AZ C-37 (CR-37) Plumbing Contractor Practice
Exam – Questions & Answers
Here is a comprehensive set of 200 practice questions for the Arizona C-
37 (CR-37) Plumbing Contractor Exam. The actual exam consists of 100
multiple-choice questions with a 4-hour time limit and a passing score
of 70%. The exam is open-book and covers the International Plumbing
Code (IPC), Arizona Administrative Code Title 4, Arizona Revised
Statutes Title 32, and other applicable standards.
C-37 (Commercial) Scope: Installation, alteration, and repair of all
plumbing performed solely within property lines, including water supply,
drainage, gas piping, fire protection systems, and sewage treatment
systems.
CR-37 (Dual) Scope: Allows the scopes of work permitted by both the
commercial C-37 and residential R-37R Plumbing licenses.
Section 1: Plumbing Fundamentals & Definitions
Question 1
What is the primary purpose of a trap in a plumbing fixture?
A. To filter debris from wastewater
B. To prevent sewer gases from entering the building
C. To regulate water flow
D. To reduce water consumption
*Correct Answer: B. *
Rationale: A trap maintains a water seal that blocks sewer gases from
entering the building, ensuring a sanitary, odor-free interior.
,Question 2
Which type of trap is most commonly used under a lavatory sink?
A. S-trap
B. P-trap
C. Drum trap
D. Bell trap
*Correct Answer: B. *
Rationale: P-traps are standard under sinks because they reliably maintain a
water seal, are easy to clean and maintain, and comply with modern
plumbing code requirements.
Question 3
What is the primary purpose of a plumbing vent system?
A. To increase water pressure
B. To remove wastewater
C. To allow air into the drainage system and prevent trap siphonage
D. To filter wastewater
*Correct Answer: C. *
Rationale: Vent systems equalize air pressure within drainage piping,
preventing traps from being siphoned dry and allowing wastewater to flow
efficiently. Without proper venting, sewer gases could enter occupied spaces.
Question 4
Which pipe material is commonly used for residential water distribution
systems?
A. Clay pipe
B. Copper tubing
,C. Concrete pipe
D. Cast iron soil pipe only
*Correct Answer: B. *
Rationale: Copper tubing is durable, corrosion-resistant, and widely accepted
by plumbing codes for potable water distribution systems in residential
buildings.
Question 5
Which of the following best describes the purpose of the Arizona CR-37
Plumbing Contractor's license?
A. To perform architectural design of plumbing systems
B. To install, repair, and maintain plumbing systems in compliance
with state law
C. To inspect structural integrity of buildings
D. To certify electrical installations
*Correct Answer: B. *
Rationale: The CR-37 license is specifically focused on plumbing installation
and maintenance in compliance with state law.
Question 6
Which International Plumbing Code (IPC) chapter primarily governs the
design of sanitary drainage systems?
A. Chapter 3 – General Regulations
B. Chapter 5 – Drainage, Waste, and Vents
C. Chapter 7 – Water Supply and Distribution
D. Chapter 9 – Fixtures, Faucets, and Fixture Fittings
, *Correct Answer: B. *
Rationale: Chapter 5 of the IPC contains the requirements for sanitary
drainage, waste, and venting systems.
Question 7
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
*Correct Answer: C. *
Rationale: The Arizona Registrar of Contractors (ROC) licenses plumbing
contractors and journeymen and enforces the statutes and rules related to
plumbing work.
Question 8
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
*Correct Answer: B. *
Rationale: 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.
Exam – Questions & Answers
Here is a comprehensive set of 200 practice questions for the Arizona C-
37 (CR-37) Plumbing Contractor Exam. The actual exam consists of 100
multiple-choice questions with a 4-hour time limit and a passing score
of 70%. The exam is open-book and covers the International Plumbing
Code (IPC), Arizona Administrative Code Title 4, Arizona Revised
Statutes Title 32, and other applicable standards.
C-37 (Commercial) Scope: Installation, alteration, and repair of all
plumbing performed solely within property lines, including water supply,
drainage, gas piping, fire protection systems, and sewage treatment
systems.
CR-37 (Dual) Scope: Allows the scopes of work permitted by both the
commercial C-37 and residential R-37R Plumbing licenses.
Section 1: Plumbing Fundamentals & Definitions
Question 1
What is the primary purpose of a trap in a plumbing fixture?
A. To filter debris from wastewater
B. To prevent sewer gases from entering the building
C. To regulate water flow
D. To reduce water consumption
*Correct Answer: B. *
Rationale: A trap maintains a water seal that blocks sewer gases from
entering the building, ensuring a sanitary, odor-free interior.
,Question 2
Which type of trap is most commonly used under a lavatory sink?
A. S-trap
B. P-trap
C. Drum trap
D. Bell trap
*Correct Answer: B. *
Rationale: P-traps are standard under sinks because they reliably maintain a
water seal, are easy to clean and maintain, and comply with modern
plumbing code requirements.
Question 3
What is the primary purpose of a plumbing vent system?
A. To increase water pressure
B. To remove wastewater
C. To allow air into the drainage system and prevent trap siphonage
D. To filter wastewater
*Correct Answer: C. *
Rationale: Vent systems equalize air pressure within drainage piping,
preventing traps from being siphoned dry and allowing wastewater to flow
efficiently. Without proper venting, sewer gases could enter occupied spaces.
Question 4
Which pipe material is commonly used for residential water distribution
systems?
A. Clay pipe
B. Copper tubing
,C. Concrete pipe
D. Cast iron soil pipe only
*Correct Answer: B. *
Rationale: Copper tubing is durable, corrosion-resistant, and widely accepted
by plumbing codes for potable water distribution systems in residential
buildings.
Question 5
Which of the following best describes the purpose of the Arizona CR-37
Plumbing Contractor's license?
A. To perform architectural design of plumbing systems
B. To install, repair, and maintain plumbing systems in compliance
with state law
C. To inspect structural integrity of buildings
D. To certify electrical installations
*Correct Answer: B. *
Rationale: The CR-37 license is specifically focused on plumbing installation
and maintenance in compliance with state law.
Question 6
Which International Plumbing Code (IPC) chapter primarily governs the
design of sanitary drainage systems?
A. Chapter 3 – General Regulations
B. Chapter 5 – Drainage, Waste, and Vents
C. Chapter 7 – Water Supply and Distribution
D. Chapter 9 – Fixtures, Faucets, and Fixture Fittings
, *Correct Answer: B. *
Rationale: Chapter 5 of the IPC contains the requirements for sanitary
drainage, waste, and venting systems.
Question 7
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
*Correct Answer: C. *
Rationale: The Arizona Registrar of Contractors (ROC) licenses plumbing
contractors and journeymen and enforces the statutes and rules related to
plumbing work.
Question 8
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
*Correct Answer: B. *
Rationale: 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.
