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115+ Free AZ ROC A (KA) Dual Engineering Practice Questions

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Key Facts: AZ ROC A (KA) Dual Engineering Exam

AZ ROC / PSI

Exam Body

Arizona Registrar of Contractors

100 Scored MCQs

Exam Format

PSI Candidate Information Bulletin

240 Minutes

Time Allowed

PSI Candidate Information Bulletin

70%

Passing Threshold

Arizona ROC Licensing Rules

Computer / Open-Book

Delivery Mode

PSI Testing Centers

$66

Exam Fee

PSI Examination Schedule

Prepare for the Arizona ROC A (KA) Dual Engineering trade exam with 100 realistic practice questions covering site work, civil utilities, concrete, structural systems, and OSHA safety. The official exam consists of 100 open-book questions administered by PSI in a 240-minute session with a 70% passing threshold. Note: local practice MCQs are an English-language MCQ study adaptation.

Sample AZ ROC A (KA) Dual Engineering Practice Questions

Try these sample questions to test your AZ ROC A (KA) Dual Engineering exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 115+ question experience with AI tutoring.

1Under NEC Article 680, what is the minimum size of solid copper conductor required to form the equipotential bonding grid around an outdoor permanently installed swimming pool?
A.#8 AWG solid copper
B.#6 AWG stranded copper
C.#10 AWG solid copper
D.#4 AWG aluminum
Explanation: NEC Section 680.26(B) explicitly requires an equipotential bonding grid around pools constructed with a minimum #8 AWG solid copper conductor. Stranded conductors and aluminum conductors are strictly prohibited in direct contact with earth or pool concrete due to corrosion risks.
2According to the Virginia Graeme Baker (VGB) Pool and Spa Safety Act and ISPSC standards, what is the required configuration for submerged suction outlets in a commercial swimming pool?
A.A single main drain cover with an automatic shut-off pump relay
B.At least two anti-entrapment suction outlets separated by a minimum of 3 feet on center
C.Dual main drains spaced a maximum of 12 inches apart connected to a common header
D.A single unvented gravity suction sump with a flat grate cover
Explanation: The VGB Act and ISPSC require all pools to feature at least two hydraulically balanced suction outlets (main drains) separated by a minimum distance of 3 feet on center, or located on two different planes, each fitted with VGB-compliant anti-entrapment covers to eliminate suction entrapment hazards.
3What are the maximum allowable water turnover times for a public commercial swimming pool and a public spa, respectively, per ISPSC standards?
A.12 hours for a pool and 2 hours for a spa
B.8 hours for a pool and 1 hour for a spa
C.6 hours for a pool and 30 minutes for a spa
D.4 hours for a pool and 15 minutes for a spa
Explanation: ISPSC Section 311 mandates that public swimming pools maintain a water turnover rate of not more than 6 hours per complete filtration cycle. Public spas experience much higher bather loads per gallon and require a maximum turnover rate of 30 minutes.
4What is the NEC Article 680 restriction regarding convenience electrical receptacles installed near an outdoor swimming pool wall?
A.Receptacles may be installed 3 feet from the pool wall if hardwired with #12 AWG copper
B.Receptacles are permitted anywhere along the coping provided they have weatherproof covers
C.At least one GFCI-protected receptacle must be located between 6 feet and 20 feet from the pool, with no receptacle permitted within 6 feet
D.No receptacles are permitted within 20 feet of the inside pool wall under any condition
Explanation: NEC 680.22(A) requires that no fewer than one 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit be located not less than 6 ft from, and not more than 20 ft from, the inside wall of a permanently installed pool. Other receptacles must also be kept at least 6 ft from the inside wall, and all 15- and 20-ampere, 125-volt receptacles within 20 ft require GFCI protection.
5What is the primary engineering purpose of installing a hydrostatic relief valve in the floor sump of an in-ground concrete swimming pool?
A.To equalize external hydrostatic groundwater pressure under the shell and prevent pool flotation during dewatering
B.To relieve internal hydraulic pressure generated by high-head filtration pumps
C.To purge trapped air pockets from the main suction line during pump priming
D.To automatically drain overflow water when rainwater exceeds the pool skimmer level
Explanation: When an in-ground pool is drained for maintenance in high water table areas, external groundwater pressure can pop or float the pool shell out of the ground. Hydrostatic relief valves open automatically under external groundwater pressure to allow water into the pool interior, equalizing pressure and preserving structural stability.
6What ventilation feature is required for dedicated chemical storage rooms housing elemental chlorine gas cylinders for commercial pool treatment?
A.Natural gravity roof louvers only
B.Continuous mechanical exhaust ventilation with intake near the ceiling and exhaust taking suction near floor level
C.High-velocity ceiling exhaust fans pulling air upward toward the roof deck
D.Positive-pressure supply fans blowing outside air into the room without exhaust ducting
Explanation: Chlorine gas is heavier than air (density approx. 2.5 times air). Therefore, ventilation systems in chlorine gas equipment rooms must pull exhaust air from near floor level where leaking gas settles, discharging safely outdoors.
7What is the minimum 28-day compressive strength required for pneumatically applied concrete (shotcrete/gunite) forming a structural pool shell?
A.2,500 psi
B.3,000 psi
C.4,000 psi
D.5,500 psi
Explanation: ACI 506.2 and standard pool structural specifications mandate a minimum 28-day compressive strength of 4,000 psi for shotcrete pool shells to ensure watertight integrity, durability against chemical erosion, and structural resistance to soil forces.
8A rectangular commercial swimming pool measures 50 feet long by 24 feet wide. The shallow end is 3 feet deep for a length of 20 feet, sloping uniformly over 20 feet to a deep end depth of 9 feet for the remaining 10 feet. What is the approximate pool volume in gallons, and what flow rate (GPM) is required for a 6-hour turnover?
A.31,200 gallons and 87 GPM
B.36,000 gallons and 100 GPM
C.48,500 gallons and 135 GPM
D.58,000 gallons and 161 GPM
Explanation: Total profile area = (3' × 20') + [(3' + 9')/2 × 20'] + (9' × 10') = 60 + 120 + 90 = 270 sq ft. Average depth = 270 / 50 = 5.4 ft. Total volume = 50' × 24' × 5.4' = 6,480 cu ft. In gallons: 6,480 × 7.48 = 48,470 gallons (approx 48,500 gal). Required 6-hour turnover flow rate = 48,470 / 360 min = 134.6 GPM (approx 135 GPM).
9When connecting a commercial landscape irrigation system containing chemical fertigation injectors to a potable water supply, which backflow assembly is mandatory?
A.Reduced Pressure Zone (RPZ) backflow preventer assembly
B.Double Check Valve Assembly (DCVA)
C.Atmospheric Vacuum Breaker (AVB) installed at grade level
D.Single check valve with a bypass meter
Explanation: Irrigation systems with chemical injection (fertigation) present a high health hazard (toxic contaminant backflow). AWWA and local plumbing codes mandate a Reduced Pressure Zone (RPZ) assembly, as DCVAs and AVBs are not rated for high-hazard chemical applications.
10In commercial turf irrigation design, what does the principle of 'head-to-head coverage' require?
A.Sprinkler heads should be spaced so each head throws water 25% of the distance to adjacent heads
B.Sprinkler heads must be placed such that the spray radius of each head reaches the location of adjacent sprinkler heads (100% radius overlap)
C.Sprinklers are spaced at twice the manufacturer's rated throw radius
D.Sprinklers should alternate between full-circle and half-circle heads on the same lateral line
Explanation: Head-to-head coverage means the distance between sprinkler heads equals the throw radius of the heads (50% pattern overlap / 100% radius reach). This ensures uniform precipitation rates and eliminates dry spots caused by wind drift or nozzle edge drop-off.

About the AZ ROC A (KA) Dual Engineering Exam

The Arizona ROC A (KA) Dual Engineering trade examination scope covers both commercial and residential general engineering construction. It tests technical knowledge across 14 subject areas including concrete and paving; sitework, excavation, compaction and grading; sewers; water and gas piping; roofing; insulation; drywall; pools and spas; hardscaping; walls and fences; electrical transmission lines; photovoltaic systems; and safety.

Assessment

100 scored multiple-choice open-book questions administered by PSI Services LLC over 240 minutes, covering 14 civil engineering and trade subject areas.

Time Limit

240 minutes

Passing Score

70%

Exam Fee

$66 (Arizona ROC / PSI Services LLC)

AZ ROC A (KA) Dual Engineering Exam Content Outline

13%

Concrete and Paving

Subgrade compaction, aggregate base, asphalt binder selection (PG grades), concrete mix design (w/cm ratio), ACI placement, reinforcement cover, curing, and expansion/control joints.

13%

Sitework, Excavation, Compaction, and Grading

Cut and fill earthwork takeoff, swell and shrinkage factors, soil classification and Proctor density testing, moisture conditioning, lift thickness, roller selection, trench safety sloping and benching, and finish grade staking.

9%

Sewers

Sanitary sewer pipe sizing, self-cleansing slope, manhole spacing and drop connections, air leakage testing (ASTM F1417), pipe bedding classes, Manning's flow equation, and CIPP.

8%

Safety

OSHA 1926 excavation and trench sloping (Subpart P), fall protection (Subpart M), trench shields, LOTO, SDS 16-section format, PPE, rigging inspection, and confined space safety.

7%

Pools, Spas, and Hot Tubs

NEC Article 680 equipotential bonding, Virginia Graeme Baker anti-entrapment covers, ISPSC pool turnover rates, hydrostatic relief valves, GFCI protection, and pool shell concrete.

7%

Hardscaping and Sprinkler Systems

Backflow prevention assemblies (RPZ/PVB), head-to-head coverage, paver base course and sand bed, segmental retaining walls, geogrid, mainline velocity limits, and drainage.

6%

Water Piping

AWWA C600/C900 standards, hydrostatic pressure testing (150 psi / 2 hrs), water main chlorination and bacteriological testing, thrust block sizing, and separation from sewer lines.

6%

Gas Piping

IFGC / NFPA 54 standards, tracer wire installation on nonmetallic pipe, pressure testing, natural gas pipe sizing tables, burial depth, purging procedures, and PE heat fusion.

6%

Roofing

IBC Chapter 15 requirements, low-slope roof drainage (1/4 in/ft), single-ply TPO/EPDM membranes, BUR assemblies, asphalt shingle underlayment, step flashing, and cant strips.

6%

Insulation

IBC 2603 foam plastic 15-minute thermal barriers, vapor retarder placement for desert climates, spray foam density, R-value assembly math, attic net free ventilation, and pipe insulation.

6%

Drywall

GA-216 and ASTM C840 standards, 5/8" Type X 1-hour fire ratings, fastener spacing for ceilings and walls, green board restrictions, Level 5 finishing, control joints, and STC ratings.

5%

Walls and Fences

ASTM C270 CMU mortar types (M, S, N), low-lift vs high-lift grouting cleanouts, wind load structural calculations, bed-joint wire reinforcement, chain-link post footings, and weep holes.

5%

Electrical Transmission Lines

NESC overhead conductor clearance, utility pole depth formula (10% + 2 ft), guy wire anchor holding capacity, transmission line grounding counterpoise, conductor sag, and insulators.

3%

Photovoltaic Systems

NEC Article 690 rapid shutdown requirements, DC overcurrent protection sizing (156% Isc factor), system grounding electrode integration, array tilt/azimuth, and roof structural loading.

How to Pass the AZ ROC A (KA) Dual Engineering Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 100 scored multiple-choice open-book questions administered by PSI Services LLC over 240 minutes, covering 14 civil engineering and trade subject areas.
  • Time limit: 240 minutes
  • Exam fee: $66

Keys to Passing

  • Work through all 115 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

AZ ROC A (KA) Dual Engineering Study Tips from Top Performers

1Tab and highlight your approved reference books (OSHA 1926, IBC, UPC, NEC, ADOT Specs) so you can look up code sections rapidly during the open-book exam.
2Master civil math calculations including concrete volume yardage, trench excavation slope run/rise, pipe flow rates, and electrical wire sizing.
3Focus heavily on the largest blueprint sections: Concrete and Paving (13 items); Sitework, Excavation, Compaction and Grading (13 items); Sewers (9 items); and Safety (8 items).
4Practice navigating code tables under timed conditions to simulate the 240-minute exam pressure.
5Review OSHA Subpart P (Excavations) and Subpart M (Fall Protection) thoroughly, as safety questions are strict and direct.

Frequently Asked Questions

What is the scope of the Arizona ROC KA Dual Engineering license?

The KA Dual Engineering classification allows a contractor to perform general engineering contracting work on both commercial (Class A) and residential projects, including site preparation, utilities, paving, concrete, structural masonry walls, electrical transmission, solar arrays, and water/sewer systems.

Is the official Arizona ROC KA Dual Engineering exam open-book?

Yes. The official exam administered by PSI is open-book. Candidates are permitted to bring approved, bound reference materials into the testing center.

What passing score is required for the KA Dual Engineering exam?

Candidates must achieve a minimum score of 70% (70 correct answers out of 100 scored items) within the 240-minute time limit.

How are the practice questions in this question bank structured?

This question bank distributes its practice multiple-choice questions across all 14 official PSI blueprint subject areas in proportion to their published item counts, with technical explanations, code references (OSHA, IBC, NEC, AWWA, IFGC), and per-distractor rationales.

How do I schedule my exam with PSI?

Once your license application background check and qualifying experience are reviewed and approved by the Arizona Registrar of Contractors, you will receive eligibility notification to register and schedule your test at a PSI testing center.