Arizona (AZ) CR37, C37 Plumbing Practice Exam LATEST
QUESTIONS AND CORRECT ANSWERS
1. What is the primary plumbing code adopted by the State of Arizona?
A) International Plumbing Code (IPC)
B) Uniform Plumbing Code (UPC)
C) National Standard Plumbing Code (NSPC)
D) Arizona State Plumbing Code (ASPC)
ANSWER: B
EXPLANATION: Arizona has historically adopted and amended the Uniform Plumbing Code (UPC),
published by the International Association of Plumbing and Mechanical Officials (IAPMO). The exact
edition (e.g., 2018, 2021) is specified in state regulations.
2. Which state agency is primarily responsible for administering and enforcing plumbing laws and rules
in Arizona?
A) Arizona Department of Environmental Quality (ADEQ)
B) Arizona Department of Health Services (ADHS)
C) Arizona Registrar of Contractors (ROC)
D) Arizona State Board of Technical Registration
ANSWER: C
EXPLANATION: The Arizona Registrar of Contractors (ROC) licenses plumbing contractors and
journeymen, and enforces the statutes and rules related to plumbing work. ADEQ and ADHS have roles
in water quality and backflow, but ROC is the primary licensing and enforcement authority for plumbing.
3. What is the minimum passing score for the Arizona plumbing contractor (C-37) or journeyman (CR-37)
licensing exam?
A) 60%
B) 70%
C) 75%
,D) 80%
ANSWER: B
EXPLANATION: According to the Arizona Registrar of Contractors, the minimum passing score for
plumbing exams is 70%. Always verify with the most current ROC bulletins.
4. A plumbing "journeyman" in Arizona is allowed to:
A) Pull permits and contract directly with owners
B) Supervise plumbing work only under the direction of a licensed plumbing contractor
C) Design plumbing systems for commercial buildings
D) Work without any supervision
ANSWER: B
EXPLANATION: A journeyman (CR-37) can perform plumbing work but must be employed by and under
the supervision of a licensed C-37 plumbing contractor, who holds the license to contract and pull
permits.
5. Who is legally allowed to pull a plumbing permit in Arizona?
A) The property owner for their own residence
B) A licensed plumbing contractor (C-37)
C) A journeyman plumber (CR-37)
D) Any licensed general contractor
ANSWER: B
EXPLANATION: Only the licensed plumbing contractor of record, or sometimes the property owner for
their own primary residence (owner-builder), can pull a plumbing permit. A journeyman cannot pull
permits.
6. What is the primary purpose of a plumbing "trap" on a fixture drain?
A) To slow the flow of waste
B) To maintain a water seal that prevents sewer gases from entering the building
C) To catch debris and prevent clogs
D) To provide access for cleaning
,ANSWER: B
EXPLANATION: The trap seal (typically 2 inches of water) is the critical barrier between the sanitary
drainage system and the occupied space. It prevents odors and potentially dangerous gases from
migrating into the building.
7. The minimum required size for a building sewer serving a single-family dwelling is:
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
ANSWER: C
EXPLANATION: Per UPC Table 7-5-2, a building sewer serving one single-family dwelling unit must be at
least 4 inches in diameter. Local amendments may vary, but 4 inches is the UPC standard.
8. What is the minimum required slope (fall per foot) for a 4-inch diameter building sewer?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
ANSWER: B
EXPLANATION: UPC Table 7-5-1 specifies drainage pipe slopes. For a 4-inch pipe, the minimum slope is
1/4 inch per foot (2% grade). This ensures adequate scouring velocity to carry solids.
9. The "cleanout" on a drainage line must be installed:
A) Only at the base of each stack
B) At every change of direction greater than 45 degrees
C) At the beginning of every horizontal drain and at intervals not exceeding 100 feet
D) All of the above
ANSWER: D
, EXPLANATION: UPC Section 708 requires cleanouts to provide access for clearing blockages. Key
locations include: at the base of each stack, at every change of direction greater than 45°, at the building
drain/sewer junction, and at intervals not exceeding 100 feet in horizontal lines.
10. The maximum distance from the trap weir to the vent for a 1-1/4 inch trap is:
A) 2 feet 6 inches
B) 3 feet 6 inches
C) 5 feet
D) 6 feet
ANSWER: B
EXPLANATION: UPC Table 9-3 provides the maximum trap-to-vent distances. For a 1-1/4" trap (typical
for a lavatory), the maximum distance is 3 feet 6 inches. This prevents siphonage of the trap seal.
11. The maximum distance from the trap weir to the vent for a 2-inch trap (like a shower) is:
A) 5 feet
B) 6 feet
C) 8 feet
D) 10 feet
ANSWER: C
EXPLANATION: Per UPC Table 9-3, a 2-inch trap can be up to 8 feet from its vent. Larger diameter traps
can withstand a longer developed length before the seal is compromised.
12. What is the minimum size for a vent stack serving a building drain with 100 drainage fixture units
(DFU)?
A) 1-1/2 inches
B) 2 inches
C) 3 inches
D) 4 inches
ANSWER: C
QUESTIONS AND CORRECT ANSWERS
1. What is the primary plumbing code adopted by the State of Arizona?
A) International Plumbing Code (IPC)
B) Uniform Plumbing Code (UPC)
C) National Standard Plumbing Code (NSPC)
D) Arizona State Plumbing Code (ASPC)
ANSWER: B
EXPLANATION: Arizona has historically adopted and amended the Uniform Plumbing Code (UPC),
published by the International Association of Plumbing and Mechanical Officials (IAPMO). The exact
edition (e.g., 2018, 2021) is specified in state regulations.
2. Which state agency is primarily responsible for administering and enforcing plumbing laws and rules
in Arizona?
A) Arizona Department of Environmental Quality (ADEQ)
B) Arizona Department of Health Services (ADHS)
C) Arizona Registrar of Contractors (ROC)
D) Arizona State Board of Technical Registration
ANSWER: C
EXPLANATION: The Arizona Registrar of Contractors (ROC) licenses plumbing contractors and
journeymen, and enforces the statutes and rules related to plumbing work. ADEQ and ADHS have roles
in water quality and backflow, but ROC is the primary licensing and enforcement authority for plumbing.
3. What is the minimum passing score for the Arizona plumbing contractor (C-37) or journeyman (CR-37)
licensing exam?
A) 60%
B) 70%
C) 75%
,D) 80%
ANSWER: B
EXPLANATION: According to the Arizona Registrar of Contractors, the minimum passing score for
plumbing exams is 70%. Always verify with the most current ROC bulletins.
4. A plumbing "journeyman" in Arizona is allowed to:
A) Pull permits and contract directly with owners
B) Supervise plumbing work only under the direction of a licensed plumbing contractor
C) Design plumbing systems for commercial buildings
D) Work without any supervision
ANSWER: B
EXPLANATION: A journeyman (CR-37) can perform plumbing work but must be employed by and under
the supervision of a licensed C-37 plumbing contractor, who holds the license to contract and pull
permits.
5. Who is legally allowed to pull a plumbing permit in Arizona?
A) The property owner for their own residence
B) A licensed plumbing contractor (C-37)
C) A journeyman plumber (CR-37)
D) Any licensed general contractor
ANSWER: B
EXPLANATION: Only the licensed plumbing contractor of record, or sometimes the property owner for
their own primary residence (owner-builder), can pull a plumbing permit. A journeyman cannot pull
permits.
6. What is the primary purpose of a plumbing "trap" on a fixture drain?
A) To slow the flow of waste
B) To maintain a water seal that prevents sewer gases from entering the building
C) To catch debris and prevent clogs
D) To provide access for cleaning
,ANSWER: B
EXPLANATION: The trap seal (typically 2 inches of water) is the critical barrier between the sanitary
drainage system and the occupied space. It prevents odors and potentially dangerous gases from
migrating into the building.
7. The minimum required size for a building sewer serving a single-family dwelling is:
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
ANSWER: C
EXPLANATION: Per UPC Table 7-5-2, a building sewer serving one single-family dwelling unit must be at
least 4 inches in diameter. Local amendments may vary, but 4 inches is the UPC standard.
8. What is the minimum required slope (fall per foot) for a 4-inch diameter building sewer?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
ANSWER: B
EXPLANATION: UPC Table 7-5-1 specifies drainage pipe slopes. For a 4-inch pipe, the minimum slope is
1/4 inch per foot (2% grade). This ensures adequate scouring velocity to carry solids.
9. The "cleanout" on a drainage line must be installed:
A) Only at the base of each stack
B) At every change of direction greater than 45 degrees
C) At the beginning of every horizontal drain and at intervals not exceeding 100 feet
D) All of the above
ANSWER: D
, EXPLANATION: UPC Section 708 requires cleanouts to provide access for clearing blockages. Key
locations include: at the base of each stack, at every change of direction greater than 45°, at the building
drain/sewer junction, and at intervals not exceeding 100 feet in horizontal lines.
10. The maximum distance from the trap weir to the vent for a 1-1/4 inch trap is:
A) 2 feet 6 inches
B) 3 feet 6 inches
C) 5 feet
D) 6 feet
ANSWER: B
EXPLANATION: UPC Table 9-3 provides the maximum trap-to-vent distances. For a 1-1/4" trap (typical
for a lavatory), the maximum distance is 3 feet 6 inches. This prevents siphonage of the trap seal.
11. The maximum distance from the trap weir to the vent for a 2-inch trap (like a shower) is:
A) 5 feet
B) 6 feet
C) 8 feet
D) 10 feet
ANSWER: C
EXPLANATION: Per UPC Table 9-3, a 2-inch trap can be up to 8 feet from its vent. Larger diameter traps
can withstand a longer developed length before the seal is compromised.
12. What is the minimum size for a vent stack serving a building drain with 100 drainage fixture units
(DFU)?
A) 1-1/2 inches
B) 2 inches
C) 3 inches
D) 4 inches
ANSWER: C
