100+ Free AZ ROC B-4 General Residential Engineering Practice Questions

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Key Facts: AZ ROC B-4 General Residential Engineering Exam

80 Questions

Official Question Count

PSI Candidate Information Bulletin

210 Minutes

Time Limit

PSI Candidate Information Bulletin

70%

Passing Score

Arizona Registrar of Contractors

$66

Exam Fee

PSI Services LLC

Open Book Computerized MCQ

Exam Format

PSI / AZ ROC Guidelines

100 Questions

Practice Question Bank

OpenExamPrep Practice Bank

The Arizona ROC B-4 General Residential Engineering Examination consists of 80 scored multiple-choice questions administered in a 210-minute open-book PSI computer-delivered session with a 70% passing threshold ($66 exam fee). This online practice bank provides 100 realistic English-language practice questions with comprehensive technical explanations adapted for exam preparation.

Sample AZ ROC B-4 General Residential Engineering Practice Questions

Try these sample questions to test your AZ ROC B-4 General Residential Engineering exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A contractor is designing a residential swimming pool with a total water capacity of 24,000 gallons. According to ISPSC standards requiring a maximum turnover time of 6 hours for residential pools, what is the minimum required circulation pump flow rate in gallons per minute (GPM)?

A.50.0 GPM

B.66.7 GPM

C.80.0 GPM

D.100.0 GPM

Explanation: To determine the required GPM for a 6-hour turnover: Flow Rate (GPM) = Total Pool Volume / (Turnover Hours * 60 minutes). GPM = 24,000 gallons / (6 * 60) = 24,000 / 360 = 66.67 GPM. Therefore, the circulation system pump must deliver at least 66.7 GPM.

2Under the Virginia Graeme Baker (VGB) Pool and Spa Safety Act and ISPSC 310, what is the minimum required center-to-center spacing between two submerged main drain suction outlets connected to a common suction line to prevent bather entrapment?

A.12 inches

B.24 inches

C.3 feet (36 inches)

D.5 feet (60 inches)

Explanation: ISPSC 310 and ANSI/APSP/ICC-7 mandate that dual suction outlets tee'd into a single suction line must be separated by a minimum of 3 feet (36 inches) measured center-to-center, or installed on two different planes (e.g., floor and wall), to prevent a bather's body from blocking both outlets simultaneously.

3According to ISPSC 305.2, what is the minimum required height for an outdoor residential swimming pool safety barrier (fence or wall) measured from the finished grade outside the enclosure?

A.48 inches

B.36 inches

C.60 inches

D.72 inches

Explanation: ISPSC 305.2 requires that the top of the pool safety barrier must be at least 48 inches (4 feet) above finished grade measured on the side of the barrier that faces away from the swimming pool.

4According to ACI 506.2 specifications for shotcrete pool structures, what is the minimum duration a newly pneumatically placed shotcrete pool shell must be kept continuously moist during the curing process before applying plaster?

A.24 hours

B.3 days

C.5 days

D.7 days

Explanation: ACI 506.2 specifies that pneumatically applied shotcrete pool shells must undergo wet curing (moist curing) for a minimum of 7 days to allow proper cement hydration, minimize shrinkage cracking, and develop adequate compressive strength before plastering.

5A pool contractor calculates that a swimming pool filtration system must move 60 GPM against a Total Dynamic Head (TDH) of 50 feet. Assuming a pump hydraulic efficiency of 65%, what is the required brake horsepower (BHP)? (Formula: BHP = (GPM * TDH in feet) / (3960 * Efficiency))

A.0.75 HP

B.1.17 HP

C.2.00 HP

D.3.50 HP

Explanation: Using the formula BHP = (GPM * TDH) / (3960 * Efficiency): BHP = (60 * 50) / (3960 * 0.65) = 3000 / 2574 = 1.1655 HP, which rounds to 1.17 HP. The contractor must select a pump motor capable of supplying at least 1.17 BHP.

6In accordance with ISPSC 305.3, pedestrian access gates installed in residential swimming pool barriers must open in which direction, and what latching characteristics are required?

A.Open inward toward the pool, latch at 36 inches above grade

B.Open inward toward the pool, latch at 48 inches above grade

C.Open outward away from the pool, self-closing and self-latching

D.Open in either direction, manual latching with padlocks

Explanation: ISPSC 305.3 requires pedestrian access gates to open outward away from the pool enclosure and be equipped with self-closing and self-latching devices to prevent small children from pushing the gate open into the pool area.

7A pool contractor tests pool water and obtains the following parameters: pH 7.6, Temperature Factor 0.7 (84°F), Calcium Hardness Factor 2.0 (200 ppm), Total Alkalinity Factor 2.1 (125 ppm), and TDS constant 12.1. Using LSI = pH + TF + CF + AF - TDS, what is the calculated LSI value?

A.+0.3 (balanced to slightly scale-forming)

B.-0.5 (corrosive water)

C.+1.2 (severely scale-forming)

D.-0.1 (extremely corrosive)

Explanation: LSI = 7.6 + 0.7 + 2.0 + 2.1 - 12.1 = 12.4 - 12.1 = +0.3. An LSI between -0.3 and +0.3 is considered ideal and balanced; +0.3 indicates balanced water with a slight scale-forming tendency, which protects pool plaster.

8What is the primary function of installing a hydrostatic relief valve in the floor sump of an in-ground concrete swimming pool?

A.Prevents pool water from backflowing into the municipal potable water supply

B.Equalizes filtration pressure across the sand filter media bed

C.Relieves thermal expansion pressure inside the gas pool heater

D.Relieves high groundwater pressure beneath the pool floor to prevent shell pop-out when drained

Explanation: A hydrostatic relief valve opens when external groundwater pressure beneath the pool exceeds internal water pressure, allowing ground water into the pool shell and preventing the hydrostatic pressure from lifting ('popping') the empty pool out of the ground.

9According to NEC 680.26, what is the minimum size solid copper conductor required to construct an equipotential bonding grid around an outdoor in-ground swimming pool?

A.10 AWG stranded copper

B.8 AWG solid copper

C.6 AWG aluminum

D.4 AWG solid copper

Explanation: NEC 680.26(B) requires an 8 AWG solid copper bonding conductor (insulated, covered, or bare) to connect all metallic pool structural components, pump motors, shell rebar, and perimeter surfaces into an equipotential bonding grid.

10According to ISPSC 410.1, water temperature in a residential spa or hot tub equipped with a water heating system shall not exceed what maximum limit?

A.104°F (40°C)

B.108°F (42°C)

C.110°F (43°C)

D.115°F (46°C)

Explanation: ISPSC 410.1 and CPSC guidelines set the maximum allowable spa water temperature at 104°F (40°C) to prevent hyperthermia, heat stroke, and cardiovascular distress in bathers.

About the AZ ROC B-4 General Residential Engineering Exam

The Arizona ROC B-4 General Residential Engineering Examination is a computer-delivered, open-book trade examination administered by PSI Services LLC for the Arizona Registrar of Contractors. The exam tests comprehensive residential engineering trade knowledge including swimming pool and spa construction, concrete slabs and footings, sitework and soil compaction, hardscaping and landscape irrigation, masonry retaining walls and fences, OSHA 1926 construction safety, residential roof coverings, doors and egress windows, building envelope insulation, and interior drywall installations.

Questions

80 scored questions

Time Limit

210 minutes

Passing Score

70%

Exam Fee

$66 (Arizona ROC / PSI Services LLC)

AZ ROC B-4 General Residential Engineering Exam Content Outline

13%

Pools, Spas and Hot Tubs

Swimming pool and spa layout, excavation, shotcrete/gunite shells, turnover rate calculations, hydraulic piping, filter sizing, pump selection, heater safety, main drain suction entrapment prevention (VGB Act/ISPSC), plastering, chemical water balance, and barrier fencing.

13%

General Concrete

Concrete mix design, water-cement ratio, slump testing, subgrade preparation, formwork, rebar placement and cover, slab-on-grade jointing (control/expansion joints), curing methods, compressive strength testing, and ACI 318/301 specifications.

10%

Sitework and Excavating

Topographic reading, site grading, soil compaction testing (Standard/Modified Proctor), swell and shrinkage calculations, cut-and-fill balancing, trench safety, erosion control (SWPPP), and stormwater drainage design.

Hardscaping and Sprinkler Systems

Paver installation, aggregate base depth, sand bedding, low-voltage landscape lighting, residential irrigation layout, backflow prevention (RPZ/PVB), friction loss calculations, precipitation rates, and drip irrigation zone valves.

10%

Walls and Fences

Segmental retaining wall design, CMU block wall construction, footing depth/reinforcement, soil lateral pressure, weep holes, geogrid soil reinforcement, structural fence installation, boundary clearances, and wind load resistance.

Safety

OSHA 29 CFR 1926 standards, trenching and excavation sloping/shielding, fall protection rules, hazard communication, personal protective equipment (PPE), overhead power line clearances, lockout/tagout, and silica dust exposure control.

12%

Roofing

Asphalt shingle installation, roof slope limitations, underlayment rules, valley flashing, drip edges, concrete/clay tile headlap and fastening, low-slope membrane roofing (BUR/TPO), roof ventilation calculations, and leak repair methods.

Doors and Windows

Rough opening framing, header sizing, flashing details, sill pan protection, window Egress clearance rules, safety glazing (tempered glass locations), door weatherstripping, and NFRC energy performance ratings (U-factor, SHGC).

Insulation

R-value requirements by Arizona climate zone (IECC/IRC), fiberglass batt installation, blown-in cellulose density, spray polyurethane foam (SPF) safety/ignition barriers, vapor retarder placement, attic ventilation ratios, and air sealing.

Drywall

Gypsum board thickness selection, Type X fire-rated assemblies, fastener spacing schedules, joint compound taping and finishing (Levels 0–5), water-resistant greenboard/cement board applications, and texture application techniques.

How to Pass the AZ ROC B-4 General Residential Engineering Exam

What You Need to Know

Passing score: 70%
Exam length: 80 questions
Time limit: 210 minutes
Exam fee: $66

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

AZ ROC B-4 General Residential Engineering Study Tips from Top Performers

1Master hydraulic calculations for swimming pool turnover rates (GPM = Volume / Turnover hours / 60) and TDH pipe friction losses.

2Review ACI concrete standards for rebar clearance (3 inches against unformed earth, 1.5–2 inches formed exposed to earth), slump tests, and maximum water-cement ratio.

3Understand soil compaction testing (Proctor density percentages), cut-and-fill volumetric conversions (bank vs. loose vs. compacted cubic yards), and slope stability.

4Memorize ISPSC anti-entrapment rules (Virginia Graeme Baker Act dual main drain spacing minimum of 3 feet on center or unblockable drain) and pool safety barrier height/gate requirements (minimum 48 inches high, self-closing/self-latching).

5Study OSHA 29 CFR 1926 excavation rules (sloping/benching for Type A, B, C soils; ladders required within 25 feet of travel in trenches 4 ft or deeper).

Frequently Asked Questions

How many questions are on the official Arizona ROC B-4 General Residential Engineering exam?

The official PSI B-4 General Residential Engineering exam contains 80 scored multiple-choice questions. Candidates are allotted 210 minutes to complete the exam.

What passing score is required for the AZ ROC B-4 exam?

A minimum passing score of 70% (56 correct answers out of 80 questions) is required to pass the trade exam.

Is the Arizona ROC B-4 examination open book?

Yes, the examination is open-book. Approved reference books (such as IRC, ISPSC, ACI 318/301, OSHA 29 CFR 1926, and trade reference manuals) marked according to PSI rules may be brought into the testing center.

What areas are covered under the B-4 classification scope?

The B-4 classification covers residential swimming pools, spas, concrete slabs, grading/excavation, hardscaping, irrigation, retaining walls, fences, residential roofing, doors, windows, insulation, and drywall.

Where can I schedule the AZ ROC B-4 trade examination?

Examinations are scheduled online through PSI Services LLC at https://test-takers.psiexams.com/azcon or by phone with PSI candidate services.

100+ Free AZ ROC B-4 General Residential Engineering Practice Questions

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