ARIZONA PLUMBING
LICENSE PRACTICE EXAM
COMPLETE
Question 1: A plumber is sizing a sanitary drainage system. What is the main
purpose of using drainage �xture units rather than only pipe diameter?
Choices:
1) To convert �xture load into a standardized sizing method 2) To identify the brand of �xture being installed 3) To eliminate the need for trap primers 4) To determine only the water heater capacity Correct Answer: To convert �xture load into a standardized sizing method Explanation: Drainage �xture units provide a standardized way to express expected drainage load so pipe sizes and branches can be selected consistently.Page 1
Question 2: In a drainage system, what condition is a properly installed vent
primarily intended to prevent?
Choices:
1) Mineral scale in hot water piping 2) Loss of trap seal from siphonage or backpressure 3) Excessive gas pressure at an appliance regulator 4) Corrosion of steel sprinkler hangers
Correct Answer: Loss of trap seal from siphonage or backpressure
Explanation: Vent piping protects traps by admitting air and relieving pressure so trap seals are not pulled or forced out.Question 3: Which �tting is generally appropriate for changing direction from vertical to horizontal in a drainage stack at its base?
Choices:
1) Straight coupling only 2) Short water-supply elbow 3) Long sweep �tting 4) Compression stop valve
Correct Answer: Long sweep �tting
Explanation: A long sweep �tting provides a smoother �ow path where vertical drainage changes to horizontal drainage.Page 2
Question 4: A horizontal drainage pipe is installed with inadequate slope. What is the most likely result?
Choices:
1) Trap seals will become deeper 2) Fixture �ow rates will increase inde�nitely 3) The pipe will automatically self-vent 4) Solids may settle and cause stoppages
Correct Answer: Solids may settle and cause stoppages
Explanation: Drainage pipe relies on proper slope to keep liquid and solids moving together; too little slope promotes deposits and blockages.
Question 5: Which statement best describes a building drain?
Choices:
1) It receives discharge from soil, waste, and other drainage pipes inside the building and conveys it to the building sewer 2) It is the public main located in the street 3) It is only the vent pipe above the roof 4) It is only a cleanout �tting at the property line Correct Answer: It receives discharge from soil, waste, and other drainage pipes inside the building and conveys it to the building sewer Explanation: The building drain is the portion of the drainage system that collects internal discharge and carries it toward the building sewer.Page 3