New Jersey Master Plumber Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. Which code governs plumbing installations in New Jersey?
A. International Plumbing Code (IPC)
B. Uniform Plumbing Code (UPC)
C. New Jersey State Plumbing Subcode
D. National Standard Plumbing Code
Correct Answer: C
The New Jersey State Plumbing Subcode, based on the IPC with state
amendments, is the legally adopted standard.
2. A master plumber in New Jersey is responsible for which of the
following?
A. Only residential plumbing work
B. Supervising journeymen and apprentices
C. Gas piping only
D. Design work only
Correct Answer: B
A master plumber is legally responsible for supervising plumbing work
and personnel.
3. What is the minimum size of a building sewer serving a one-family
dwelling?
, A. 3 inches
B. 4 inches
C. 5 inches
D. 6 inches
Correct Answer: B
The minimum building sewer size for a single-family dwelling is 4 inches.
4. Which material is prohibited for potable water distribution?
A. Copper
B. CPVC
C. Galvanized steel
D. ABS
Correct Answer: D
ABS is not approved for potable water distribution systems.
5. What fitting must be used to change direction horizontally in a
drainage system?
A. Sanitary tee
B. Long-turn wye
C. Vent tee
D. Pressure elbow
Correct Answer: B
Long-turn fittings are required to maintain flow characteristics in
drainage systems.
6. What is the maximum trap arm length for a 2-inch pipe under
standard conditions?
A. 3 feet
B. 5 feet
, C. 8 feet
D. 10 feet
Correct Answer: C
Trap arm length is limited to prevent siphonage and maintain trap seals.
7. Which valve is required at the water service entrance?
A. Check valve
B. Gate valve
C. Full-open shutoff valve
D. Relief valve
Correct Answer: C
A full-open shutoff valve allows complete control of the water supply.
8. What is the minimum slope for a 3-inch horizontal drainage pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. No slope required
Correct Answer: B
Pipes 3 inches and smaller require a minimum slope of 1/4 inch per foot.
9. What device protects a water heater from excessive pressure?
A. Check valve
B. Expansion tank
C. Pressure relief valve
D. Vacuum breaker
Correct Answer: C
A pressure relief valve prevents dangerous overpressure conditions.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which code governs plumbing installations in New Jersey?
A. International Plumbing Code (IPC)
B. Uniform Plumbing Code (UPC)
C. New Jersey State Plumbing Subcode
D. National Standard Plumbing Code
Correct Answer: C
The New Jersey State Plumbing Subcode, based on the IPC with state
amendments, is the legally adopted standard.
2. A master plumber in New Jersey is responsible for which of the
following?
A. Only residential plumbing work
B. Supervising journeymen and apprentices
C. Gas piping only
D. Design work only
Correct Answer: B
A master plumber is legally responsible for supervising plumbing work
and personnel.
3. What is the minimum size of a building sewer serving a one-family
dwelling?
, A. 3 inches
B. 4 inches
C. 5 inches
D. 6 inches
Correct Answer: B
The minimum building sewer size for a single-family dwelling is 4 inches.
4. Which material is prohibited for potable water distribution?
A. Copper
B. CPVC
C. Galvanized steel
D. ABS
Correct Answer: D
ABS is not approved for potable water distribution systems.
5. What fitting must be used to change direction horizontally in a
drainage system?
A. Sanitary tee
B. Long-turn wye
C. Vent tee
D. Pressure elbow
Correct Answer: B
Long-turn fittings are required to maintain flow characteristics in
drainage systems.
6. What is the maximum trap arm length for a 2-inch pipe under
standard conditions?
A. 3 feet
B. 5 feet
, C. 8 feet
D. 10 feet
Correct Answer: C
Trap arm length is limited to prevent siphonage and maintain trap seals.
7. Which valve is required at the water service entrance?
A. Check valve
B. Gate valve
C. Full-open shutoff valve
D. Relief valve
Correct Answer: C
A full-open shutoff valve allows complete control of the water supply.
8. What is the minimum slope for a 3-inch horizontal drainage pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. No slope required
Correct Answer: B
Pipes 3 inches and smaller require a minimum slope of 1/4 inch per foot.
9. What device protects a water heater from excessive pressure?
A. Check valve
B. Expansion tank
C. Pressure relief valve
D. Vacuum breaker
Correct Answer: C
A pressure relief valve prevents dangerous overpressure conditions.
