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The AZ-B2 exam has 100 questions and runs 4 hours.
These 10 free AZ-B2 questions are organized by exam domain, so you can see how each part of the Arizona B-2 General Small Commercial Contractor Trade Exam blueprint is tested. Reveal the answer and explanation under each question.
An engineered-fill specification requires at least 95% of the ASTM D1557 maximum dry density. The laboratory maximum is 125.0 lb/ft³. A field test reports wet density of 126.5 lb/ft³ and moisture content of 10.0% by dry soil mass. The moisture content is within the permitted range. Select the relative compaction and the disposition of this tested lift.
Correct answer: A - 92.0% relative compaction; rework and retest the lift before covering it.
On a hot, windy afternoon, shallow cracks appear across an exposed slab while the concrete is still plastic. The cracks are not concentrated over reinforcing bars, and the protected portion of the same placement remains uncracked. Which mechanism best fits these observations?
Correct answer: C - Plastic shrinkage as surface evaporation outpaces replacement by bleed water
The first three consecutive 28-day strength tests for a 4,000-psi concrete mixture are 3,700, 4,250, and 4,350 psi. Each result is the average of two properly made and standard-cured 6-by-12-inch cylinders. No stricter acceptance criteria are specified. How should these results be classified under ACI 318-14?
Correct answer: A - Acceptable: the 4,100-psi average and the 3,700-psi lowest test satisfy both strength criteria.
Conventional masonry grout for reinforced CMU measures 9.5 inches of slump. The approved specification uses the ASTM C476 conventional-grout slump range without a tighter project limit; the mixture and other delivery checks comply. A foreman objects that the grout is much more fluid than floor-slab concrete. Which assessment is correct?
Correct answer: D - Accept the slump, while retaining the specified consolidation and reconsolidation procedure.
A slip-critical steel splice has the specified bolts and verified bolt pretension. However, both faying surfaces are completely covered with a primer that is not qualified for slip-critical joints; the approved detail requires uncoated surfaces. Which proposal addresses the connection's remaining deficiency?
Correct answer: D - Restore the specified faying surfaces and reestablish pretension using the approved procedure.
The erection crew has field-bolted both seats of an 80-foot, top-chord-bearing steel joist to stabilized supports. This is an individual joist away from column lines, not a column or tie joist. What is OSHA's minimum erection-bridging requirement before the hoisting cable can be released?
Correct answer: C - Two anchored rows of bolted diagonal erection bridging nearest the joist's third points
A proposed vaulted-ceiling conversion would remove ceiling joists that currently tie opposing rafters together at the wall plates. The conventional gable roof has a ridge board, not a structural ridge beam. Upper-third collar ties and the roof sheathing would remain. Which existing load-resisting function would be lost?
Correct answer: D - Resisting the rafters' outward thrust at the opposing exterior bearing walls
An exterior sealant joint tears through the sealant after repeated thermal movement. The sealant remains bonded to both joint faces and to the rigid material at the back of the joint. Joint width and the selected sealant's movement rating match the approved design, but the specified backer rod was omitted. What caused the loss of movement capability?
Correct answer: C - Three-sided adhesion restraining the sealant's movement
An exit door serves 76 occupants in a Group B office. It provides 34 inches of clear width and has a lever latch that allows free egress, but it swings into the office. The door is not fire-rated, and no special hardware provisions apply. Under the 2018 IBC, what minimum change is required?
Correct answer: B - Reverse the door swing; the compliant lever latch may remain in service.
Two workers are connecting pipe in a 4-foot-6-inch-deep trench that was previously judged stable without shoring. After rain, the competent person sees fresh cracks behind the trench edge and soil sloughing from a sidewall. What instruction takes priority?
Correct answer: B - Have the exposed workers leave the trench until adequate protective measures are in place.
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