Residential Wireman Electrical Wiring Midterm Exam Term 3 With Complete Solution

1. 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 - Answers 12 copper 2. A continuous load shall not exceed _____ of the rating of the branch circuit. a. 125% b. 100% c. 50% d. 80% - Answers 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) - Answers 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 - Answers 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 - Answers 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 - Answers A. Lamp 7. An arch flash can produce temperatures of _____F° a. 3,500 b. 35,000 c. 15,000 d. 25,000 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 c. control power d. utilize electric energy - Answers utilize electric energy 14. For a given conductor size, which material has the greater ampacity? a. copper-clad aluminum b. aluminum c. copper d. both b and c - Answers Copper