Arizona CR37, C37 Plumbing Practice Exam LATEST
QUESTIONS AND CORRECT ANSWERS
1. According to the Arizona Plumbing Code, what is the minimum required slope for a 4-inch diameter
horizontal drainage pipe?
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: IPC Table 704.1 requires 1/4 inch per foot slope for 4-inch drainage piping.
2. In Arizona, what is the maximum allowable length for a 1-1/2 inch diameter trap arm?
A) 3 feet 6 inches
B) 5 feet
C) 6 feet
D) 8 feet
ANSWER: A
Explanation: IPC 1002.4 allows maximum trap arm length of 3 feet 6 inches for 1-1/2 inch pipe.
3. What is the minimum required size for a building drain serving a single-family residence in Arizona?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
,ANSWER: C
Explanation: IPC Table 710.1(1) requires minimum 4-inch building drain for residential.
4. According to Arizona regulations, what is the minimum working pressure rating for copper water
tubing used in residential systems?
A) 100 psi
B) 150 psi
C) 200 psi
D) 250 psi
ANSWER: C
Explanation: Most codes require minimum 200 psi working pressure for copper water tubing.
5. What is the minimum required clearance in front of a water heater in Arizona?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
ANSWER: C
Explanation: IPC 504.6 requires minimum 24-inch front clearance for service access.
6. How many plumbing fixture units (dfu) does a water closet with a 1.6 gpf flushometer valve count as
in drainage calculations?
A) 2 dfu
B) 4 dfu
C) 6 dfu
D) 8 dfu
,ANSWER: B
Explanation: IPC Table 709.2 assigns 4 dfu to flushometer water closets.
7. What is the minimum required water supply pipe size for a residential bathroom group (WC, lav,
tub/shower)?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
ANSWER: B
Explanation: Based on fixture unit count, 3/4 inch supply is typically required.
8. According to Arizona code, what is the maximum spacing for pipe hangers supporting 2-inch copper
water pipe?
A) 6 feet
B) 8 feet
C) 10 feet
D) 12 feet
ANSWER: C
Explanation: IPC 305.4 requires maximum 10-foot spacing for 2-inch copper pipe.
9. What is the minimum required vent size for a 3-inch soil stack serving water closets?
A) 1-1/2 inches
B) 2 inches
C) 3 inches
D) 4 inches
, ANSWER: C
Explanation: IPC 906.1 requires vent diameter not less than half the drain diameter served.
10. In Arizona, what is the minimum required trap size for a kitchen sink?
A) 1-1/4 inches
B) 1-1/2 inches
C) 2 inches
D) 2-1/2 inches
ANSWER: B
Explanation: IPC 1002.1 requires minimum 1-1/2 inch trap for kitchen sinks.
11. What is the maximum allowable horizontal distance from a trap to its vent for a 2-inch drain?
A) 5 feet
B) 6 feet
C) 8 feet
D) 10 feet
ANSWER: B
Explanation: IPC Table 906.2 allows 6 feet for 2-inch drains.
12. According to Arizona code, what is the minimum required size for a gas pipe serving a 100,000 BTU
water heater?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
ANSWER: B
QUESTIONS AND CORRECT ANSWERS
1. According to the Arizona Plumbing Code, what is the minimum required slope for a 4-inch diameter
horizontal drainage pipe?
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: IPC Table 704.1 requires 1/4 inch per foot slope for 4-inch drainage piping.
2. In Arizona, what is the maximum allowable length for a 1-1/2 inch diameter trap arm?
A) 3 feet 6 inches
B) 5 feet
C) 6 feet
D) 8 feet
ANSWER: A
Explanation: IPC 1002.4 allows maximum trap arm length of 3 feet 6 inches for 1-1/2 inch pipe.
3. What is the minimum required size for a building drain serving a single-family residence in Arizona?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
,ANSWER: C
Explanation: IPC Table 710.1(1) requires minimum 4-inch building drain for residential.
4. According to Arizona regulations, what is the minimum working pressure rating for copper water
tubing used in residential systems?
A) 100 psi
B) 150 psi
C) 200 psi
D) 250 psi
ANSWER: C
Explanation: Most codes require minimum 200 psi working pressure for copper water tubing.
5. What is the minimum required clearance in front of a water heater in Arizona?
A) 12 inches
B) 18 inches
C) 24 inches
D) 36 inches
ANSWER: C
Explanation: IPC 504.6 requires minimum 24-inch front clearance for service access.
6. How many plumbing fixture units (dfu) does a water closet with a 1.6 gpf flushometer valve count as
in drainage calculations?
A) 2 dfu
B) 4 dfu
C) 6 dfu
D) 8 dfu
,ANSWER: B
Explanation: IPC Table 709.2 assigns 4 dfu to flushometer water closets.
7. What is the minimum required water supply pipe size for a residential bathroom group (WC, lav,
tub/shower)?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
ANSWER: B
Explanation: Based on fixture unit count, 3/4 inch supply is typically required.
8. According to Arizona code, what is the maximum spacing for pipe hangers supporting 2-inch copper
water pipe?
A) 6 feet
B) 8 feet
C) 10 feet
D) 12 feet
ANSWER: C
Explanation: IPC 305.4 requires maximum 10-foot spacing for 2-inch copper pipe.
9. What is the minimum required vent size for a 3-inch soil stack serving water closets?
A) 1-1/2 inches
B) 2 inches
C) 3 inches
D) 4 inches
, ANSWER: C
Explanation: IPC 906.1 requires vent diameter not less than half the drain diameter served.
10. In Arizona, what is the minimum required trap size for a kitchen sink?
A) 1-1/4 inches
B) 1-1/2 inches
C) 2 inches
D) 2-1/2 inches
ANSWER: B
Explanation: IPC 1002.1 requires minimum 1-1/2 inch trap for kitchen sinks.
11. What is the maximum allowable horizontal distance from a trap to its vent for a 2-inch drain?
A) 5 feet
B) 6 feet
C) 8 feet
D) 10 feet
ANSWER: B
Explanation: IPC Table 906.2 allows 6 feet for 2-inch drains.
12. According to Arizona code, what is the minimum required size for a gas pipe serving a 100,000 BTU
water heater?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
ANSWER: B
