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Key Facts: NV A-10B Residential Spas Exam

40 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1.5 hours

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada A-10B Residential Spas Contractor Examination is the official NSCB/PSI open book exam: 40 questions, 70% (28 of 40 points), 1.5 hours, USD 95 (bulletin 291, updated 3/25/2026). Official delivery: English.

Sample NV A-10B Residential Spas Practice Questions

Try these sample questions to review concepts for the NV A-10B Residential Spas exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What does spa turnover time measure?
A.The time needed to circulate a volume of water equal to the spa capacity through the filtration system
B.The time needed to raise spa water 10°F
C.The time a bather may legally remain in water at 104°F
D.The time between required spa drain-and-refill cycles
Explanation: Turnover time is the period required to circulate a volume of water equal to the spa's capacity through the circulation and filtration system. USPSHTC 2018 Chapter 5 treats turnover as a water-quality design control because hot, heavily loaded spa water must be filtered and disinfected quickly. Flow rate is sized from volume divided by the required turnover period.
2Under USPSHTC 2018 water-quality practice and ANSI/APSP residential spa standards, what maximum turnover time is used to size a residential spa circulation system?
A.30 minutes
B.15 minutes
C.2 hours
D.6 hours
Explanation: Spas and hot tubs are small, hot, high-bather-load vessels. USPSHTC 2018 Chapter 5 and APSP spa standards size the filtration circulation system for a 30-minute turnover so the entire water volume is filtered twice an hour. A 6-hour turnover is a swimming-pool figure and leaves spa water under-circulated.
3A residential spa holds 600 gallons. What minimum circulation flow rate is required for a 30-minute turnover?
A.10 gpm
B.15 gpm
C.20 gpm
D.30 gpm
Explanation: Required flow rate equals spa volume divided by turnover time in minutes: 600 gallons ÷ 30 minutes = 20 gpm. The pump, pipe, and filter must all be able to deliver at least this design flow with a clean filter. Hydrotherapy jet flow is additional and must not be counted as filtration turnover unless the system is specifically designed that way.
4A rectangular residential spa is 8 feet long, 6 feet wide, and has an average water depth of 3.5 feet. Using 7.5 gallons per cubic foot, what is the water volume?
A.840 gallons
B.1,008 gallons
C.1,260 gallons
D.1,680 gallons
Explanation: Volume in gallons = length × width × average depth × 7.5. Compute 8 × 6 = 48 square feet of surface, 48 × 3.5 = 168 cubic feet, and 168 × 7.5 = 1,260 gallons. Contractor exams use 7.5 gal/ft³ as the working conversion (the precise factor is 7.48).
5Which filter type uses a cake of fossilized diatomaceous earth on septa or grids to trap fine particles?
A.High-rate sand filter
B.Cartridge filter
C.Diatomaceous earth (DE) filter
D.Rapid-rate gravity sand filter
Explanation: A DE filter coats grids or septa with diatomaceous earth, which provides very fine filtration, typically near 2 to 5 microns. Sand filters use a graded media bed, and cartridge filters use pleated fabric. USPSHTC 2018 Chapter 5 requires filters to be listed for pool or spa use and sized for the design flow.
6A spa circulation system is designed for 30 gpm. If a cartridge filter is rated at 0.375 gpm per square foot of media, what minimum filter area is required?
A.8 square feet
B.30 square feet
C.80 square feet
D.113 square feet
Explanation: Required filter area equals design flow divided by the allowable filter rate: 30 gpm ÷ 0.375 gpm/ft² = 80 square feet. Undersizing the cartridge raises differential pressure, shortens the cleaning interval, and can starve the heater and sanitizer loop. Always also stay within the filter manufacturer's listed flow.
7Why are spa suction lines usually sized larger than the return lines for the same design flow?
A.To keep suction velocity lower, reducing cavitation, hair entrapment risk, and pump strain
B.To raise suction velocity and improve skimming
C.Because PVC pressure ratings are lower on the suction side
D.So the heater will see a higher entering velocity
Explanation: Suction piping operates below atmospheric pressure. Higher suction velocity increases friction losses, cavitation risk, and hair-entrapment hazard at outlets. Public practice commonly limits suction to about 6 feet per second and returns to 8 feet per second; residential codes often allow up to 8 fps on both, but larger suction pipe is still the safer design. Velocity is always calculated at the design (maximum) flow.
8What is the primary job of a surface skimmer on a residential spa?
A.To draw floating debris and a surface layer of water into the filter so oils and dirt are removed
B.To provide the only legal suction outlet under the Virginia Graeme Baker Act
C.To equalize hydrostatic pressure under the spa shell
D.To mix concentrated acid into the circulation stream
Explanation: USPSHTC 2018 Section 510 covers surface skimmers. The floating weir pulls a thin surface layer, where oils, lotions, and debris collect, into the filter. Skimmers are not submerged suction outlets under the VGB Act. Hydrostatic relief and chemical feed are separate devices.
9USPSHTC 2018 Section 511 requires spa suction outlet fitting assemblies to comply with which standard?
A.ANSI/APSP/ICC-16 (SOFA) for listed suction outlet fitting assemblies
B.ASTM F1346 only
C.NSF/ANSI 50 for residential filters only
D.ACI 506 for shotcrete placement
Explanation: USPSHTC 2018 Section 511 and Chapter 10 reference APSP/ICC 16 for suction outlet fitting assemblies (SOFAs) used in pools, spas, and hot tubs. Covers must be listed, installed on a matching certified sump, and stay within the assembly's flow rating. Dual outlets on a common line, an unblockable outlet, or another APSP-7 entrapment-avoidance method is used so a single blockable drain cannot entrap a bather.
10On a two-pump residential spa, what is the correct split of duties between the circulation pump and the booster (jet) pump?
A.The circulation pump provides filtration, heating, and disinfection flow at all times; the booster pump supplies hydrotherapy turbulence without replacing that turnover
B.The booster pump provides the required 30-minute filtration turnover; the circulation pump runs only the air blower
C.Either pump may be used for filtration as long as total horsepower exceeds 2 hp
D.Both pumps must share one suction outlet cover
Explanation: APSP spa practice and USPSHTC equipment rules keep filtration independent of hydrotherapy. The circulation pump is sized for the 30-minute turnover through the filter, heater, and sanitizer. The booster pump feeds jets and must have its own listed suction outlets. A timer, if used, should start only the jet pump so filtration is not shut off when the jets time out.

About the NV A-10B Residential Spas Exam

The Nevada A-10B Residential Spas Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 40 scored questions. Passing is 70% (28 of 40 points) in 1.5 hours. The examination is open book. Approved center references include Uniform Swimming Pool, Spa and Hot Tub Code, 2018 (IAPMO). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Exam sponsor: PSI Services LLC (for the Nevada State Contractors Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Open Book computer-based multiple-choice. Uniform Swimming Pool, Spa and Hot Tub Code, 2018 (IAPMO)

Time Limit

1.5 hours

Passing Score

70% (28 of 40 points)

Exam / Certification Fees

USD 95

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

10%

Filtration/Circulation Systems

Spa circulation systems (4 items)

15%

Maintenance and Operation

Residential spa operation (6 items)

15%

Accessories and Associated Trades

Heaters, controls, and related trades (6 items)

8%

Pool and Spa Business Laws and Rules

Nevada spa contracting rules (3 items)

18%

Concrete, Shotcrete and Gunite

Spa shell construction (7 items)

20%

Design

Residential spa design (8 items)

15%

Soils and Earthwork

Soils and excavation (6 items)

Preparing for the NV A-10B Residential Spas Exam

What You Need to Know

  • Passing score: 70% (28 of 40 points)
  • Assessment: Open Book computer-based multiple-choice. Uniform Swimming Pool, Spa and Hot Tub Code, 2018 (IAPMO)
  • Time limit: 1.5 hours
  • Exam / certification fees: USD 95 Official sources

Using Our Practice Resources

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

NV A-10B Residential Spas: Suggested Study Strategy

1Distribute study time to the official bulletin 291 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada A-10B Residential Spas Contractor Examination?

The official PSI examination has 40 scored questions. Passing is 70% (28 of 40 points) within 1.5 hours (Candidate Information Bulletin 291, updated 3/25/2026).

How much does the NV A-10B Residential Spas exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV A-10B Residential Spas exam open book?

Yes. PSI lists this examination as open book. Uniform Swimming Pool, Spa and Hot Tub Code, 2018 (IAPMO)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.