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100+ Free NV C-37B Solar Space Heating Practice Questions

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2026 Statistics

Key Facts: NV C-37B Solar Space Heating Exam

45 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

32 of 45 points

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 C-37B Solar Space Heating Contractor Examination is the official NSCB/PSI open book exam: 45 questions, 32 of 45 points, 1.5 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-37B Solar Space Heating Practice Questions

Try these sample questions to test your NV C-37B Solar Space Heating exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under NAC 624.540, which piping is within the Nevada C-37B Solar Space Heating scope?
A.Only potable fixture branch piping to lavatories and showers
B.Only swimming-pool circulation piping and chlorinator loops
C.Photovoltaic DC homeruns from modules to an inverter
D.Piping that carries solar-heated water or air used to heat structures, including storage and heat-exchanger connections
Explanation: NAC 624.540(2)(b) authorizes C-37B to install systems that collect solar energy to heat water or air used to heat structures housing persons, animals, or objects, including storage, piping, and heat exchangers. Pool equipment is excluded. Fixture plumbing is C-37A/C-1D work, and PV is not a C-37B thermal system.
2Which copper tube type is the usual choice for a pressurized glazed-collector hydronic space-heating loop under the 2018 UPC materials rules?
A.Type M DWV copper used for waste stacks
B.Type L or K copper water tube listed in UPC Chapter 6 for hot-water distribution
C.Soft 50/50 lead-tin waste solder over Type M refrigeration tube
D.Unlisted thin-wall automotive heater hose
Explanation: UPC Chapter 6 lists Type L and Type K copper water tube for hot-water distribution. Collector-loop fluid regularly exceeds 180°F and can stagnate much hotter, so listed copper water tube with high-temperature joints is the standard C-37B collector material. DWV copper and 50/50 solder are waste-system products, not hydronic solar loop materials.
3Per 2018 UPC Table 313.3, horizontal copper or copper-alloy tubing 1-1/2 inches and smaller in a solar space-heating loop shall be supported at intervals not exceeding:
A.32 inches
B.4 feet
C.6 feet
D.12 feet
Explanation: Table 313.3 limits horizontal copper and copper-alloy tubing 1-1/2 inches and smaller to 6 feet. Copper 2 inches and larger may go 10 feet. Vertical copper is supported at each floor, not more than 10 feet. Do not apply the 32-inch PEX row or the 12-foot steel water row to copper collector tube.
4Per 2018 UPC Table 313.3, horizontal PEX tubing 1 inch and smaller used in a hydronic radiant floor shall be supported at least every:
A.32 inches
B.6 feet
C.10 feet
D.12 feet
Explanation: Table 313.3 requires 32-inch horizontal spacing for PEX 1 inch and smaller, and 4 feet for 1-1/4 inch and larger. PEX is flexible; copper or steel hanger spacing lets it sag, kink, and trap air. Vertical PEX needs a mid-story guide and expansion every 30 feet.
5In a drainback solar space-heating collector loop, supply and return piping must be pitched so the collectors empty when the pump stops. The FSEC solar manual practice slope is at least:
A.1/8 inch per foot toward the drainback reservoir, with no traps
B.1/4 inch per foot toward the drainback reservoir, with no traps or uphill pockets
C.Level piping is required so the pump does not lose prime
D.1 inch per foot toward the collectors so they stay full of water
Explanation: FSEC drainback design requires a continuous fall of about 1/4 inch per foot from the collectors back to the indoor reservoir so every tube empties by gravity. Traps, belly sags, and uphill fittings leave standing water that freezes. Level or reverse pitch defeats drainback freeze protection.
6Outdoor collector-loop piping on a C-37B hydronic space-heating system should be insulated primarily to:
A.Increase the pipe pressure rating so Type M copper can replace Type L
B.Reduce heat loss between the collectors and the indoor storage or heat exchanger, and to limit freeze risk on residual fluid
C.Replace the need for a vapor retarder on chilled-water piping
D.Allow PVC Schedule 40 to be used on the roof
Explanation: FSEC and energy practice require insulation on outdoor collector supply and return so winter space-heating energy is not dumped to the wind before it reaches the slab or storage tank. Insulation also slows freeze-up of residual fluid. It does not change pipe pressure ratings or legalize PVC on a hot collector loop.
7When copper collector-loop tubing is joined to galvanized steel tank fittings, the 2018 UPC requires which fitting?
A.A sanitary tee turned on its back
B.A dielectric union or other listed dielectric fitting
C.A no-hub shielded coupling
D.A PVC solvent-weld adapter
Explanation: UPC 605.15 / 605.16 require a dielectric union or other listed dielectric fitting when copper or copper-alloy tube joins galvanized steel. Without it, galvanic current consumes the steel in the glycol or water loop. DWV couplings and PVC adapters are the wrong system and the wrong materials.
8Per 2018 UPC Table 313.3, horizontal threaded or welded steel pipe 1 inch and larger used as a hydronic space-heating header shall be supported at intervals not exceeding:
A.6 feet
B.8 feet
C.10 feet
D.12 feet
Explanation: Table 313.3 lists 12 feet as the maximum horizontal spacing for steel pipe 1 inch and larger in water service. Steel 3/4 inch and smaller is limited to 10 feet. Do not use the fuel-gas support row (6, 8, or 10 feet) on a hydronic water header.
9Why is CPVC generally unacceptable as the outdoor glazed-collector loop on a C-37B space-heating system?
A.CPVC cannot be solvent-cemented
B.Collector loops routinely exceed CPVC's continuous temperature rating and can stagnate well above 200°F
C.CPVC is listed only for medical-gas service
D.The 2018 UPC bans all plastic pipe inside buildings
Explanation: Listed CPVC water tube is typically rated near 180°F continuous. A glazed space-heating collector sitting in Nevada sun with the pump off can stagnate at 250–400°F, which collapses or ruptures CPVC. Copper (or steel) is the collector-loop material; CPVC or PEX belongs on the cooler hydronic-floor side after a mixing valve.
10Which joining method is appropriate for Type L copper in a high-temperature solar collector space-heating loop?
A.50/50 tin-lead solder, the same as DWV copper
B.Brazing or a high-temperature solder/alloy listed for the expected collector fluid temperature
C.PVC primer and cement
D.Duct tape over a slip fit
Explanation: Collector fluid regularly exceeds the service temperature of 50/50 solder. FSEC installation practice and UPC material listings require joints rated for the fluid temperature — typically brazing or a high-temperature alloy. Soft lead-tin solder remelts or weakens when a glazed collector stagnates.

About the NV C-37B Solar Space Heating Exam

The Nevada C-37B Solar Space Heating Contractor Examination is the official Nevada State Contractors Board trade examination administered by PSI Services LLC. The official exam has 45 scored questions. Passing is 32 of 45 points in 1.5 hours. The examination is open book. Uniform Plumbing Code, 2018 (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin 270, 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.

Assessment

Open Book computer-based multiple-choice. Uniform Plumbing Code, 2018 (allowed in center)

Time Limit

1.5 hours

Passing Score

32 of 45 points

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV C-37B Solar Space Heating Exam Content Outline

22%

Piping

Piping (10 items)

33%

System Design

System Design (15 items)

11%

Pumps and Storage Systems

Pumps and Storage Systems (5 items)

16%

Collectors

Collectors (7 items)

7%

System Valves and Controls

System Valves and Controls (3 items)

11%

Safety

Safety (5 items)

How to Pass the NV C-37B Solar Space Heating Exam

What You Need to Know

  • Passing score: 32 of 45 points
  • Assessment: Open Book computer-based multiple-choice. Uniform Plumbing Code, 2018 (allowed in center)
  • Time limit: 1.5 hours
  • Exam fee: USD 95

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

NV C-37B Solar Space Heating Study Tips from Top Performers

1Distribute study time to the official bulletin 270 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 C-37B Solar Space Heating Contractor Examination?

The official PSI examination has 45 scored questions. Passing is 32 of 45 points within 1.5 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-37B 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 C-37B exam open book?

Yes. PSI lists this examination as open book. Uniform Plumbing Code, 2018 (allowed in center)

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.