10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The NV-B exam has 80 questions and runs 3 hours.
These 10 free NV-B questions are organized by exam domain, so you can see how each part of the Nevada General Building Contractor (Class B) Trade Exam blueprint is tested. Reveal the answer and explanation under each question.
A structural-fill lift must achieve 95% of a laboratory maximum dry density of 124 pcf. A field test reports a wet density of 122.4 pcf at 8.0% moisture content. Using dry density = wet density / (1 + moisture decimal), what should the superintendent conclude?
Correct answer: A - The lift is about 91.4% compacted; it fails and must be reworked, recompacted, and retested
Under ACI 318-14, concrete with f'c = 4,000 psi is acceptable when every three-test rolling average is at least 4,000 psi and no individual test is below 3,500 psi. Three consecutive standard-cured strength tests are 3,700, 4,100, and 4,300 psi; their reported average is 4,033 psi. How should these results be judged?
Correct answer: C - They satisfy both strength-acceptance criteria, so routine testing may continue
An approved concrete mix uses a high-range water reducer to produce an 8-inch placement slump without changing the water-cement ratio. The batch ticket, admixture dose, temperature, and delivery time are within the approved limits. A foreman argues that the slump proves water was added and rejects the load. Which conclusion is technically defensible?
Correct answer: B - Check the result against the approved mix limits; high slump alone does not prove excess water
During placement of a congested grade beam, a worker lays an internal vibrator nearly horizontal and drags it about 8 feet to move fresh concrete around the reinforcing bars. What instruction best corrects the practice?
Correct answer: B - Deposit concrete near its final position and consolidate it with regular vertical insertions
A long exterior wall consists of reinforced CMU backup and clay-brick veneer. At the designated movement-joint locations, the crew fills both joints with mortar and installs veneer ties across them. Which correction matches the behavior of the two masonry materials?
Correct answer: D - Provide a CMU control joint and a brick expansion joint without rigid materials bridging either joint
During preinstallation inspection of a slip-critical beam splice, the faying surfaces are found coated with a shop primer that is not qualified for the specified slip coefficient. The bolts have not been tightened. What is the proper resolution?
Correct answer: C - Obtain an approved disposition and restore or verify the required faying-surface class before pretensioning
A structural weld symbol shows a fillet-weld triangle above the reference line, a circle at the arrow/reference-line junction, and a flag at that junction. What work does the symbol require?
Correct answer: D - An other-side fillet weld made all around the joint in the field
A high-strength bolt is 6D long. One outer face is normal to the bolt axis, and the other is sloped 1:30. Under the turn-of-nut pretensioning procedure, what additional relative rotation is required after the joint reaches snug-tight?
Correct answer: D - Two-thirds of a turn
A renovation removes the ceiling joists to create a vaulted ceiling beneath a conventionally framed, equal-slope gable roof. Opposing rafters meet at a nonstructural ridge board, and no lower-third rafter ties remain. Which redesign addresses the resulting outward thrust?
Correct answer: A - Provide a structural ridge beam or another engineered system with a complete load path
A commercial stair connects floors with a total rise of 104 inches. Under the 2018 IBC, risers may not exceed 7 inches, and the upper floor serves as the final walking surface. Which layout uses the minimum number of compliant equal risers?
Correct answer: C - 15 risers and 14 treads
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