# Quiz 6: Using Wire Tables and Determining Conductor Sizes

Trade & Technology

Q 1Q 1

If the ambient temperature is above degrees Celsius, a correction factor must be applied to allowable ampacities for conductors.
A) 15
B) 20
C) 25
D) 30

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Multiple Choice

D

Q 2Q 2

What is the maximum operating temperature (in degrees Celsius) for Type SIS insulation?
A) 60
B) 90
C) 200
D) 250

Free

Multiple Choice

B

Q 3Q 3

A factor that determines the amount of current a conductor is permitted to carry is the type of used, which is the nonconductive covering around the wire.
A) insulation
B) raceway
C) busway
D) voltage

Free

Multiple Choice

A

Q 4Q 4

A conductor made out of what material is allowed to carry the most current, assuming that size and insulation type are held constant?
A) copper-clad aluminum
B) silicone
C) aluminum
D) copper

Free

Multiple Choice

Q 5Q 5

If you have a raceway with 35 current-carrying conductors, by what adjustment factor must you multiply the ampacity?
A) 0.2
B) 0.3
C) 0.4
D) 0.5

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Multiple Choice

Q 6Q 6

If conductors are to be used in a location with a higher ambient temperature, the ampacity of the conductor must be ____.
A) kept constant
B) doubled
C) reduced
D) increased by 20 amperes

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Multiple Choice

Q 7Q 7

Twelve 14 AWG copper conductors with type RHW insulation are to be installed in conduit in an area with an ambient temperature of 110 degrees F (43 degrees C). What will be the ampacity of these conductors?
A) 4.1 amperes
B) 8.2 amperes
C) 16.4 amperes
D) 32.8 amperes

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Multiple Choice

Q 8Q 8

The listed ampacities in the Code tables assume that the length of the conductor will not significantly increase the of the circuit.
A) ampacity
B) resistance
C) capacitance
D) inductance

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Multiple Choice

Q 9Q 9

Materials that increase their resistance with an increase of temperature have a coefficient of temperature.
A) decimal
B) constant
C) positive
D) negative

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Multiple Choice

Q 10Q 10

The formula for calculating resistance of a certain length, size, and type of wire is: R = .
A) (K × L)/cmil
B) K/(L × cmil)
C) L/(K × cmil)
D) L × (cmil/K)

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Multiple Choice

Q 11Q 11

Find the resistance of 6 AWG copper wire 550 feet long. Assume a temperature of 20 degrees Celsius.
A) 0.00201 ohm
B) 0.159 ohm
C) 0.218 ohm
D) 4.59 ohm

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Multiple Choice

Q 12Q 12

Currents of a three-phase system are degrees out of phase with each other.
A) 60
B) 90
C) 120
D) 180

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Multiple Choice

Q 13Q 13

The conductors of a single phase are not permitted to be run in metallic conduit because currents will be induced.
A) eddy
B) series
C) parallel
D) superconducting

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Multiple Choice

Q 14Q 14

loss is caused by the continuous aligning and realigning of molecules, which produces heat due to friction.
A) Insulation
B) Hysteresis
C) Short
D) Ground

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Multiple Choice

Q 15Q 15

After the conductors have been installed in conduits or raceways, it is accepted practice to test the installation for grounds and shorts. This test requires a(n) .
A) faradmeter
B) ammeter
C) voltmeter
D) ohmmeter

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Multiple Choice

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Q 18Q 18

An aluminum wire 2250 feet long cannot have a resistance greater than 0.2 ohm. What is the minimum size wire (in circular mils) that may be used?

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Essay

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