100+ Free NH Journeyman Plumber Practice Questions

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Under the IPC 2018 adopted by New Hampshire, what is the minimum slope required for a 4-inch horizontal drainage pipe?

1/16 inch per foot

1/8 inch per foot

1/4 inch per foot

1/2 inch per foot

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Key Facts: NH Journeyman Plumber Exam

70%

Passing Score

NH Mechanical Safety Board

Questions

Prometric exam

$270+

Total Cost

$190 exam + $80-100 license

IPC 2018

Code Edition

NH adoption

The NH journeyman plumber exam has 85 questions in 3 hours requiring 70% to pass. NH uses the IPC 2018 and the exam is administered by Prometric. The exam fee is $190 plus $80-100 for the license. The master exam is separate with 100 questions requiring 75%.

Sample NH Journeyman Plumber Practice Questions

Try these sample questions to test your NH Journeyman Plumber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the IPC 2018 adopted by New Hampshire, what is the minimum slope required for a 4-inch horizontal drainage pipe?

A.1/16 inch per foot

B.1/8 inch per foot

C.1/4 inch per foot

D.1/2 inch per foot

Explanation: Under the IPC 2018, horizontal drainage pipes 3 inches and larger require a minimum slope of 1/8 inch per foot. Pipes 2-1/2 inches and smaller require 1/4 inch per foot. New Hampshire's Mechanical Safety & Licensing Board enforces IPC 2018 standards.

2New Hampshire's journeyman plumber exam is administered by which testing organization?

A.PSI

B.Prometric

C.Pearson VUE

D.GITS

Explanation: New Hampshire's journeyman plumber exam is administered by Prometric on behalf of the Mechanical Safety & Licensing Board. The journeyman exam has 85 questions with a 3-hour time limit requiring 70% to pass.

3Under the IPC 2018, what is the DFU value for a standard water closet (1.6 GPF)?

A.2 DFU

B.3 DFU

C.4 DFU

D.6 DFU

Explanation: Under the IPC 2018, a standard water closet with a 1.6 GPF flush valve is rated at 3 DFU. Note that IPC DFU values differ from UPC values. NH plumbers must use IPC 2018 DFU tables.

4Under the IPC 2018, what is the minimum building sewer size when water closets are connected?

A.2 inches

B.3 inches

C.4 inches

D.6 inches

Explanation: Under the IPC 2018, the minimum building sewer size is 4 inches when water closets discharge into the system. The 3-inch minimum applies only when no water closets are connected. NH follows IPC building sewer sizing.

5Under the IPC 2018, what is the minimum vent pipe size?

A.1 inch

B.1-1/4 inches

C.1-1/2 inches

D.2 inches

Explanation: Under the IPC 2018, no vent pipe shall be less than 1-1/4 inches in diameter. This minimum applies to individual, branch, and circuit vents. NH plumbers must follow IPC vent sizing requirements.

6Under the IPC 2018, what is the maximum static water pressure in a building distribution system?

A.60 psi

B.80 psi

C.100 psi

D.120 psi

Explanation: Under the IPC 2018, maximum static water pressure must not exceed 80 psi. When pressure exceeds 80 psi, a pressure-reducing valve is required. NH plumbers must verify and regulate water pressure.

7Under the IPC 2018, what type of backflow prevention is required for a high-hazard cross-connection?

A.Atmospheric vacuum breaker

B.Dual check valve

C.Reduced pressure zone (RPZ) assembly

D.Hose bibb vacuum breaker

Explanation: The IPC 2018 requires an RPZ backflow prevention assembly for high-hazard cross-connections. This provides the highest level of mechanical backflow protection. NH plumbers must select appropriate backflow devices based on hazard level.

8Under the IPC 2018, what is the minimum trap seal depth?

A.1 inch

B.2 inches

C.3 inches

D.4 inches

Explanation: Under the IPC 2018, the minimum trap seal depth is 2 inches and the maximum is 4 inches. The trap seal prevents sewer gases from entering the building. In NH's cold climate, maintaining trap seals is critical.

9Under the IPC 2018, what is the minimum trap size for a residential lavatory?

A.1 inch

B.1-1/4 inches

C.1-1/2 inches

D.2 inches

Explanation: Under the IPC 2018, the minimum trap size for a residential lavatory is 1-1/4 inches. The trap must match the fixture drain outlet. NH follows IPC trap sizing requirements.

10Under the IPC 2018, what material is NOT approved for underground drainage?

A.Cast iron

B.PVC DWV

C.ABS DWV

D.Galvanized steel

Explanation: Galvanized steel is not approved for underground drainage under the IPC due to corrosion. Cast iron, PVC, and ABS are approved. NH plumbers must use IPC-approved materials for underground installations.

About the NH Journeyman Plumber Exam

New Hampshire's journeyman plumber exam is administered by Prometric on behalf of the Mechanical Safety & Licensing Board. The exam has 85 questions with a 3-hour time limit and requires 70% to pass. NH uses the IPC 2018 edition. The master plumber exam is separate with 100 questions and requires 75%.

Questions

85 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

$190 + $80-100 license (NH Mechanical Safety & Licensing Board (Prometric))

NH Journeyman Plumber Exam Content Outline

25%

Drainage, Waste & Vent Systems

IPC 2018 drainage pipe sizing, DFU calculations, slope requirements, cleanouts, and trap arm distances

20%

Venting Systems

Vent sizing, wet venting, AAVs, vent termination, circuit venting per IPC 2018

20%

Water Supply & Backflow Prevention

Water pipe sizing, WSFU calculations, backflow prevention, pressure regulation, and cross-connection control

15%

Gas Piping & Venting

Gas pipe sizing, BTUH calculations, pressure testing, combustion air, and appliance venting

20%

Fixtures, Materials & Code Administration

Fixture installation, clearances, materials, permits, inspections, and NH-specific requirements

How to Pass the NH Journeyman Plumber Exam

What You Need to Know

Passing score: 70%
Exam length: 85 questions
Time limit: 3 hours
Exam fee: $190 + $80-100 license

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NH Journeyman Plumber Study Tips from Top Performers

1Study the IPC 2018 edition specifically — NH has not adopted newer editions

2Master IPC drainage and vent sizing tables for pipe sizing questions

3Learn DFU values for common fixtures and understand trap arm distance limits

4Review backflow prevention device selection for different hazard levels

5Study gas pipe sizing and BTUH calculations for fuel gas questions

6Consider NH cold-climate requirements for frost protection and vent terminal heights

Frequently Asked Questions

What plumbing code does New Hampshire use?

New Hampshire uses the International Plumbing Code (IPC) 2018 edition. The exam tests IPC knowledge including drainage, venting, water supply, gas piping, and fixture installation requirements.

What is the difference between NH journeyman and master plumber exams?

The journeyman exam has 85 questions requiring 70% to pass. The master exam has 100 questions requiring 75% to pass. Both have 3-hour time limits and are administered by Prometric.

How much does the NH plumber exam cost?

The exam fee is approximately $190 paid to Prometric, plus $80-100 for the license fee to the NH Mechanical Safety & Licensing Board.

Does NH have cold-climate plumbing requirements?

Yes, New Hampshire's cold winters require frost protection for underground piping, proper vent terminal heights above snow lines, and consideration of freeze protection for water supply systems.