AZ C-37 (CR-37) Plumbing Contractor
Practice Exam – Questions & Answers 2026-
2027
Question 1
When reading a plumbing isometric drawing, the symbol "⎈" most
commonly represents which component?
A. Cleanout
B. Sanitary tee
C. Air admittance valve (AAV)
D. Wye fitting
*Correct Answer: C. *
Rationale: The "⎈" symbol in most plumbing isometrics denotes an air
admittance valve, used where venting to the outdoors is impractical.
Question 2
According to the IPC, what is the required sizing method for a grease
interceptor in a 10-seat restaurant?
A. 1 gallon per seat per minute of flow
B. 2 gallons per seat per minute of flow
C. 3 gallons per seat per minute of flow
D. 4 gallons per seat per minute of flow
*Correct Answer: B. *
Rationale: The IPC prescribes a minimum of 2 gallons per seat per minute of
flow for grease interceptors in food-service establishments.
,Question 3
What is the minimum slope required for a 3-inch horizontal drainage pipe
serving a single building in Arizona?
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
*Correct Answer: B. *
Rationale: The minimum slope required by code for a 3-inch horizontal
drainage pipe is 1/8 inch per foot to ensure adequate flow and prevent
blockages.
Question 4
Which material is NOT approved for underground drainage piping in
commercial buildings in Arizona?
A. Cast iron
B. Copper DWV
C. ABS plastic
D. Galvanized steel
*Correct Answer: D. *
Rationale: Galvanized steel is not approved for underground drainage
because it corrodes rapidly when buried; cast iron, copper DWV, and ABS are
acceptable.
,Question 5
What size pipe is required to feed a fire hydrant on private property?
A. 4 inch
B. 6 inch
C. 8 inch
D. 10 inch
*Correct Answer: B. *
Rationale: A 6-inch pipe is used to feed a fire hydrant on private property.
Question 6
What is the maximum distance from the end for the last support hanger on
a 1-inch fire sprinkler branch line?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
*Correct Answer: B. *
Rationale: The last support hanger on a fire sprinkler branch for 1-inch
nominal pipe may be no more than 36 inches from the end.
Question 7
Which type of pipe joint connection is NOT permitted in gas line piping?
A. Threaded
B. Flared
, C. Soldered
D. Compression
*Correct Answer: D. *
Rationale: Compression fittings are not permitted in gas line piping.
Question 8
What type of valve shall be installed at each building water supply line?
A. Ball valve
B. Full open gate valve
C. Check valve
D. Pressure-reducing valve
*Correct Answer: B. *
Rationale: A full-open gate valve is required at each building water supply
line.
Question 9
According to OSHA, ladders (or steps) are required in all trenches or ditches
at what depth or more for an adequate means of exit?
A. 2 feet
B. 4 feet
C. 5 feet
D. 6 feet
*Correct Answer: B. *
Practice Exam – Questions & Answers 2026-
2027
Question 1
When reading a plumbing isometric drawing, the symbol "⎈" most
commonly represents which component?
A. Cleanout
B. Sanitary tee
C. Air admittance valve (AAV)
D. Wye fitting
*Correct Answer: C. *
Rationale: The "⎈" symbol in most plumbing isometrics denotes an air
admittance valve, used where venting to the outdoors is impractical.
Question 2
According to the IPC, what is the required sizing method for a grease
interceptor in a 10-seat restaurant?
A. 1 gallon per seat per minute of flow
B. 2 gallons per seat per minute of flow
C. 3 gallons per seat per minute of flow
D. 4 gallons per seat per minute of flow
*Correct Answer: B. *
Rationale: The IPC prescribes a minimum of 2 gallons per seat per minute of
flow for grease interceptors in food-service establishments.
,Question 3
What is the minimum slope required for a 3-inch horizontal drainage pipe
serving a single building in Arizona?
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
*Correct Answer: B. *
Rationale: The minimum slope required by code for a 3-inch horizontal
drainage pipe is 1/8 inch per foot to ensure adequate flow and prevent
blockages.
Question 4
Which material is NOT approved for underground drainage piping in
commercial buildings in Arizona?
A. Cast iron
B. Copper DWV
C. ABS plastic
D. Galvanized steel
*Correct Answer: D. *
Rationale: Galvanized steel is not approved for underground drainage
because it corrodes rapidly when buried; cast iron, copper DWV, and ABS are
acceptable.
,Question 5
What size pipe is required to feed a fire hydrant on private property?
A. 4 inch
B. 6 inch
C. 8 inch
D. 10 inch
*Correct Answer: B. *
Rationale: A 6-inch pipe is used to feed a fire hydrant on private property.
Question 6
What is the maximum distance from the end for the last support hanger on
a 1-inch fire sprinkler branch line?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
*Correct Answer: B. *
Rationale: The last support hanger on a fire sprinkler branch for 1-inch
nominal pipe may be no more than 36 inches from the end.
Question 7
Which type of pipe joint connection is NOT permitted in gas line piping?
A. Threaded
B. Flared
, C. Soldered
D. Compression
*Correct Answer: D. *
Rationale: Compression fittings are not permitted in gas line piping.
Question 8
What type of valve shall be installed at each building water supply line?
A. Ball valve
B. Full open gate valve
C. Check valve
D. Pressure-reducing valve
*Correct Answer: B. *
Rationale: A full-open gate valve is required at each building water supply
line.
Question 9
According to OSHA, ladders (or steps) are required in all trenches or ditches
at what depth or more for an adequate means of exit?
A. 2 feet
B. 4 feet
C. 5 feet
D. 6 feet
*Correct Answer: B. *
