AZ C-37 (CR-37) PLUMBING CONTRACTOR
EXAMINATION COMPLETE QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
Exam Coverage
1. Arizona Plumbing Codes and Regulations
o Arizona statutes, contractor licensing requirements, adopted plumbing codes, permits,
inspections, and legal responsibilities.
2. Water Supply Systems
o Water service piping, sizing, pressure regulation, valves, materials, backflow prevention,
and distribution systems.
3. Drain, Waste, and Vent (DWV) Systems
o Proper installation, sizing, slopes, cleanouts, traps, vents, and drainage principles.
4. Fixtures and Appliances
o Installation requirements for plumbing fixtures, water heaters, commercial equipment,
accessibility, and fixture clearances.
5. Gas Piping Systems
o Fuel gas materials, sizing, pressure testing, regulators, combustion air, and appliance
connections.
6. Water Heating Equipment
o Conventional, tankless, indirect, and commercial water heaters, expansion tanks, T&P
relief valves, and installation requirements.
7. Pipe Materials and Installation
o Copper, PEX, CPVC, PVC, ABS, cast iron, steel piping, joining methods, supports, and
corrosion protection.
8. Safety and OSHA Requirements
o Excavation safety, PPE, confined spaces, ladders, trench protection, lockout/tagout, and
hazard communication.
9. Blueprint Reading and Plumbing Calculations
o Reading construction drawings, pipe sizing, fixture units, elevations, pressure loss, and
estimating materials.
10. Business Practices and Jobsite Management
Contracts, scheduling, supervision, inspections, quality control, customer relations, and project
documentation.
,Question 1
Before beginning plumbing work requiring a permit on a commercial construction
project in Arizona, which responsibility should a licensed plumbing contractor
complete first to remain compliant with applicable regulations?
A. Begin rough-in installation before contacting the building department
B. Obtain the required permit before starting regulated plumbing work
C. Wait until final inspection before filing permit paperwork
D. Allow the property owner to decide whether permits are necessary
Answer: B
Rationale: Arizona regulations generally require permits before regulated
plumbing work begins. Performing work without required permits may result in
penalties, failed inspections, or required removal of completed work.
Question 2
When sizing a building water distribution system serving multiple plumbing
fixtures simultaneously, what primary design factor ensures adequate water
delivery under expected peak demand conditions?
A. Pipe color
B. Fixture unit calculations
C. Pipe manufacturer
D. Pipe age
Answer: B
,Rationale: Fixture unit calculations estimate probable simultaneous demand and
are the accepted method for sizing water distribution piping.
Question 3
Why is maintaining the proper slope on a horizontal sanitary drainage pipe
especially important for long-term plumbing system performance and reliability?
A. It improves pipe appearance
B. It allows efficient drainage while preventing solids from accumulating inside
piping
C. It reduces insulation requirements
D. It increases water pressure
Answer: B
Rationale: Proper drainage slope keeps liquids moving while carrying solids
effectively, reducing clogs and maintaining sanitary system performance.
Question 4
Which plumbing device primarily protects a potable water supply from
contamination caused by backflow resulting from backsiphonage or backpressure
conditions?
A. Pressure gauge
B. Vacuum breaker or approved backflow prevention assembly
C. Ball valve
, D. Cleanout fitting
Answer: B
Rationale: Backflow prevention devices stop contaminated water from reversing
into potable water systems.
Question 5
During installation of a storage-type water heater, why must a temperature and
pressure relief valve be installed according to code requirements?
A. To improve heating efficiency
B. To relieve excessive pressure and temperature before dangerous conditions
develop
C. To reduce electrical consumption
D. To increase water pressure
Answer: B
Rationale: T&P valves protect against excessive pressure and overheating,
reducing explosion hazards.
Question 6
Which pipe material is generally unsuitable for carrying hot water continuously
because excessive temperatures may damage the piping material?
A. Copper
EXAMINATION COMPLETE QUESTIONS AND
DETAILED SOLUTIONS LATEST UPDATE THIS YEAR
JUST RELEASED
Exam Coverage
1. Arizona Plumbing Codes and Regulations
o Arizona statutes, contractor licensing requirements, adopted plumbing codes, permits,
inspections, and legal responsibilities.
2. Water Supply Systems
o Water service piping, sizing, pressure regulation, valves, materials, backflow prevention,
and distribution systems.
3. Drain, Waste, and Vent (DWV) Systems
o Proper installation, sizing, slopes, cleanouts, traps, vents, and drainage principles.
4. Fixtures and Appliances
o Installation requirements for plumbing fixtures, water heaters, commercial equipment,
accessibility, and fixture clearances.
5. Gas Piping Systems
o Fuel gas materials, sizing, pressure testing, regulators, combustion air, and appliance
connections.
6. Water Heating Equipment
o Conventional, tankless, indirect, and commercial water heaters, expansion tanks, T&P
relief valves, and installation requirements.
7. Pipe Materials and Installation
o Copper, PEX, CPVC, PVC, ABS, cast iron, steel piping, joining methods, supports, and
corrosion protection.
8. Safety and OSHA Requirements
o Excavation safety, PPE, confined spaces, ladders, trench protection, lockout/tagout, and
hazard communication.
9. Blueprint Reading and Plumbing Calculations
o Reading construction drawings, pipe sizing, fixture units, elevations, pressure loss, and
estimating materials.
10. Business Practices and Jobsite Management
Contracts, scheduling, supervision, inspections, quality control, customer relations, and project
documentation.
,Question 1
Before beginning plumbing work requiring a permit on a commercial construction
project in Arizona, which responsibility should a licensed plumbing contractor
complete first to remain compliant with applicable regulations?
A. Begin rough-in installation before contacting the building department
B. Obtain the required permit before starting regulated plumbing work
C. Wait until final inspection before filing permit paperwork
D. Allow the property owner to decide whether permits are necessary
Answer: B
Rationale: Arizona regulations generally require permits before regulated
plumbing work begins. Performing work without required permits may result in
penalties, failed inspections, or required removal of completed work.
Question 2
When sizing a building water distribution system serving multiple plumbing
fixtures simultaneously, what primary design factor ensures adequate water
delivery under expected peak demand conditions?
A. Pipe color
B. Fixture unit calculations
C. Pipe manufacturer
D. Pipe age
Answer: B
,Rationale: Fixture unit calculations estimate probable simultaneous demand and
are the accepted method for sizing water distribution piping.
Question 3
Why is maintaining the proper slope on a horizontal sanitary drainage pipe
especially important for long-term plumbing system performance and reliability?
A. It improves pipe appearance
B. It allows efficient drainage while preventing solids from accumulating inside
piping
C. It reduces insulation requirements
D. It increases water pressure
Answer: B
Rationale: Proper drainage slope keeps liquids moving while carrying solids
effectively, reducing clogs and maintaining sanitary system performance.
Question 4
Which plumbing device primarily protects a potable water supply from
contamination caused by backflow resulting from backsiphonage or backpressure
conditions?
A. Pressure gauge
B. Vacuum breaker or approved backflow prevention assembly
C. Ball valve
, D. Cleanout fitting
Answer: B
Rationale: Backflow prevention devices stop contaminated water from reversing
into potable water systems.
Question 5
During installation of a storage-type water heater, why must a temperature and
pressure relief valve be installed according to code requirements?
A. To improve heating efficiency
B. To relieve excessive pressure and temperature before dangerous conditions
develop
C. To reduce electrical consumption
D. To increase water pressure
Answer: B
Rationale: T&P valves protect against excessive pressure and overheating,
reducing explosion hazards.
Question 6
Which pipe material is generally unsuitable for carrying hot water continuously
because excessive temperatures may damage the piping material?
A. Copper
