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Nevada C-3 Carpentry Contractor Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
Nevada C- 3 Carpentry Contractor Exam. ✅ Part 1: Summarized Exam Coverage – Nevada C-3 Carpentry Contractor Nevada C-3 Classification (NAC 624.210) The Nevada State Contractors Board (NSCB) issues the C-3 license for Carpentry, Maintenance and Minor Repairs. This classification includes five subclassifications : C-3a (Carpentry and Repairs) : Rough framing, form work, subflooring, siding, exterior stairs/railings, roof decking, truss members/sheathing, and the fabrication/installation of wood and wood products for finishing (doors, windows, cabinets, fixtures). C-3b (Finish Carpentry) : Installation, repair, and finishing of cabinets, casing, baseboards, countertops, wood flooring, and millwork. C-3c (Insulation and Weather Stripping) : Installation of building insulation, weather stripping, caulking, and firestop systems. C-3d (Overhead Doors) : Erection and installation of guides, tracks, counterweights, controls, and all equipment for overhead doors. C-3e (Drywall) : Installation, taping, finishing of drywall, gypsum panels, acoustical tile, and metal stud framing for non-structural partitions. Exam Requirements
- Pre-approval Required. Applicants must document a minimum of 4 years of experience within the past 10 years , submit 4 reference certificates, and pass a background check.
- Two Exams :
- Contractor Management Survey Exam (Business & Law) – 60 questions, 2 hours, 75% passing.
- C-3 Trade Exam – 56 questions (C-3/ C-3a / C-3b), 2 hours, approx. 70% passing.
- Open Book. The exams are open-book, requiring the candidate to be proficient in navigating reference materials quickly. Approved Reference Materials (Trade Exam) The C-3 trade exam is based on the following references :
- 2018 International Building Code (IBC)
- 29 CFR OSHA 1926 (Construction Industry Regulations)
- Carpentry & Building Construction (2016)
- Gypsum Construction Handbook
- Guide to Handling, Installing, Bracing Wood Trusses (BCSI)
- Finish Carpenter’s Manual Exam Content Areas (Trade) Based on test providers, the primary topics covered in the C-3 exam include :
- Safety (OSHA) : Fall protection (6 feet threshold), PPE, ladder safety, hazcom.
- Rough Carpentry : Framing, floor joists, rafters, trusses, sheathing, subflooring, headers, sill plates, blocking.
- Finish Carpentry : Stairs (rise/run), cabinetry, baseboards, casing, crown molding, flooring.
- Windows & Doors : Installation, flashing, weather-stripping, thresholds.
- Drywall : Hanging, taping, finishing levels, screw spacing.
- Building Code (IBC) : Egress, headroom, fire blocking, structural loads.
- Blueprint Reading : Symbols, scaling, dimension interpretation.
- Estimating : Material takeoffs, calculating board feet, stud counts. 1. According to OSHA 1926.501, at what minimum height must fall protection be provided for employees engaged in residential construction activities? A) 4 feet B) 6 feet C) 10 feet D) 12 feet Answer: B — OSHA 29 CFR 1926.501(b)(13) requires fall protection at 6 feet for residential construction. 2. What is the primary purpose of a sill plate in residential framing? A) To support roof rafters at the peak B) To anchor the wall framing to the foundation C) To distribute loads across floor joists D) To provide backing for drywall Answer: B — The sill plate is bolted to the foundation and serves as the structural base for the wall framing, anchoring the building securely.
5. What is the standard spacing for wall studs in most residential construction? A) 12 inches on center B) 16 inches on center C) 19.2 inches on center D) 24 inches on center Answer: B — Sixteen inches on center is the most common stud spacing to provide adequate structural support. 6. For a stairway, what is the maximum allowable riser height under most residential building codes? A) 7 inches B) 7.75 inches (approx 7 3/4 inches) C) 8 inches D) 8.25 inches Answer: B — The IRC/IBC typically limit risers to a maximum of 7 3/4 inches for residential stairs. 7. A floor plan shows a wall that will be framed with 2x4s at 16 inches o.c. The wall is 24 feet long. How many studs are required (excluding corners)? A) 16
B) 17
C) 18
D) 19
Answer: D — (24 ft * 12 inches) / 16 = 18 spaces, therefore 19 studs are required.
8. What is the primary function of a header above a window or door opening in a load-bearing wall? A) To provide a nailing surface for trim B) To transfer the structural loads above the opening to the adjacent jack studs C) To act as a fire stop D) To support the window or door frame Answer: B — Headers carry the weight of the structure above the opening and distribute it down the sides of the opening. 9. According to OSHA, what is the correct ratio for the base-to-wall distance when setting up an extension ladder? A) 1 foot out for every 2 feet high B) 1 foot out for every 4 feet high (1/4 rule) C) 1 foot out for every 3 feet high
D) Knot Answer: C — A split runs completely through the wood, creating a structural weakness.
12. The carpenter’s square is used for what primary function? A) Cutting circles B) Laying out angles and checking squareness C) Sanding rough edges D) Drilling pilot holes Answer: B — A framing square is essential for laying out rafters, stairs, and checking the squareness of frames. 13. In blueprint reading, what does a solid double line with a diagonal line through it typically represent? A) A window B) A door C) A wall section D) A stairwell Answer: B — A double line with a diagonal is the standard architectural symbol for a door swing.
14. According to OSHA 1926.502, what is the minimum breaking strength of a lanyard used in a Personal Fall Arrest System (PFAS)? A) 2,500 pounds B) 3,600 pounds C) 5,000 pounds D) 10,000 pounds Answer: C — Lanyards used in PFAS must have a minimum breaking strength of 5,000 pounds. 15. What does the abbreviation "o.c." stand for in construction framing? A) Outside corner B) Over center C) On center (the distance from the center of one framing member to the center of the next) D) Opposite corner Answer: C — "On center" refers to the standard measurement between the centers of studs, joists, or rafters. 16. Which of the following is the job name for the temporary framework that braces a wall before sheathing is attached?
B) 3 feet C) 4 feet D) 6 feet Answer: B — OSHA requires a minimum overlap of 3 feet for extension ladders to ensure safety and stability.
19. What is the primary purpose of blocking (bracing) between floor joists? A) To prevent the joists from twisting under load B) To provide a nailing surface for the subfloor C) To act as a thermal break D) To facilitate electrical conduit runs Answer: A — Bridging or blocking stabilizes the joists, preventing lateral movement and sharing loads between adjacent joists. 20. In finish carpentry, what is the term for a molding that covers the joint between an interior wall and the floor? A) Crown molding B) Casing
C) Baseboard D) Wainscoting Answer: C — Baseboard is the trim installed at the junction of the interior wall and the finished floor.
21. According to OSHA 29 CFR 1926.102, what type of eye protection must be worn when cutting metal studs with an abrasive saw? A) Safety glasses with side shields B) Goggles C) A face shield alone D) Prescription glasses Answer: A — Safety glasses with side shields are mandatory to protect against flying fragments. 22. What is the standard thickness of drywall used on most interior residential walls? A) 1/4 inch B) 3/8 inch C) 1/2 inch D) 5/8 inch Answer: C — Half-inch drywall is standard for walls due to its balance of strength, weight, and cost.
D) To align roof rafters Answer: A — The ledger board is bolted to the house framing and supports the deck joists.
26. A 2x4 wall is required to be fire-blocked. According to the IBC, horizontal fire blocking is typically required at what vertical interval? A) 4 feet B) 6 feet C) 8 feet D) 10 feet Answer: D — Fire blocking is required at 10-foot intervals vertically to prevent flame spread in concealed spaces. 27. Which type of paint is most durable for exterior wood trim? A) Flat latex B) Semi-gloss acrylic latex C) Eggshell D) Chalk paint
Answer: B — Semi-gloss or high-gloss acrylic latex paint offers the best durability and moisture resistance for exterior trim.
28. What is the standard size of a 2x4 piece of lumber after it has been dressed and dried? A) 2 inches by 4 inches B) 1 3/4 inches by 3 3/4 inches C) 1 1/2 inches by 3 1/2 inches D) 2 1/2 inches by 4 1/2 inches Answer: C — Nominal lumber dimensions differ from actual dimensions; a 2x4 actually measures 1.5" x 3.5". 29. According to the Gypsum Construction Handbook, what is the maximum screw spacing for 5/8" Type X drywall on a ceiling? A) 8 inches on center B) 12 inches on center C) 16 inches on center D) 24 inches on center Answer: B — Type X ceilings require screws every 12 inches on the edges and 16 inches in the field.
A) Aluminum nails B) Standard carbon steel nails C) Galvanized or stainless steel fasteners D) Copper nails Answer: C — Galvanized or stainless steel fasteners are required because the chemicals in pressure- treated wood are corrosive to regular steel.
33. What is the purpose of a beam in structural framing? A) To support vertical loads from above and distribute them horizontally to columns or posts B) To act as a decorative element only C) To provide lateral bracing for the foundation D) To hold drywall in place Answer: A — Beams are horizontal members that span between supports and carry vertical loads. 34. In blueprint reading, what does the symbol "CL" stand for? A) Center Line B) Column Line C) Ceiling Level
D) Cut Line Answer: A — CL designates Center Line, used for indicating the exact center of a structure for layout.
35. Which of the following materials is commonly used for subflooring? A) MDF (Medium Density Fiberboard) B) OSB (Oriented Strand Board) C) Particleboard D) Masonite Answer: B — OSB is widely used for subflooring because of its strength, stiffness, and cost-effectiveness. 36. Under the IBC, what is the maximum allowable headroom clearance for a stairway? A) 6 feet 2 inches B) 6 feet 6 inches C) 6 feet 8 inches D) 7 feet 0 inches Answer: C — The IBC requires a minimum headroom clearance of 6 feet 8 inches for stairs.
B) From the wall to the nosing C) From the nosing to the top of the riser D) From the center of the tread to the center of the next Answer: A — Tread depth is measured horizontally from the face of one riser to the face of the adjacent riser.
40. What does the acronym "P.T." represent for lumber material? A) Plywood Teak B) Pine Treated C) Pressure Treated D) Partially Trimmed Answer: C — P.T. lumber is impregnated with preservatives to resist rot, insects, and moisture. 41. When measuring for a cabinet installation, what is "scribe molding"? A) A molding used to form a tight seal against an uneven wall B) The decorative trim at the top of the cabinet C) The ornamental piece inside the cabinet door D) The base support for the cabinet
Answer: A — Scribe molding is a thin strip of wood attached to the cabinet stile and trimmed to fit flush against irregular walls.
42. Which of the following is the proper orientation for roof decking (OSB) panels relative to the trusses? A) Parallel to the rafters B) Perpendicular to the rafters C) Diagonal across the rafters D) Any orientation is acceptable Answer: B — Decking strength is greatest when installed perpendicular to the framing members to maximize load distribution. 43. In blueprint reading, a solid line with arrowheads pointing to a circle represents: A) A dimension line B) A section cut line C) An elevation symbol D) A door swing Answer: C — A circle with an arrow is a standard symbol indicating the direction of an elevation view (e.g., North elevation).
