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100+ Free NV C-37 Solar Practice Questions

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2026 Statistics

Key Facts: NV C-37 Solar 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-37 Solar 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-37 Solar Practice Questions

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

1For a glazed flat-plate collector loop serving potable or glycol solar water heating under C-37 practice, which piping material is the usual choice because it can survive collector stagnation temperatures of 300°F and higher?
A.Schedule 40 PVC
B.PEX-A rated only to 180°F
C.ABS DWV
D.Type L copper tube
Explanation: Glazed collectors routinely stagnate above 300°F. Type L copper is the FSEC and UPC-compatible tube for those loops. PVC, ABS, and ordinary PEX are not listed for stagnation temperatures and can melt, collapse, or leach.
2Which piping material is accepted on an unglazed C-37D-type solar pool array where water temperatures stay near pool temperature?
A.Schedule 40 PVC sized for the array flow
B.Thin-wall DWV PVC used as a pressure line
C.Unlisted garden hose
D.Type M copper with 50/50 solder and no insulation
Explanation: Unglazed pool collectors run near 80–110°F, so Schedule 40 PVC pressure pipe is the FSEC-standard header material. DWV pipe is not a pressure listing. Copper is legal but uncommon and still needs UV-protected insulation if used outdoors.
3Per 2018 UPC Table 313.3, horizontal copper or copper-alloy tubing 1-1/2 inches and smaller on a solar collector loop shall be supported at intervals not exceeding which spacing?
A.4 feet
B.12 feet
C.10 feet
D.6 feet
Explanation: Table 313.3 lists 6 feet as the maximum horizontal hanger spacing for copper 1-1/2 inches and smaller. Typical C-37 collector loops are 1/2 inch to 1 inch Type L, so the 6-foot row applies. Vertical copper is supported at each floor, not more than 10 feet.
4A drainback C-37 water- or space-heating array must empty by gravity when the pump stops. What continuous slope does FSEC practice require on collectors and outdoor piping?
A.Level piping is acceptable if the pump is oversized
B.A high point in the middle of the array so water splits both ways
C.2 inches per foot toward the street
D.1/4 inch per foot back to the indoor drainback reservoir
Explanation: Drainback freeze and over-temperature protection only works if every collector riser and outdoor line pitches continuously to the indoor reservoir. FSEC practice is 1/4 inch per foot. A sag or a mid-array high point traps water that freezes or boils.
5Outdoor solar supply and return piping on a C-37 glazed system shall be insulated and then protected how?
A.Left bare so the sun can add extra heat
B.Buried without insulation if the trench is 6 inches deep
C.Wrapped only with duct tape at the hangers
D.Covered with a UV-resistant jacket or coating so the insulation does not degrade
Explanation: FSEC and energy practice insulate collector-loop piping to cut night losses and roof-level heat loss. Outdoor insulation must have a UV-resistant jacket or coating; bare foam crumbles in Nevada sun within a season. Bare pipe also creates a burn hazard.
6Per 2018 UPC Sections 605.15 and 605.16, copper solar tubing joined to galvanized steel tank fittings shall include which fitting?
A.A dielectric union or other listed dielectric fitting
B.A no-hub soil coupling
C.A sanitary tee laid on its back
D.A PVC female adapter solvent-welded to the copper
Explanation: Dissimilar-metal joints between copper and galvanized steel need a dielectric union or other listed dielectric fitting. Without it, galvanic current consumes the steel. Plastic DWV fittings are not dielectric water fittings.
7Why is CPVC generally rejected for the outdoor run of a glazed C-37 collector loop even though it is a hot-water plumbing plastic?
A.CPVC cannot be solvent-welded
B.The UPC bans all plastic on any solar job including unglazed pools
C.CPVC is only listed for underground gas
D.Collector stagnation temperatures exceed the CPVC pressure-temperature rating
Explanation: CPVC pressure ratings fall quickly as temperature rises and are not written for 300–400°F stagnation. A dry, sun-struck glazed collector will over-temperature CPVC joints. Unglazed pool arrays at pool temperature are a different service and commonly use PVC.
8A C-37 glazed array of four collectors is piped reverse-return (Tichelmann). What is the purpose of that layout?
A.To make the first collector receive all the flow
B.To convert the system from thermal to photovoltaic
C.To drain only the last collector in a freeze
D.To give each collector nearly the same total supply-plus-return path length so flow balances without a separate balancing valve on every panel
Explanation: Reverse-return piping sends supply into the first collector and takes return from the last so each panel sees a similar equivalent length. FSEC uses it on parallel glazed and pool arrays to avoid starving the far collectors. It is a piping-balance method, not a freeze or PV feature.
9Compared with piping glazed collectors in parallel, piping two collectors in series is chosen when the designer wants which result?
A.A larger flow and a smaller temperature rise through the pair
B.A legal substitute for a T&P valve
C.Automatic freeze protection without slope or glycol
D.A smaller flow through each absorber and a larger temperature rise, useful on a solar-AC or winter space-heat load
Explanation: Series flow sends the same gallons through both absorbers, so each sees less local flow and the pair delivers a higher ΔT. FSEC and solar-AC practice use that when the load needs 160–200°F water. Parallel flow is preferred for ordinary DHW because it keeps each collector near the rated flow and a modest rise.
10Long copper collector headers on a hot Nevada roof need expansion accommodation because copper grows about 1.1 inches per 100 feet per 100°F. Which installation detail is correct?
A.Anchor the pipe rigidly at every rafter with no slack
B.Switch the entire glazed loop to Schedule 40 PVC so it will not expand
C.Fill the pipe with sand so it cannot move
D.Provide expansion loops, offsets, or swing joints and do not lock the pipe at both ends
Explanation: A 100-foot copper run that swings 180°F grows roughly 2 inches. FSEC and UPC Chapter 3 require the pipe to be able to move — loops, offsets, or swing joints — while hangers guide rather than clamp. Rigid anchors at both ends fatigue joints and tear roof flashings.

About the NV C-37 Solar Exam

The Nevada C-37 Solar 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-37 Solar 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-37 Solar 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-37 Solar 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-37 Solar 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-37 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-37 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.