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100+ Free NV C-1D Plumbing Practice Questions

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2026 Statistics

Key Facts: NV C-1D Plumbing Exam

80 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

3 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-1D Plumbing Contractor Examination is the official NSCB/PSI open book exam: 80 questions, 70% (56 of 80 points), 3 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English and Spanish.

Sample NV C-1D Plumbing Practice Questions

Try these sample questions to test your NV C-1D Plumbing exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Per the 2018 UPC Section 1213.3 allowed on the Nevada C-1D exam, a new low-pressure fuel-gas piping system (not welded, operating at not more than 14 inches water column) shall stand an air, carbon dioxide, or nitrogen test of not less than which pressure and time?
A.3 psi for 10 minutes
B.10 psi for not less than 15 minutes with no perceptible drop
C.60 psi for 30 minutes
D.Working pressure only, held for 5 minutes
Explanation: UPC 1213.3 requires an air, CO2, or nitrogen test of not less than 10 psi, held for a time acceptable to the Authority Having Jurisdiction but in no case less than 15 minutes with no perceptible drop. That is the standard low-pressure fuel-gas test on the open-book C-1D. The 60 psi / 30 minute test is reserved for welded piping or systems carrying gas above 14 inches water column.
2Per 2018 UPC Section 1213.3, welded fuel-gas piping, or piping that will carry gas at pressures in excess of 14 inches water column, shall be tested at not less than which of the following?
A.10 psi for 15 minutes
B.15 psi for 15 minutes
C.25 psi for 10 minutes
D.60 psi for not less than 30 minutes
Explanation: The same section that sets 10 psi / 15 minutes for ordinary low-pressure systems raises the bar for welded pipe and for systems above 14 inches water column to not less than 60 psi held not less than 30 minutes. PSI Nevada C-1D candidates should open Chapter 12 and read both sentences of 1213.3 rather than applying the residential 10 psi test to every job.
3Where a sediment trap is not built into a gas appliance, the 2018 UPC requires the sediment trap to be installed in which location?
A.Upstream of the appliance shutoff valve, as close to the meter as practical
B.Downstream of the appliance shutoff valve, as close to the appliance inlet as practical
C.In the street-side service riser below the meter
D.Only on propane systems; natural-gas appliances do not need sediment traps
Explanation: UPC 1212.9 (NFPA 54) requires a sediment trap (drip tee) downstream of the appliance shutoff valve and as close to the inlet of the appliance as practical, unless the appliance already incorporates one. The nipple-and-cap drip collects scale and moisture before they enter the controls. Illuminating appliances, ranges, clothes dryers, and outdoor grills are among the listed exceptions.
4Per the 2018 UPC, each gas appliance shall have a shutoff valve located in the same room as the appliance and within what maximum distance of the appliance?
A.3 feet
B.6 feet
C.10 feet
D.25 feet, if the valve is readily accessible
Explanation: UPC 1212.5 requires an appliance shutoff valve in the same room and within 6 feet of the appliance, with listed exceptions for vented decorative appliances and certain outdoor equipment. The 6 foot rule is a standard open-book lookup on contractor fuel-gas items. A valve at the meter does not replace the appliance shutoff.
5Per 2018 UPC Section 1211.2, CSST gas piping shall be bonded to the electrical service grounding electrode system with a copper bonding jumper not smaller than which size?
A.10 AWG copper
B.8 AWG copper
C.6 AWG copper
D.4 AWG aluminum only
Explanation: UPC 1211.2 requires CSST systems, and systems containing one or more CSST segments, to be bonded to the electrical service grounding electrode system. The bonding jumper shall be not smaller than 6 AWG copper. The jumper connects to a metallic pipe or fitting between the point of delivery and the first downstream CSST fitting. Arc-resistant (black-jacket) CSST has additional manufacturer and listing rules, but the 6 AWG bond remains the Chapter 12 baseline.
6Per the 2018 UPC, underground fuel-gas piping shall have a minimum cover of 12 inches, increased to 18 inches where external damage is likely. If 12 inches of cover cannot be provided, which installation is acceptable?
A.Leave the pipe at 6 inches of cover if it is polyethylene
B.Install the pipe in a conduit or bridge (shield) it
C.Wrap steel pipe with duct tape and bury at 8 inches
D.Reduce cover to 6 inches if a tracer wire is provided
Explanation: UPC 1210.1.6 requires 12 inches of cover, or 18 inches where external damage is likely (driveways, parking). Where 12 inches cannot be provided, the pipe must be installed in conduit or bridged (shielded). Tracer wire is required for nonmetallic pipe but does not buy a reduction in cover. C-1D scope includes gas piping from the building edge to the utility meter, so burial depth is a contractor item.
7A listed gas appliance connector used under the 2018 UPC shall not exceed what maximum length?
A.3 feet
B.6 feet
C.10 feet
D.There is no length limit if the connector is listed
Explanation: UPC 1212.3 limits listed flexible appliance connectors to 6 feet. The connector is not a substitute for the piping system and is not to be concealed in walls, floors, or partitions except where the listing specifically allows a specific product. Measure connector length, do not coil extra hose behind the range or water heater.
8Polyethylene (PE) fuel-gas piping under the 2018 UPC is limited to which application, and what locating method is required?
A.Indoor exposed piping only, with no tracer
B.Underground outdoor use, with an electrically continuous corrosion-resistant tracer wire or tape
C.Concealed indoor wall cavities if sleeved
D.Appliance connectors inside the mechanical room
Explanation: UPC Chapter 12 permits PE gas pipe underground outdoors (and in some outdoor aboveground riser transitions with listed anodeless risers). An electrically continuous corrosion-resistant tracer wire or tape must be buried with nonmetallic pipe so it can be located after backfill. PE is not an indoor distribution material and is not an appliance connector.
9A CSST bonding jumper under 2018 UPC 1211.2 shall connect to metallic gas piping or a fitting in which location?
A.On the utility side of the meter, ahead of the point of delivery
B.Between the point of delivery and the first downstream CSST fitting
C.Only at the last appliance shutoff valve on the system
D.To the nearest cold-water pipe, which then serves as the electrode
Explanation: The bonding jumper must land on a metallic pipe or fitting between the point of delivery (typically the downstream meter outlet / customer piping) and the first CSST fitting. That bonds the entire CSST run to the electrical service grounding electrode system. Bonding on the utility side of the meter, only at a remote appliance valve, or using the water pipe as a substitute electrode does not satisfy 1211.2.
10Using the 2018 UPC longest-length method, a branch takeoff 25 feet from the meter on a system whose most remote appliance is 90 feet from the meter is sized from which table column?
A.The 25-foot column, because that is the branch length
B.The 50-foot column, averaging the two lengths
C.The 90-foot column, because the entire system is sized from the longest run
D.The 10-foot column, because the branch is short
Explanation: Chapter 12 pipe-sizing tables are entered with the longest length of piping from the point of delivery to the most remote appliance. Every section of that system, including short branches, is read from that longest-run column. Using the actual branch length under-sizes the pipe relative to the table's pressure-drop assumption. A 40,000 Btu/h water heater is about 40 cubic feet per hour of natural gas (divide input by 1,000); look that load up in the 90-foot column, not the 25-foot column.

About the NV C-1D Plumbing Exam

The Nevada C-1D Plumbing Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 80 scored questions. Passing is 70% (56 of 80 points) in 3 hours. The examination is open book. Approved center references include 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 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. PSI also offers this examination in Spanish; this bank is an English-language MCQ study adaptation, not an official translation. 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

3 hours

Passing Score

70% (56 of 80 points)

Exam Fee

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

NV C-1D Plumbing Exam Content Outline

10%

Gas Systems

Gas piping (8 items)

5%

Cleanouts

Cleanouts (4 items)

4%

Fixtures and Equipment

Fixtures and equipment (3 items)

4%

Hydronics

Hydronic heating not exceeding 200,000 BTU (3 items)

8%

Water Heaters/Venting

Water heaters and venting (6 items)

6%

Piping, Valves, and Controls

Piping, valves, and controls (5 items)

10%

Water Supply

Water supply (8 items)

5%

Hangers and Supports

Hangers and supports (4 items)

10%

Drain, Waste, and Vents

DWV systems (8 items)

5%

Backflow

Backflow prevention (4 items)

5%

Traps and Interceptors

Traps and interceptors (4 items)

8%

Isometric Analysis/Plumbing Mathematics

Isometrics and plumbing math (6 items)

6%

Safety

Safety (5 items)

4%

Joints and Connections

Joints and connections (3 items)

4%

Solar

Solar water heating (3 items)

4%

General Plumbing Requirements

General plumbing requirements (3 items)

4%

Storm Drainage

Storm drainage (3 items)

How to Pass the NV C-1D Plumbing Exam

What You Need to Know

  • Passing score: 70% (56 of 80 points)
  • Assessment: Open Book computer-based multiple-choice. Uniform Plumbing Code, 2018 (allowed in center)
  • Time limit: 3 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-1D Plumbing 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-1D Plumbing Contractor Examination?

The official PSI examination has 80 scored questions. Passing is 70% (56 of 80 points) within 3 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-1D Plumbing 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-1D Plumbing 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.