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100+ Free NV C-38 Gas Equipment Practice Questions

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2026 Statistics

Key Facts: NV C-38 Gas Equipment Exam

50 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

2 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-38 Gas Equipment Contractor Examination is the official NSCB/PSI open book exam: 50 questions, 70% (35 of 50 points), 2 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-38 Gas Equipment Practice Questions

Try these sample questions to test your NV C-38 Gas Equipment exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under NAC 624.550, which work is inside the Nevada C-38 Gas Equipment classification?
A.Insulation of pipes and ducts only, with no gas connections
B.Installing piping from an LP or natural-gas supply into a building and the related vents, installing appliances that require an LP or natural-gas connection, and fabricating systems that heat and circulate air with LP or natural gas
C.Installing only building gas piping and vents, with no appliance or air-heating equipment
D.Any electrical service work associated with a gas furnace
Explanation: NAC 624.550 defines C-38 as installing pipes from an LP or natural-gas supply into a building and related vents; installing appliances and equipment that need an LP or natural-gas connection; and fabricating or installing systems that heat air with LP or natural gas and circulate that air. C-1G is the narrower pipes-and-vents classification. Electrical service is not a C-38 trade.
2UMC 2018 Schedule 40 metallic-pipe sizing tables for natural gas are computed for which specific gravity?
A.0.60
B.1.00
C.1.50
D.2.00
Explanation: UMC 2018 Table 1315.2(1) and the related natural-gas tables use a specific gravity of 0.60. Natural gas is lighter than air, so a leak rises. The 1.50 gravity is the undiluted-propane table basis; using it on a natural-gas job selects the wrong family of capacities.
3For a natural-gas system other than undiluted LP-gas, UMC 2018 treats the point of delivery as:
A.The utility main in the street
B.The outlet of the service meter assembly or the outlet of the service regulator, whichever is farther downstream
C.The first appliance shutoff inside the building
D.The inlet of a customer-owned second-stage regulator
Explanation: UMC 2018 Chapter 13 covers piping from the point of delivery to the appliance connections. For natural gas that point is the outlet of the service meter assembly or the outlet of the service regulator, whichever is farther downstream. Everything upstream is serving-gas-supplier piping, not C-38 building piping.
4Unless a listed outdoor-appliance exception applies, underground fuel-gas piping shall have a minimum cover of:
A.6 inches below finished grade
B.8 inches below finished grade
C.12 inches below finished grade
D.36 inches below finished grade at frost line only
Explanation: UMC 2018 1310.1.1 requires not less than 12 inches of cover on underground gas piping. Where external damage is likely, cover increases to 18 inches, or the pipe is installed in conduit or bridged. Twelve inches is the ordinary C-38 burial minimum.
5Polyethylene (PE) plastic fuel-gas pipe is permitted in which location?
A.Concealed in an interior partition chase
B.Outdoors, underground only, with a listed transition (typically an anodeless riser) where the pipe comes above grade
C.Exposed along an exterior building wall
D.Inside a mechanical room if it is sleeved in Schedule 40 steel
Explanation: UMC 2018 limits plastic gas pipe to outdoor underground use. Where the pipe must rise above grade it terminates in a listed premanufactured anodeless riser or service-head adapter. Plastic pipe shall not be used inside or under a building except for those listed riser/adapter exceptions.
6A yellow-jacket CSST natural-gas piping system installed in a building shall be bonded to the electrical-service grounding electrode system with a jumper not smaller than:
A.14 AWG copper
B.10 AWG copper
C.6 AWG copper or equivalent
D.1/0 AWG copper
Explanation: UMC 2018 1311.2 requires CSST gas piping, and systems containing any CSST segment, to be electrically continuous and bonded to the electrical-service grounding electrode system. The bonding jumper shall not be smaller than 6 AWG copper or equivalent. Gas piping shall not be used as a grounding electrode.
7Each gas appliance shall have an accessible approved manual shutoff valve in the same room and within what maximum distance of the appliance, installed upstream of any connector?
A.3 feet
B.6 feet
C.10 feet
D.25 feet if the valve is readily accessible
Explanation: UMC 2018 1312.5 requires an accessible approved manual shutoff with a nondisplaceable valve member, or a listed gas convenience outlet, within 6 feet of the appliance it serves. Where a connector is used the valve is upstream of the connector. A meter valve does not replace the appliance shutoff.
8Thread joint compounds used on fuel-gas pipe threads shall be:
A.Ordinary PTFE tape of any color
B.Resistant to the action of LP-gas or any other chemical constituents of the gases to be conducted
C.Oil-based pipe dope formulated for potable water only
D.Prohibited; dry threads are required
Explanation: UMC 2018 1308.5.8 requires thread compounds to resist LP-gas and the other chemical constituents of the gas. A water-pipe dope can dissolve in hydrocarbon gas and leak. Metallic pipe threads are taper pipe threads complying with ASME B1.20.1.
9An approved individual underground line serving only an outdoor grill, gas light, or similar outdoor appliance, in a location not subject to physical damage, may be installed with a minimum cover of:
A.4 inches
B.8 inches
C.12 inches with no exception
D.18 inches
Explanation: UMC 2018 allows individual outdoor-appliance lines to be buried not less than 8 inches below finished grade when the installation is approved and is not in a location susceptible to physical damage. The general 12 inch rule still applies to building services and to any line that can be damaged.
10An underground nonmetallic fuel-gas pipe shall have a tracer that is not smaller than:
A.14 AWG bare aluminum, laid on top of the backfill
B.18 AWG yellow insulated copper wire, or another approved conductor, installed adjacent to the pipe with an accessible above-grade termination at each end
C.6 AWG bare copper, bonded to the electrical grounding electrode
D.No tracer is required if the pipe is PE listed for gas
Explanation: UMC 2018 requires a yellow insulated copper tracer wire, or another approved conductor, adjacent to underground nonmetallic piping, not smaller than 18 AWG, with access to the tracer above grade at each end. The yellow insulation type must be suitable for direct burial. The tracer locates the plastic line; it is not a bonding jumper.

About the NV C-38 Gas Equipment Exam

The Nevada C-38 Gas Equipment Contractor Examination is the official Nevada State Contractors Board trade examination administered by PSI Services LLC. The official exam has 50 scored questions. Passing is 70% (35 of 50 points) in 2 hours. The examination is open book. Uniform Mechanical Code, 2018 and NFPA 58, 2014 (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 Mechanical Code, 2018 and NFPA 58, 2014 (allowed in center)

Time Limit

2 hours

Passing Score

70% (35 of 50 points)

Exam Fee

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

NV C-38 Gas Equipment Exam Content Outline

24%

Natural Gas Piping

Natural Gas Piping (12 items)

24%

LP Gas Piping

LP Gas Piping (12 items)

20%

Chimneys, Flues and Vents

Chimneys, Flues and Vents (10 items)

10%

Appliance Installation

Appliance Installation (5 items)

10%

Sizing and Estimating

Sizing and Estimating (5 items)

6%

Testing and Inspection

Testing and Inspection (3 items)

6%

Combustion Air

Combustion Air (3 items)

How to Pass the NV C-38 Gas Equipment Exam

What You Need to Know

  • Passing score: 70% (35 of 50 points)
  • Assessment: Open Book computer-based multiple-choice. Uniform Mechanical Code, 2018 and NFPA 58, 2014 (allowed in center)
  • Time limit: 2 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-38 Gas Equipment 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-38 Gas Equipment Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50 points) within 2 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-38 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-38 exam open book?

Yes. PSI lists this examination as open book. Uniform Mechanical Code, 2018 and NFPA 58, 2014 (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.