100+ Free Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Practice Questions
Prepare for the Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Examination exam with instant access — no signup required.
Loading practice questions...
Explore More Arizona Registrar of Contractors Trade Examinations
Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.
Key Facts: Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Exam
80
Official Exam Questions
PSI Candidate Information Bulletin
210 min
Exam Time Limit
PSI Services
70%
Passing Score (56/80)
AZ Registrar of Contractors
$66
Trade Exam Fee
PSI Test Delivery
2 ft
OSHA Spoil Pile Setback
OSHA 1926.651(j)(2)
25 ft
Max Egress Travel Distance
OSHA 1926.651(c)(2)
The Arizona ROC A-12 / CR-80 trade exam contains 80 scored multiple-choice questions administered by PSI Services over 210 minutes with a 70% passing threshold. Local practice MCQs serve as an English-language study adaptation of trade standards, OSHA trench safety rules, and pipe hydraulics.
Sample Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Practice Questions
Try these sample questions to test your Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying 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 laying a 400-foot run of 8-inch gravity sewer pipe between two manholes. If the invert elevation at the upstream manhole is 100.00 feet and the downstream invert is 98.00 feet, what is the slope percentage of the sewer line?
2Per standard gravity sanitary sewer design guidelines (such as Ten States Standards and UPC), what minimum flow velocity must be maintained when flowing full to prevent solid waste settlement?
3The invert elevation at Upstream Manhole A is 105.50 feet. A 10-inch PVC sewer main extends 250 feet to Downstream Manhole B at a slope of 1.00%. What is the invert elevation at Manhole B?
4When performing a low-pressure air test on a newly installed plastic gravity sewer line according to UNI-B-6 / ASTM F1417 standards, what is the standard test pressure drop monitored after stabilization?
5What is the maximum allowable internal vertical deflection limit for flexible thermoplastic sewer pipe (such as PVC SDR 35) when tested with a rigid mandrel after backfilling?
6According to standard sewer design codes, an external drop manhole assembly is required when the vertical elevation difference between the incoming sewer invert and the outgoing sewer invert exceeds:
7In Manning's equation for storm drain capacity, how does replacing corrugated metal pipe (n = 0.024) with smooth-interior high-density polyethylene (n = 0.012) affect flow capacity at the same slope and diameter?
8Under ASTM D2321 for flexible sewer pipe embedment, which soil class consists of angular, crushed stone (such as 1/4 inch to 1-1/2 inch washed rock) providing maximum pipe support with minimal compaction effort?
9What primary advantage does Vitrified Clay Pipe (VCP) possess when installed in municipal industrial sanitary sewer mains exposed to biogenic sulfuric acid corrosion?
10A sewer plan lists the rim elevation of Manhole MH-10 as 1,250.00 feet. The depth from the top of the manhole rim to the pipe invert is 8.50 feet. What is the invert elevation of MH-10?
About the Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Exam
The Arizona ROC A-12 (CR-80) Sewers, Drains and Pipe Laying trade examination evaluates candidates on the technical, legal, and safety standards required to construct, alter, or repair underground pipelines for sewers, storm drains, water mains, fuel gas, and septic systems. The computer-based test is open-book, allowing candidates to bring approved code books and reference texts into the PSI test center.
Assessment
80 multiple-choice questions covering Sewers & Storm Drains (25%), Excavation & Backfilling (25%), Water Piping (12.5%), Gas Piping (12.5%), General Piping (6.25%), Septic Systems (6.25%), Safety (6.25%), and Welding (6.25%).
Time Limit
210 minutes
Passing Score
70%
Exam Fee
$66 (Arizona Registrar of Contractors / PSI Services LLC)
Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Exam Content Outline
Sewers and Storm Drain Systems
Sewer main installation, gravity sewer hydraulics, invert elevations, drop manholes, PVC (SDR 35/C900), Ductile Iron Pipe (DIP), Reinforced Concrete Pipe (RCP), Vitrified Clay Pipe (VCP), trenchless pipe bursting, storm drain culverts, headwalls, catch basins, low-pressure air testing (UNI-B-6), and mandrel deflection testing.
Excavation and Backfilling
OSHA 1926 Subpart P trenching rules, soil classification (Type A, B, C), unconfined compressive strength testing, sloping, benching, hydraulic shoring, trench boxes, pipe bedding, backfill placement, lift thickness, Standard and Modified Proctor compaction density testing, spoil pile setback, and ladder egress.
Water Piping
Water main installation standards (AWWA C600/C900), ductile iron pipe classes, HDPE pipe fusion, concrete thrust blocks, mega-lugs, hydrostatic pressure testing formulas, disinfection & chlorination (AWWA C651 continuous feed/slug methods), gate valves, fire hydrants, and backflow prevention.
Gas Piping
Underground polyethylene (PE) and steel fuel gas distribution lines, NFPA 54 / IFGC standards, 18 AWG insulated tracer wire, yellow caution warning tape, sacrificial anode cathodic protection, butt fusion, pressure testing minimums, line purging, and depth of cover requirements.
General Piping
Pipe sizing, Schedule 40/80 and SDR ratings, Hazen-Williams friction loss calculations, expansion joints, pipe hangers and supports, fitting layout (bends, tees, wyes), solvent welding, mechanical couplings, and material thermal expansion.
Septic Systems
ADEQ Title 18 Chapter 9 onsite wastewater regulations, septic tank volume sizing based on daily design flow, two-compartment baffles, effluent filters, percolation rate (MPI) testing, leach field absorption trench sizing, distribution boxes, and environmental setback distances.
Safety
OSHA 1926 Subpart P, Arizona 811 (Blue Stake) utility locate protocols (2-working-day notice, 24-inch tolerance zone), confined space entry in sewer structures (OSHA Subpart AA testing for O2, H2S, flammable gases), mechanical ventilation, fall protection, and personal protective equipment.
Welding
Steel pipe joint welding per AWS D1.1 / API 1104, weld joint bevel prep, SMAW stick welding (E6010 root pass, E7018 fill/cap), GTAW, plastic pipe fusion welding (HDPE heating temperature 400°F-450°F, heat/cool cycle parameters), non-destructive testing (NDT), and welder qualification.
How to Pass the Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Exam
What You Need to Know
- Passing score: 70%
- Assessment: 80 multiple-choice questions covering Sewers & Storm Drains (25%), Excavation & Backfilling (25%), Water Piping (12.5%), Gas Piping (12.5%), General Piping (6.25%), Septic Systems (6.25%), Safety (6.25%), and Welding (6.25%).
- 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
Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Study Tips from Top Performers
Frequently Asked Questions
What work is covered under the Arizona ROC A-12 / CR-80 license classification?
The A-12 (General Engineering Dual) / CR-80 (Commercial) classification permits the installation, alteration, and repair of underground pipelines for sewers, storm drains, water mains, fuel gas piping, septic systems, irrigation lines, manholes, catch basins, and associated trenching, backfilling, and pipe welding.
How many questions are on the official AZ ROC A-12 exam and what is the passing score?
The official PSI trade exam contains 80 scored multiple-choice questions. Candidates are allowed 210 minutes (3.5 hours) and must achieve a score of at least 70% (56 correct answers) to pass.
Is the Arizona ROC A-12 trade examination open-book?
Yes. The exam is open-book. Candidates may bring approved reference materials into the PSI testing center, including standard plumbing/piping codes (UPC/IPC), OSHA 1926 standards, AWWA standards, and pipe installation handbooks.
What are the OSHA trenching and soil classification rules tested on the exam?
The exam heavily tests OSHA 1926 Subpart P: Type A soil (unconfined compressive strength ≥ 1.5 tsf, max slope 3/4:1), Type B soil (0.5 to 1.5 tsf, max slope 1:1), and Type C soil (≤ 0.5 tsf, max slope 1-1/2:1). Spoil piles must be kept at least 2 feet from trench edges, and ladders must be placed within 25 feet of lateral travel in trenches 4 feet or deeper.
Do I need to take a separate exam for Arizona statutes and rules?
Yes. In addition to the A-12 / CR-80 trade examination, license applicants must pass the Arizona Registrar of Contractors Statutes and Rules Examination (SRE).