PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free AZ ROC C-6 Swimming Pool Service and Repair Practice Questions

Prepare for the Arizona ROC C-6 Swimming Pool Service and Repair Examination exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free

Loading practice questions...

Same family resources

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.

Arizona ROC A (KA) Dual Engineering Examination

Practice Questions

Arizona ROC A General Engineering (Commercial) Examination

Practice Questions

Arizona ROC A-11/CR-17/R-17 Steel and Aluminum Erection Examination

Practice Questions

Arizona ROC A-12/CR-80 Sewers, Drains and Pipe Laying Examination

Practice Questions

Arizona ROC A-14 Asphalt Paving Examination

Practice Questions

Arizona ROC A-15 Seal Coating Examination

Practice Questions
2026 Statistics

Key Facts: AZ ROC C-6 Swimming Pool Service and Repair Exam

30 Questions

Official Exam Items

PSI Candidate Information Bulletin

75 Minutes

Time Allowed

PSI Candidate Information Bulletin

70%

Passing Score

Arizona Registrar of Contractors

$66

Exam Fee

PSI Services LLC

Open-Book Computer Test

Exam Format

PSI Services LLC

100 Questions

Practice Questions

OpenExamPrep Practice Bank

Prepare for the official Arizona ROC C-6 Swimming Pool Service and Repair trade exam with 100 practice questions. The official PSI computer-delivered open-book examination comprises 30 scored questions to be completed in 75 minutes with a 70% passing threshold ($66 fee). Note: These practice questions are an English-language MCQ study adaptation designed for self-assessment and exam readiness.

Sample AZ ROC C-6 Swimming Pool Service and Repair Practice Questions

Try these sample questions to test your AZ ROC C-6 Swimming Pool Service and Repair exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A pool technician is calculating the volume of a rectangular swimming pool measuring 30 feet in length and 15 feet in width. The shallow end depth is 3 feet and the deep end depth is 9 feet, sloping uniformly. What is the total water volume of the pool in gallons?
A.20,250 gallons
B.27,000 gallons
C.13,500 gallons
D.30,375 gallons
Explanation: To calculate the volume of a rectangular pool with a sloped bottom, multiply length × width × average depth × 7.5 gal/cu ft. Average depth = (3 ft + 9 ft) / 2 = 6 ft. Volume = 30 ft × 15 ft × 6 ft × 7.5 gal/cu ft = 20,250 gallons. This question is an English-language MCQ study adaptation for the Arizona ROC C-6 exam.
2A standard commercial high-rate sand filter has a effective filter surface area of 3.14 square feet. If industry standards limit the maximum filtration flow rate to 15 GPM per square foot of filter area, what is the maximum allowable circulation pump flow rate through this filter?
A.31.4 GPM
B.47.1 GPM
C.62.8 GPM
D.78.5 GPM
Explanation: Maximum allowable flow rate = Filter surface area × Maximum flow rate per sq ft. 3.14 sq ft × 15 GPM/sq ft = 47.1 GPM. Exceeding this flow rate causes channelization in the sand bed and reduces filtration efficiency.
3When recharging a 60-square-foot Diatomaceous Earth (DE) filter after backwashing, what is the standard recommended amount of DE powder to slurry and pre-coat onto the filter elements?
A.3.0 lbs to 4.5 lbs
B.12.0 lbs to 15.0 lbs
C.6.0 lbs to 9.0 lbs
D.1.5 lbs to 2.0 lbs
Explanation: Standard DE pre-coat recommendations require 1.0 lb to 1.5 lbs of DE powder per 10 square feet of filter surface area. For a 60 sq ft filter: 60 / 10 × 1.0 lb = 6.0 lbs (minimum) up to 60 / 10 × 1.5 lbs = 9.0 lbs (maximum).
4A technician is performing deep maintenance on heavily fouled cartridge filter elements covered in both organic oils and mineral scale. What is the correct order of chemical cleaning solutions to prevent permanently embedding scale into the fabric matrix?
A.Soak in degreasing solution first, rinse thoroughly, then soak in dilute muriatic acid solution
B.Soak in dilute muriatic acid solution first, rinse thoroughly, then soak in degreaser
C.Soak simultaneously in a mixed solution of muriatic acid and trisodium phosphate (TSP)
D.Pressure wash at 3,500 PSI using cold water with no chemical pre-soak
Explanation: Cartridges must always be degreased BEFORE acid washing. Soaking an oily cartridge in acid binds grease and body oils into the synthetic fabric pores, permanently ruining the element. Acid washing is performed second to dissolve calcium carbonate scale.
5A pool pump system reads a suction vacuum of 10 inches of mercury (in Hg) on the suction gauge and a discharge pressure of 20 pounds per square inch (PSI) on the filter pressure gauge. What is the Total Dynamic Head (TDH) of the circulation system in feet of head?
A.30.0 feet
B.46.2 feet
C.22.6 feet
D.57.5 feet
Explanation: Convert vacuum in Hg to feet of head: 10 in Hg × 1.13 ft/in Hg = 11.3 ft. Convert discharge PSI to feet of head: 20 PSI × 2.31 ft/PSI = 46.2 ft. Total Dynamic Head = Suction Head + Discharge Head = 11.3 ft + 46.2 ft = 57.5 feet of head.
6According to the affinity laws for centrifugal pool pumps, if a variable-speed pump's operating speed (RPM) is reduced by 50%, to what percentage of its original power consumption does the electric motor power drop?
A.50.0%
B.12.5%
C.25.0%
D.6.25%
Explanation: According to Affinity Law #3, power consumption varies with the cube of motor speed (P2/P1 = (N2/N1)^3). Reducing speed by 50% (0.50) yields (0.50)^3 = 0.125 or 12.5% of original power, resulting in an 87.5% energy savings.
7A commercial pool holds 48,000 gallons of water. Local health code requires a complete water turnover every 6 hours. What minimum flow rate in gallons per minute (GPM) must the circulation system maintain?
A.80 GPM
B.100 GPM
C.133.3 GPM
D.160 GPM
Explanation: Required GPM = Pool Volume / (Turnover Time in hours × 60 min/hr). GPM = 48,000 / (6 × 60) = 48,000 / 360 = 133.33 GPM.
8A pool circulation pump is emitting a loud noise resembling gravel or marbles rattling inside the pump housing, accompanied by high suction vacuum gauge readings. What condition is occurring and what is the primary cause?
A.Pump cavitation caused by severe suction-side restriction such as a clogged skimmer or closed suction valve
B.Motor bearing failure caused by electrical over-voltage
C.Discharge over-pressurization caused by a dirty filter or closed return valve
D.Air binder lock caused by an air leak in the pump strainer lid O-ring
Explanation: Cavitation occurs when suction restriction lowers fluid pressure below water's vapor pressure, forming vapor bubbles that violently collapse against the impeller, creating a distinct sound like marbles inside the housing.
9What is the standard recommended pressure differential indicator that alerts a pool service technician that a sand or DE filter requires backwashing?
A.1 to 3 PSI drop below clean operating pressure
B.25 to 30 PSI increase above clean operating pressure
C.15 to 20 PSI drop below clean operating pressure
D.8 to 10 PSI increase above clean operating pressure
Explanation: A filter should be backwashed when the pressure gauge reads 8 to 10 PSI higher than the baseline clean operating pressure established after the last thorough backwash or cleaning.
10What is the primary function of the floating weir door installed in a surface skimmer throat?
A.To regulate pump suction flow and prevent pump cavitation
B.To increase surface water velocity into the skimmer and prevent trapped floating debris from washing back into the pool when the pump stops
C.To equalize water level between the skimmer bucket and main drain line
D.To prevent large debris like leaves from entering the skimmer basket
Explanation: The floating weir creates a thin, high-velocity sheet of surface water skimmed into the housing and acts as a check valve to trap floating debris inside the skimmer well when the pump shuts off.

About the AZ ROC C-6 Swimming Pool Service and Repair Exam

The Arizona ROC C-6 Swimming Pool Service and Repair Examination is a computer-delivered, open-book trade exam administered by PSI Services LLC for contractors seeking licensing with the Arizona Registrar of Contractors. The C-6 classification authorizes contractors to service, maintain, and repair existing residential and commercial swimming pools, spas, and hot tubs. Scope includes water chemistry treatment, filtration and pump maintenance/replacement, heater servicing, replastering and resurfacing, tile and coping repairs, structural shell crack stitching, leak detection, and equipment electrical bonding per NEC Article 680. The exam consists of 30 scored multiple-choice questions with a 75-minute time limit and a passing score of 70%.

Questions

30 scored questions

Time Limit

75 minutes

Passing Score

70%

Exam Fee

$66 (Arizona Registrar of Contractors / PSI Services LLC)

AZ ROC C-6 Swimming Pool Service and Repair Exam Content Outline

27%

Filtration and Circulation Systems

Sand, cartridge, and DE filter operation, pump sizing, total dynamic head (TDH), hydraulics, valves, piping, backwashing, and turnover rates.

20%

Maintenance and Operation

Water chemistry, Langelier Saturation Index (LSI), sanitizer dosing, pH/alkalinity balancing, breakpoint chlorination, testing protocols, and seasonal maintenance.

13%

Accessories and Associated Trades

Gas/electric/solar heaters, salt chlorine generators, automatic cleaners, electrical bonding (NEC 680), low-voltage lighting, and backflow prevention.

13%

Plaster

Marcite and aggregate plaster application, surface prep, hydrational curing, acid washing, delamination repair, hollow spot detection, and chemical etching.

17%

Pool Repairs

Structural shell crack repair, tile/coping replacement, leak detection techniques, expansion joints, pipe repair, and underwater patching.

10%

OSHA Safety

Hazard communication, SDS handling, PPE for hazardous pool chemicals, lockout/tagout, trenching/excavation, VGB Act compliance, and electrical safety.

How to Pass the AZ ROC C-6 Swimming Pool Service and Repair Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 30 questions
  • Time limit: 75 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 C-6 Swimming Pool Service and Repair Study Tips from Top Performers

1Master Langelier Saturation Index (LSI) calculations and know how pH, temperature, calcium hardness, cyanuric acid, and total alkalinity shift water between corrosive and scaling states.
2Understand filter hydraulics and turnover calculations, including GPM requirements, sand filter backwash rates, and DE powder pre-coat ratios.
3Review NEC Article 680 requirements for equipotential bonding grids (#8 AWG solid copper), GFCI protection, underwater luminaire junction box heights, and grounding.
4Study pool plastering and surface prep techniques, including keyway cut depth (3/8" to 1/2"), acid wash neutralization, and hydration curing requirements.
5Memorize OSHA safety standards (29 CFR 1910 and 1926) for chemical safety, SDS pictograms, respirator selection, and VGB Act suction entrapment prevention rules.

Frequently Asked Questions

What work can a licensed Arizona ROC C-6 contractor perform?

An Arizona C-6 contractor is licensed to service, maintain, and repair existing swimming pools, spas, and hot tubs. This includes water chemistry treatment, filter/pump servicing and replacement, heater repair, pool replastering/resurfacing, tile/coping repair, crack repair, leak detection, and equipment bonding.

How many questions are on the AZ ROC C-6 trade exam and what is the passing score?

The official PSI trade exam contains 30 scored multiple-choice questions. Candidates are given 75 minutes to complete the test, and a passing score of 70% (21 out of 30 correct) is required.

Is the Arizona ROC C-6 exam open-book?

Yes, the examination is open-book. Candidates are permitted to bring approved reference materials into the PSI testing center, such as approved trade reference manuals, code books, and safety guidelines, provided they are permanently bound and highlighted/tabbed according to PSI rules.

What is the cost of taking the Arizona ROC C-6 trade exam?

The examination fee for the C-6 trade portion is $66, payable directly to PSI Services LLC during exam registration.

Do I need to pass any other exams to get licensed in Arizona?

Yes, in addition to the C-6 Trade Examination, applicants must pass the Arizona ROC Statutes and Rules Management Exam (SRE) unless qualified for a waiver based on prior licensing.