Arizona ROC B-4 General Residential Engineering Examination

A 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)?

• A50.0 GPM
• B66.7 GPM
• C80.0 GPM
• D100.0 GPM

Under 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?

• A12 inches
• B24 inches
• C3 feet (36 inches)
• D5 feet (60 inches)

According 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?

• A48 inches
• B36 inches
• C60 inches
• D72 inches

According 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?

• A24 hours
• B3 days
• C5 days
• D7 days

A 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))

• A0.75 HP
• B1.17 HP
• C2.00 HP
• D3.50 HP

In 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?

• AOpen inward toward the pool, latch at 36 inches above grade
• BOpen inward toward the pool, latch at 48 inches above grade
• COpen outward away from the pool, self-closing and self-latching
• DOpen in either direction, manual latching with padlocks

A 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)

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

• APrevents pool water from backflowing into the municipal potable water supply
• BEqualizes filtration pressure across the sand filter media bed
• CRelieves thermal expansion pressure inside the gas pool heater
• DRelieves high groundwater pressure beneath the pool floor to prevent shell pop-out when d…

According 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?

• A10 AWG stranded copper
• B8 AWG solid copper
• C6 AWG aluminum
• D4 AWG solid copper

According 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?

• A104°F (40°C)
• B108°F (42°C)
• C110°F (43°C)
• D115°F (46°C)

A swimming pool system has a design flow rate of 80 GPM. If the maximum allowable filtration rate for a Diatomaceous Earth (DE) filter is 2.0 GPM per square foot of filter area, what is the minimum required filter surface area?

• A20 sq ft
• B30 sq ft
• C40 sq ft
• D60 sq ft

What is the primary operational function of the floating weir gate located in the throat of a residential pool surface skimmer?

• ARegulates the percentage of water drawn from the main drain relative to the skimmer
• BPrevents captured surface floating debris from washing back into the pool when the circul…
• CControls the chemical dispensing rate from an inline erosion feeder
• DRelieves excess hydraulic pressure inside the skimmer basket housing

When completing a classic Portland cement-based marcite plaster interior finish on a concrete pool shell, when should the pool be filled with water?

• AWait 7 days for the plaster to dry thoroughly before adding water
• BWait 14 days to allow full plaster hydration
• CWait 28 days until maximum compressive strength is reached
• DBegin filling immediately upon plaster setting to prevent rapid drying, shrinkage, and cr…

According to ACI 318-19 Table 20.5.1.3.1, what is the minimum required concrete cover over steel reinforcement for cast-in-place concrete placed directly against and permanently exposed to unformed earth?

• A3 inches
• B2 inches
• C1.5 inches
• D1 inch

A concrete mix batch contains 564 lbs of Portland cement, 1,850 lbs of coarse aggregate, 1,420 lbs of fine aggregate, and 31 gallons of mixing water. What is the water-cementitious ratio (w/cm) of this mix? (1 gallon of water weighs 8.33 lbs).

• A0.35
• B0.40
• C0.46
• D0.55

When performing a standard concrete slump test according to ASTM C143 using a standard 12-inch high slump cone, in how many layers is the cone filled, and how many times is each layer rodded?

• A2 layers, rodded 15 times per layer
• B3 layers of equal volume, rodded 25 times per layer
• C4 layers of equal height, rodded 20 times per layer
• D3 layers of equal volume, rodded 50 times per layer

According to ACI 302.1R recommendations for unreinforced residential concrete slabs-on-grade, what is the maximum suggested spacing in feet for contraction (control) joints in a 4-inch thick slab?

• A4 feet
• B6 feet
• C15 feet
• D10 feet

A contractor is placing a concrete driveway measuring 20 feet wide by 45 feet long with a specified uniform thickness of 5 inches. Allowing a 5% waste factor, how many cubic yards of concrete should be ordered?

• A12.5 cubic yards
• B14.6 cubic yards
• C16.8 cubic yards
• D18.2 cubic yards

Standard laboratory concrete cylinder compression tests (ASTM C39) evaluate the specified design compressive strength (f'c) of concrete at what standard age?

• A28 days
• B7 days
• C14 days
• D60 days

When saw-cutting contraction (control) joints into a fresh concrete slab-on-grade, what is the minimum required depth of the cut relative to the slab thickness (t)?

• A1/10 of slab thickness
• B1/8 of slab thickness
• C1/4 of slab thickness
• D1/2 of slab thickness

What is the standard minimum lap splice length required for #4 reinforcing bars (0.50-inch diameter) in 3,000 psi concrete for a Class B lap splice under ACI 318?

• A6 inches
• B9 inches
• C12 inches
• D18 inches

What is the primary operational hazard when placing structural concrete during hot Arizona summer conditions (above 90°F / 32°C) without using retarders or temperature control measures?

• ARapid slump loss, severe plastic shrinkage cracking, and lower long-term ultimate compres…
• BDelayed setting times leading to excessive surface bleed water accumulation
• CExcessive 28-day compressive strength gain exceeding design limits
• DImmediate alkali-silica reaction expanding aggregate particles

Under normal ambient temperatures (above 50°F / 10°C), how soon after placing concrete can vertical side forms for unreinforced residential footings or slab edges be removed safely?

• A4 hours
• B12 to 24 hours
• C7 days
• D28 days

What target entrained air content percentage is specified by ACI 318 for exterior concrete exposed to severe freeze-thaw conditions using 3/4-inch nominal maximum aggregate size?

• A1.0% to 2.0%
• B3.0% to 4.0%
• C5.5% to 7.0% (target 6.0%)
• D9.0% to 11.0%

According to ACI 308R, how many days of continuous moist curing are required for standard Type I Portland cement concrete to achieve approximately 70% of its specified design strength?

• A1 day
• B3 days
• C5 days
• D7 days

What mechanical property does the grade designation 'Grade 60' specify for deformed steel reinforcing bars according to ASTM A615?

• AMinimum yield strength of 60,000 psi
• BMinimum ultimate tensile strength of 60,000 psi
• CNominal bar diameter of 6/0 inch
• DMaximum bending angle of 60 degrees

An excavation contractor cuts 1,200 bank cubic yards (BCY) of dense clay soil with an established swell factor of 25%. What volume in loose cubic yards (LCY) will this excavated material occupy in haul trucks?

• A960 LCY
• B1,500 LCY
• C1,800 LCY
• D2,100 LCY

In earthwork site specifications requiring '95% Standard Proctor Maximum Dry Density (MDD)', what does this technical requirement mean?

• A95% of the total soil volume must consist of solid soil minerals
• BSoil moisture content must be maintained at 95% of saturation
• CThe field dry density of the compacted fill must equal at least 95% of the maximum dry de…
• DCompaction rollers must operate at 95% of maximum rated weight

When installing a geotextile silt fence along a construction boundary for stormwater sediment control, what is the minimum required depth that the bottom flap of the fabric must be trenched into the ground?

• ASurface staked with zero trenching
• B2 inches
• C4 inches
• D6 inches

According to IRC R401.3, what is the minimum required slope for unpaved ground surface extending away from a residential building foundation wall?

• AMinimum 6 inches fall within the first 10 feet (5% slope)
• BMinimum 2 inches fall within the first 10 feet
• CMinimum 12 inches fall within the first 10 feet
• DMinimum 1 inch per foot for 20 feet

An earthwork project requires excavating 500 BCY of native soil. The soil experiences a 10% shrinkage factor when placed and compacted into final fill relative to its natural bank state (Compacted Volume = 0.90 * BCY). How many compacted cubic yards (CCY) of fill will this 500 BCY produce?

• A400 CCY
• B450 CCY
• C500 CCY
• D600 CCY

Under Arizona Revised Statutes (A.R.S. § 40-360.21), how many working days advance notice must an excavation contractor give to Arizona 811 (Blue Stake) before commencing digging?

• ASame day notice (0 working days)
• B1 working day
• C2 working days
• D5 working days

When installing non-metallic drainage pipe in an excavation, what material type and depth must be placed directly beneath the pipe to establish proper pipe bedding?

• ANative expansive clay compacted with heavy rollers
• BUncompacted topsoil
• CConcrete slurry poured completely over top of pipe
• D4 to 6 inches of clean coarse sand or crushed aggregate (1/4 to 3/4 inch)

In a subsurface French drain system designed to collect foundation perimeter groundwater, how should the perforated pipe and filter fabric envelope be installed?

• APerforations facing DOWN embedded in washed aggregate wrapped in geotextile filter fabric
• BPerforations facing UP without filter fabric
• CSolid pipe wrapped with plastic sheeting
• DPerforations facing UP filled with fine sand

Clean dry sand typically exhibits a natural angle of repose of approximately how many degrees from horizontal?

• A15 degrees
• B34 degrees
• C60 degrees
• D75 degrees

According to OSHA 29 CFR 1926 Subpart P Appendix A, which soil type is defined as cohesive soil with an unconfined compressive strength of 1.5 tons per square foot (tsf) or greater?

• AType C soil
• BType B soil
• CType A soil
• DSolid Rock

According to Interlocking Concrete Pavement Institute (ICPI) installation guidelines, what is the standard loose thickness for the uncompacted bedding sand layer placed over the aggregate base before laying pavers?

• A1 inch
• B3 inches
• C0.25 inches
• D5 inches

An irrigation lateral line supplies 12 GPM through 150 feet of 1-inch Schedule 40 PVC pipe. If friction loss per 100 feet of pipe is 2.4 PSI, what is the total pressure drop across the 150-foot run?

• A1.6 PSI
• B2.4 PSI
• C3.0 PSI
• D3.6 PSI

According to IPC / IRC P2902.5.3, what backflow prevention assembly is required when a chemical fertilizer injector (fertigation system) is connected to a residential irrigation system?

• AAtmospheric Vacuum Breaker (AVB)
• BReduced Pressure Principle Backflow Assembly (RPZ)
• CStandard inline single check valve
• DDual check valve without atmospheric vent

A Pressure Vacuum Breaker (PVB) installed on a residential irrigation system must be located at least how many inches above the highest downstream sprinkler head or discharge point?

• ALevel with highest head (0 inches)
• B6 inches
• C12 inches
• D36 inches

A residential lawn sprinkler zone has 4 full-circle spray heads emitting 2.0 GPM each, spaced in a 20 ft by 20 ft square pattern. What is the matched precipitation rate in inches per hour? (Formula: PR = (96.25 * Total GPM) / Area in sq ft)

• A1.93 in/hr
• B0.96 in/hr
• C2.50 in/hr
• D3.85 in/hr

A contractor installs twenty 12V LED landscape path lights rated at 4 Watts each on a single low-voltage lighting transformer. Applying an 80% maximum continuous load safety factor, what is the minimum required transformer rating in Volt-Amperes (VA / Watts)?

• A50 VA
• B75 VA
• C80 VA
• D100 VA

Residential drip irrigation emitters operate within what recommended pressure range, requiring an inline pressure regulator on the drip zone valve?

• A5 to 10 PSI
• B15 to 30 PSI
• C50 to 70 PSI
• D80 to 100 PSI

What aggregate specification must joint sand meet when swept between interlocking concrete pavers to ensure proper load transfer according to ICPI standards?

• AFine rounded beach sand
• BUnscreened clay soil
• CAngular, well-graded silica sand meeting ASTM C144
• DCoarse 1/2-inch pea gravel

Arizona municipal water conservation codes require automatic residential irrigation controllers to be equipped with what control device?

• AAutomatic rain shutoff sensor or weather-based smart controller
• BManual bypass toggle switch only
• CInline water pressure relief valve
• DAudible high-flow alarm

In segmental retaining wall (SRW) construction, structural geogrid soil reinforcement layers are generally required when unreinforced wall height exceeds what threshold?

• A2 feet
• B4 feet
• C6 feet
• D8 feet