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D1 14-20 > D1 14-20 > Flashcards

D1 14-20 Flashcards

0
Q

Malleability

A

The ability of a material to be rolled or hammered into thin sheets

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1
Q

Ductility

A

The ability of a material to be drawn into a wire

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2
Q

Ultimate Strength

A

Mechanical stress a wire can take before breaking

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3
Q

Contact resistance

A

Resistance between two conductors at a given pressure

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4
Q

What conductor material has the best conductance?

A

Silver

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5
Q

Copper resistivity per mil-foot equals?

A

10.4 ohms

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6
Q

Aluminums resistivity per mil-foot is?

A

17 ohms

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7
Q

Line loss is equal to?

A

Watts loss (power loss)

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8
Q

Temperature coefficient formula?

A

Res change= Original res. X coefficient X temp change
And
New res= original res. + res change

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9
Q

Resistance formula

A

R=K X L Divided by CMA
R= resistance
K=10.4 or 17
CMA=circular mils

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10
Q

What is ambient temperature

A

Standard normal temp in that specific area.

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11
Q

Why to use copper

A

Conductance

Oxide resistance

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12
Q

Advantage of stranded wire over solid

A

Flexibility

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13
Q

Disadvantages of aluminum

A

Cold flow

Rapid oxidation

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14
Q

Flexible cords have what type of stranding

A

Bunch

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15
Q

Varnish Cambric for insulator

A

Motor windings and transformers

16
Q

White or grey insulation is for

A

Neutral conductors

17
Q

Green insulation is for

A

Bonding

18
Q

Red/black/or blue wires are assumed to be

A

Live/hot

19
Q

What are mineral insulated cables suitable for

A

Fire-resistant wiring (no flammable materials)

20
Q

What affects the resistance of a conductor?

A

Area of it
Type of material
Length
Temperature

21
Q

What is extra low voltage?

A

30volts or less

22
Q

What is low voltage?

A

31volts to 750volts

23
Q

What is high voltage?

A

Over 750v

24
Q

2 extra low voltage circuits

A

Doorbell

Thermostat

25
Q

Loomex or NMSC

A

Wood structures

300V Max

26
Q

Hazards with PVC

A

Can burn/transmit fire
Toxic smoke
Corrode metal when burnt

27
Q

Voltage drop formula

A

VD= K x L x amps divided by CMA

28
Q

1 MCM equal

A

1CMx 1000

29
Q

One mil equals

A

One-thousandth of an inch

30
Q

A square mill has

A

More area

31
Q

Square mil divided by what equals circular mil

A

.7854

D1 14-20 (1 decks)

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