounded by a paralleled outer foil conductor that is protected by an insulating layer

A

coaxial cable

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13
Q

what separates the two conductors in a coaxial cable?

A

insulating dielectric

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14
Q

generally used in TV cables

A

coaxial cable

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15
Q

called an unbalanced line as the signal on the two conductors is not same which result in interference

A

coaxial cable

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16
Q

performance is more stable than a twisted pair cable

A

coaxial cable

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17
Q

has a much greater bandwidth than metal cables; can carry more data

A

fiber optic cable

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18
Q

transmits signals by a bundle of glass threads

A

fiber optic cable

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19
Q

less susceptible to interference

A

fiber optic cable

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20
Q

What are the two reasons why fiber optic cables are increasingly being used instead of traditional copper cables despite being expensive?

A

can carry more data, less susceptible to inteference

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21
Q

Types of Electrical Wire

A

solid wire, stranded wire

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22
Q

a single conductor that is either bare or insulated by a protective-colored sheath

A

solid wire

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23
Q

offers low resistance and are perfect for use in higher frequencies

A

solid wire

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24
Q

consists of thon strands of wires twisted together in a sheath

A

stranded wire

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25
more flexible and have larger cross-sectional area than solid wires for the same current carrying capacity
stranded wire
26
Aircraft wire is measured by the _________, with the larger numbers representing the ______ wires.
American Wire Gauge (AWG) System, smaller
27
also used to describe stranded wire
AWG
28
The AWG of a stranded wire represents the sum of the ________ of the individual strands; the gaps between the strands are _______.
cross-sectional areas, not counted
29
When stranded wires are made with circular strands, these gaps occupy about ______ of the wire area, thus requiring the overall bundle diameter to be about ______ larger than a solid wire of equal gauge.
25%, 13%
30
Stranded wires are specified with three numbers, what are these?
overall AWG size, number of strands, AWG size of a strand
31
What separates the number of strands and the AWG of a strand?
slash
32
The smallest size wire normally used in aircraft is ______ wire, which has a diameter of about ______.
22-gauge, 0.025 inch
33
Conductors carrying large amounts of current are typically of the ______, or ______ size, and have a diameter of about _____.
0000, 4-aught, 0.52 inch
34
What determines the amount of current a wire is capable of carrying?
its cross-sectional area
35
One mil is equal to?
0.001 inches or 1/1000 inches
36
125 mils = ______ inches
0.125
37
To find the cross-sectional area of a round conductor in circular mils, what do we do?
square the conductor's diameter
38
unit of measure for square or rectangular conductors
square mil
39
To determine the cross-sectional area of such a conductor in square mils, what do we do?
multiply the conductor's thickness by its width
40
1 circular mil = _____ square mil
0.7854
41
To convert a circular mil area to a square mil area, what do we do?
multiply the area in circular mils by 0.7854 mil
42
To convert a square mil area to a circular mil area, what do we do?
divide the area in square mils by 0.7854
43
factors to consider in new wire installations
system operating voltage, allowable voltage drop, continuous or intermittent basis
44
Identification markings should be placed at each end of the wire and at _________ interval along the length of the wire.
12 to 15 inches
45
Wires less than ____ in length need not be identified.
3 inches
46
Wires ______ in length should be identified approximately at the center.
3 to 7 inches
47
Two methods of marking wire or cable
direct marking, indirect marking
48
accomplished by printing the cable's outer covering
direct marking
49
accomplished by printing a heat shrinkable sleeve and installing the printed sleeve on the wire or cables outer covering
indirect marking
50
Indirectly-marked wire or cable should be identified with printed sleeves at each end and at intervals not longer than ______.
6 feet
51
The individual wires inside a cable should be identified within ______ of their termination.
3 inches
52
The identification marking should identify the wire with regards to what?
type of circuit, location within the circuit, wire size
53
2 P 215 A 4 N ALUM What is 2?
unit number
54
2 P 215 A 4 N ALUM What is P?
circuit function letter
55
2 P 215 A 4 N ALUM What is 215?
wire number
56
2 P 215 A 4 N ALUM What is A?
wire segment letter
57
2 P 215 A 4 N ALUM What is 4?
wire size number
58
2 P 215 A 4 N ALUM What is N?
ground, phase, or thermocouple letter
59
2 P 215 A 4 N ALUM What is ALUM?
suffix
60
used to identify the circuit function
circuit function letter
61
used to differentiate between wires in a circuit
wire number (s)
62
Wires with the same circuit function having a common terminal connection or junction will have the _____ wire number but _____ segment letters.
same, different
63
a conductor between two terminals or connections; used to differentiate between conductor segments in a particular circuit
wire segment letter
64
letters not used as segment letters
I and O
65
Double letters are used for wire segments when more than ____ segments are required.
24
66
used to identify the size (AWG) of the wire
wire size number
67
For coaxial cables and thermocouple wires, a _____ is used in lieu of the wire size number.
dash
68
used as a suffix to the wire identification code to identify any wire or cable that completes the circuit to the ground network
N
69
used as a suffix on the wire identification code to identify phase of wires that are in the three-phase power distribution wiring of AC systems
A, B, or C
70
shall be used as a suffix on the cable identification code to identify the ungrounded wire or cable that is in a single-phase system
V
71
Chromel consists of
90% nickel and 10% chromium
72
suffix for Chromel
CHROM
73
suffix for Constantan
CONS
74
Constantan consists of
55% copper and 45% nickel
75
suffix for Alumel
ALML
76
Alumel consists of
95% nickel, 2% aluminum, 2% manganese, 1% silicon
77
suffix for copper
COP
78
suffix for iron
IRON
79
The inside diameter of the conduit must be _____ larger than the maximum diameter of the wire bundle.
25%
80
What does the nominal diameter of a conduit represent?
conduit's outside diameter
81
method of installation that provides the best mechanical protection for electrical wiring
conduit
82
quickest and easiest way to install wiring
open wiring
83
allows easy access when troubleshooting or servicing individual circuits
open wiring
84
All of the wire bundles installed in aircraft should be routed so they are at least _____ away from any control cable and will not interfere with any moving components.
3 inches
85
a method of intercepting electrical energy and shunting it to electrical ground
shielding
86
term used to describe the squeezing of a terminal around a wire to secure the wire and provide a high-quality electrical connection
crimping
87
process of cutting the protective insulation of a wire and gently pulling it from the end
stripping the wire

Elementary Electrical Engineering (AC/DC) (9 decks)

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