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100+ Free NV C-1 Plumbing and Heating Practice Questions

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2026 Statistics

Key Facts: NV C-1 Plumbing and Heating Exam

120 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

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-1 Plumbing and Heating Contractor Examination is the official NSCB/PSI open book exam: 120 questions, 70% (84 of 120 points), 5 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-1 Plumbing and Heating Practice Questions

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

1A steam heating boiler is being placed in service. Which safety control is required to shut off the fuel if the water level in the boiler drops below a safe point?
A.A high-limit aquastat only
B.A listed low-water fuel cutoff
C.A circulating-pump flow switch only
D.A flue-gas carbon-monoxide sensor
Explanation: A listed low-water fuel cutoff is the boiler safety that interrupts the burner when the water line falls below the manufacturer’s safe level. Without that cutoff, a steam or hot-water boiler can overheat and fail. An aquastat, pump flow switch, or CO sensor does not replace the low-water cutoff required on heating boilers.
2The pressure relief valve on a hot-water heating boiler must be which of the following?
A.A hose-bibb vacuum breaker piped to a floor sink
B.An ASME-rated relief valve set at or below the boiler’s maximum allowable working pressure
C.A temperature-only relief valve set at 140°F
D.A check valve in the boiler feed line
Explanation: Heating boilers require an ASME-rated pressure relief valve set at or below the boiler’s maximum allowable working pressure (MAWP) so the vessel cannot be pressurized beyond its listing. The discharge must be full size, unobstructed, and piped to a safe location. A vacuum breaker, temperature-only valve, or feed-line check valve does not provide that overpressure protection.
3On a steam heating boiler, a Hartford loop is installed in the return piping primarily to do which of the following?
A.Increase the boiler’s steaming rate by raising the water line
B.Prevent the boiler water from being siphoned out through the return if a return line fails
C.Replace the need for a low-water fuel cutoff
D.Convert the steam boiler to a closed hot-water heating system
Explanation: A Hartford loop ties the wet return into the equalizer near the boiler water line so a break or leak in the return cannot siphon the boiler dry. It is a steam-piping arrangement, not a substitute for the low-water fuel cutoff and not a conversion to hydronic hot water. The loop keeps enough water in the boiler for safe firing if the return is lost.
4Per UPC 2018 Section 1211.8 and NFPA 54 (2012), where a sediment trap is required at a gas appliance, it shall be installed in which location?
A.Upstream of the appliance shutoff valve, as far from the appliance as possible
B.Downstream of the appliance shutoff valve and as close to the appliance inlet as practical
C.In the meter manifold only, with no trap at the appliance
D.In the vent connector above the draft hood
Explanation: UPC 1211.8 / NFPA 54 9.6.7 require a sediment trap downstream of the appliance shutoff valve and as close to the appliance inlet as practical when the appliance does not already incorporate one. The trap is a tee with a capped nipple in the bottom outlet so scale and debris drop out before the gas control. A trap at the meter or in the vent does not protect the appliance valve.
5Per UPC 2018 Section 1211.5 and NFPA 54 (2012), an appliance manual gas shutoff valve shall be located not more than how far from the appliance it serves?
A.3 feet
B.6 feet
C.10 feet
D.25 feet
Explanation: UPC 1211.5 / NFPA 54 require an accessible manual shutoff with a nondisplaceable member, or a listed gas convenience outlet, within 6 feet of the appliance. Where a connector is used, the valve is installed upstream of the connector. Three feet is a common flexible-connector length, not the shutoff-valve distance.
6Per UPC 2018 fuel-gas testing rules, a low-pressure (not more than 14 inches water column) welded-free gas piping system shall be tested at not less than which pressure and duration?
A.3 psi held for 5 minutes
B.10 psi held for not less than 15 minutes with no perceptible drop
C.50 psi held for 60 minutes
D.Working pressure only, with no timed hold
Explanation: UPC gas-piping tests for ordinary low-pressure systems require an air, CO2, or nitrogen test of not less than 10 psi held at least 15 minutes with no perceptible drop. Welded piping and systems operating above 14 inches water column are tested at not less than 60 psi for at least 30 minutes. A 3 psi / 5-minute test does not meet the UPC minimum.
7Per UPC 2018 Section 1211.8, which gas appliance is not required to have a sediment trap if one is not built into the appliance?
A.A gas furnace
B.A gas water heater
C.A domestic gas range
D.A gas boiler
Explanation: UPC 1211.8 / NFPA 54 exempt illuminating appliances, ranges, clothes dryers, decorative appliances for vented fireplaces, gas fireplaces, and outdoor grills from the sediment-trap requirement. Furnaces, water heaters, and boilers are not on that exemption list and need a tee-type sediment trap at the appliance inlet unless the appliance already includes one.
8Per UPC 2018 Section 1210.1.1 / NFPA 54 (2012), underground fuel-gas piping shall have a cover of not less than which depth, unless the pipe is in conduit or bridged where that cover cannot be provided?
A.6 inches
B.12 inches
C.36 inches
D.48 inches
Explanation: UPC 1210.1.1 / NFPA 54 require not less than 12 inches of cover over underground gas piping. Where external damage from outside forces is likely, the cover is increased (commonly to 18 inches). Where 12 inches cannot be provided, the pipe must be installed in conduit or bridged (shielded). Six inches is the UPC yard-water-pipe cover figure, not the gas-pipe cover.
9When sizing a low-pressure natural-gas piping system by the UPC / NFPA 54 longest-length method, which length is entered in the sizing table for every pipe section?
A.The length of that individual section only, ignoring fittings
B.The developed length from the meter or regulator to the most remote appliance outlet
C.The sum of all branch lengths in the building
D.One-half the measured length to allow for diversity
Explanation: The longest-length method uses the developed length from the meter or point-of-delivery regulator to the most remote appliance for every section in the system. Each section is then sized from the table for the load it actually carries at that common length. Using only the short local section length under-sizes upstream pipe; summing every branch or cutting the length in half is not the method.
10Per NFPA 58 (2014) two-stage LP-gas regulation for a building, where is the first-stage regulator normally installed and what does it do?
A.At each appliance, reducing 11 inches water column to 3.5 inches water column
B.At the container, reducing tank pressure to an intermediate pressure (commonly about 10 psi) before the second-stage regulator at the building
C.At the meter bar, converting natural gas to propane pressure
D.In the vent connector, controlling draft, not gas pressure
Explanation: NFPA 58 two-stage systems place the first-stage regulator at the ASME tank or cylinder manifold, cutting high container pressure down to an intermediate pressure (typically about 10 psi). A second-stage regulator at the building then reduces that intermediate pressure to the appliance utilization pressure, about 11 inches water column for LP-gas. First-stage regulation is not done at each appliance and has nothing to do with the vent connector.

About the NV C-1 Plumbing and Heating Exam

The Nevada C-1 Plumbing and Heating Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 120 scored questions. Passing is 70% (84 of 120 points) in 5 hours. The examination is open book. Approved center references include UPC 2018, UMC 2018, NFPA 54 (2012), 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 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. UPC 2018, UMC 2018, NFPA 54 (2012), NFPA 58 (2014) (allowed in center)

Time Limit

5 hours

Passing Score

70% (84 of 120 points)

Exam Fee

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

NV C-1 Plumbing and Heating Exam Content Outline

3%

Boilers

Boilers (4 items)

7%

Gas Systems

Gas systems (8 items)

3%

Cleanouts

Cleanouts (4 items)

3%

Fixtures and Equipment

Fixtures and equipment (4 items)

2%

Hydronics

Hydronics (3 items)

5%

Water Heaters/Venting

Water heaters and venting (6 items)

2%

Piping, Valves, and Controls

Piping, valves, and controls (3 items)

2%

Sheet Metal

Sheet metal (3 items)

7%

Water Supply

Water supply (8 items)

4%

Hangers and Supports

Hangers and supports (5 items)

8%

Drain, Waste, and Vents

DWV systems (10 items)

3%

Backflow

Backflow prevention (4 items)

7%

Traps and Interceptors

Traps and interceptors (8 items)

7%

Isometric Analysis/Plumbing Mathematics

Isometrics and plumbing math (8 items)

4%

Safety

Safety (5 items)

3%

Joints and Connections

Joints and connections (4 items)

3%

Solar

Solar water heating (4 items)

6%

General Plumbing Requirements

General plumbing requirements (7 items)

4%

Fire Sprinklers

Fire sprinklers (5 items)

4%

Storm Drainage

Storm drainage (5 items)

2%

Industrial Piping

Industrial piping (3 items)

2%

Breathing Systems for Firefighters

Firefighter breathing-air systems (3 items)

5%

Chilled Water Piping

Chilled-water piping (6 items)

How to Pass the NV C-1 Plumbing and Heating Exam

What You Need to Know

  • Passing score: 70% (84 of 120 points)
  • Assessment: Open Book computer-based multiple-choice. UPC 2018, UMC 2018, NFPA 54 (2012), NFPA 58 (2014) (allowed in center)
  • Time limit: 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-1 Plumbing and 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-1 Plumbing and Heating Contractor Examination?

The official PSI examination has 120 scored questions. Passing is 70% (84 of 120 points) within 5 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-1 Plumbing and Heating 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-1 Plumbing and Heating exam open book?

Yes. PSI lists this examination as open book. UPC 2018, UMC 2018, NFPA 54 (2012), 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.