Question 1

Multioutlet branch-circuit ratings are limited to 15-, 20-, 30-, 40-, and 50-ampere except on premises, where they may have a higher rating.

Accepted Answer

A)  government
B)  residential
C)  commercial
D)  industrial D

Question 2

When all conductors of the same alternating-current circuit are in the same raceway, the magnetic flux around each conductor the magnetic flux of the other circuit conductors.

Accepted Answer

A)  adds to
B)  cancels out
C)  reverses
D)  doubles B

Question 3

Law proves that in a given circuit, the higher the impedance, the lower the current flow.

Accepted Answer

A)  Ohm's
B)  Watt's
C)  Faraday's
D)  Maxwell's A

Question 4

On what is the resistance of a conductor dependent?

Accepted Answer

The answer of On what is the resistance of a...

Question 5

During the process of laying out an electrical system, when are branch circuits assigned?

Accepted Answer

The answer of During the process of laying out an...

Question 6

For motors, the OCPDs are .

Accepted Answer

A)  reverse-time fuses
B)  inverse-time fuses
C)  inverse-time circuit breakers
D)  reverse-time circuit breakers

Question 7

Although several different types of insulation are listed in the NEC, there are only three different temperature ratings: 60 degrees C, 75 degrees C, and degrees C.

Accepted Answer

A)  80
B)  85
C)  90
D)  110

Question 8

Where would insulation with high-temperature rating be needed and why?

Accepted Answer

The answer of Where would insulation with high-temperature rating be...

Question 9

The allowable ampacity of a 4 AWG THHN conductor is 95 amperes.If we have four 4 AWG THHN conductors, what is the adjusted ampacity?

Accepted Answer

A)  48
B)  63
C)  76
D)  95

Question 10

Whenever a grouping of more than current-carrying conductors exists, an adjustment factor from NEC Table 310.15(B)(3)(a) must be applied.

Accepted Answer

A)  two
B)  three
C)  four
D)  five

Question 11

What is thermoset insulation?

Accepted Answer

The answer of What is thermoset insulation?...

Question 12

In general, the letter-type designation R formerly referred to a -based covering and now indicates thermoset insulation.

Accepted Answer

A)  rhodium
B)  rubidium
C)  rayon
D)  rubber

Question 13

NEC Table 310.15(B)(16) places the wires available for building construction into two categories: and aluminum.

Accepted Answer

A)  copper
B)  gold
C)  silver
D)  platinum

Question 14

When sizing conductors and overcurrent protection, you must take 100 percent of the noncontinuous loads plus percent of the continuous loads.

Accepted Answer

A)  75
B)  80
C)  100
D)  125

Question 15

Count the neutral conductor of a 4-wire, 3-phase, wye-connected circuit when the major portion of the load is electric discharge lighting (fluorescent, mercury vapor, high-pressure sodium, etc.), data processing, and other loads where the neutral conductor carries current.

Accepted Answer

A)  grounding
B)  traveler
C)  third harmonic
D)  unbalanced

Question 16

Several factors or conditions can cause conductors to overheat, but often overlooked is the possibility of .

Accepted Answer

A)  induction heating
B)  ambient temperature
C)  the size of conductors
D)  grounding

Question 17

Metal raceways not properly grounded could become " " and present a shock hazard.

Accepted Answer

A)  branched
B)  live
C)  shorted
D)  charred

Question 18

If the ambient temperature anywhere along the length of a raceway is less than 78 degrees F or higher than degrees F, the ampacity of the conductors in the raceway, or cable, must be modified by a correction factor.

Accepted Answer

A)  80
B)  84
C)  86
D)  90

Question 19

How does oxidation affect aluminum conductors, and how can this be averted?

Accepted Answer

The answer of How does oxidation affect aluminum conductors, and...

Question 20

An exception to the rule where two different temperatures are encountered for the same conductors permits the application of the higher ampacity (lower temperature) if the length of the conductors that enter a higher temperature is not more than 10 ft (3.0 m) or not more than 10% of the total circuit length.

Accepted Answer

A)  circuit derating
B)  ampacity derating
C)  ampacity rating
D)  flux rating

Exam 4: Branch Circuits