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Residential Wiring Midterm Exam Term 3 Questions and Answers
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Residential Wiring Midterm Exam Term 3
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Residential Wiring Midterm Exam Term 31. A 20-ampere branch circuit requires _____ AWG conductors, ignoring the effects of
voltage drop.
a. 14 aluminum
b. 14 copper
c. 12 copper
d. 12 aluminum - Answer -12 copper
2. A continuous load shall not exceed _____ of the rating of the branch circuit.
a. 125%
b. 100%
c. 50%
d. 80% - Answer -80%
3. A dual-rated conductor marked THHN/THWN is rated_____ when used in dry
locations.
a. 30°C (86°F)
b. 90°C (194°F)
c. 60°C (140°F)
d. 75°C (167°F) - Answer -90°C
4. A receptacle outlet is _____.
a. a contact device
b. an outlet where one or more receptacles are installed
c. both a and b
d. an outlet intended for the connection of a utilization device - Answer -an outlet where
one or more receptacles are installed.
5. According to _____, unused knockouts and other openings in electrical boxes and
cabinets are required to be closed.
a. both b and c
b. NEC 110.12(A)
c. NEC 408.7
d. Article 100 - Answer -Both b and c
, 6. All of the following terms of electrical equipment are devices,except for a _____.
A. lamp
B. three-way switch
C. receptacle
D. disconnect switch - Answer -A. Lamp
7. An arch flash can produce temperatures of _____F°
a. 3,500
b. 35,000
c. 15,000
d. 25,000 - Answer -35000
8. Article 210 applies to branch circuits, but branch-circuit calculations are covered in
_____.
a. article 230
b. article 220
c. article 250
d. article 240 - Answer -Article 220
9. As defined in Article 100, a dwelling unit has the following feature(s):_____.
a. living, sleeping, basement or storage area
b. none of the above
c. space for eating, sleeping, and recreation
d. permitted provisions for living, sleeping, cooking, and sanitation - Answer -permanent
provisions for living, sleeping, cooking, and sanitation
10. Branch circuit conductors shall have an ampacity _____ the maximum to be served.
a. not less than
b. 125% greater than - Answer -not less than
11. Conductor sizes up through 4/0 AWG are expressed in American Wire Gauge
(AWG). Conductor sizes larger than 4/0 AWG are expressed in _____.
a. kcmil
b. diameter
c. radians
d. metric units - Answer -kcmil
12. Device faceplates must be mounted so as to _____.
a. both b and c
b. seat against the wall surface
c. be parallel to lines in tiles and similar wall finishes
d. cover the opening in the wall - Answer -both b and c
13. Devices are equipment whose primary function is to carry current, not ____.
a. provide over current protection
b. serve a grounding function
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