ALABAMA JOURNEYMAN PLUMBER EXAMINATION
VERSION 2026-2027 WITH COMPLETE DETAILED 100
QUESTIONS AND 100% CORRECT VERIFIED
ANSWERS WITH RATIONALES PLUS ANSWER KEY
ALREADY A+ GRADED INSTANT DOWNLOAD PDF
Q1. According to Alabama Code § 34-37-6(e)(1), what is the minimum experience
requirement for an applicant to qualify for the Journeyman Plumber examination?
A) One year as an apprentice plumber
B) Two years of work experience as an apprentice plumber or completion of an
approved apprentice training program
C) Three years as an apprentice plumber
D) Five years of work experience as a journeyman plumber
Correct Answer: B) Two years of work experience as an apprentice plumber or
completion of an approved apprentice training program
Rationale: Alabama Code § 34-37-6(e)(1) requires applicants for the journeyman
plumber examination to submit proof of two years of work experience as an
apprentice plumber or completion of an approved apprentice training program
approved by the board.
Q2. What is the primary purpose of a plumbing trap in a drainage system?
A) Increase water pressure
,B) Prevent sewer gases from entering the building
C) Speed up drainage
D) Reduce water usage
Correct Answer: B) Prevent sewer gases from entering the building
Rationale: Plumbing traps hold water to create a water seal that prevents sewer
gases and odors from migrating back into occupied spaces.
Q3. What is the minimum slope required for a horizontal drainage pipe with a
diameter of 3 inches according to the IPC?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
Correct Answer: B) 1/4 inch per foot
Rationale: The IPC specifies a minimum slope of 1/4 inch per foot for horizontal
drainage pipes 3 inches or smaller to maintain scouring velocity and proper
drainage.
Q4. What is the minimum size required for a building sewer in a residential
application?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
Correct Answer: C) 4 inches
Rationale: According to plumbing codes, the minimum size for a residential
building sewer is 4 inches to ensure adequate waste removal and flow.
Q5. What does the abbreviation "DWV" stand for in plumbing systems?
A) Down Water Valve
B) Drainage, Waste, and Vent
C) Dry Water Valve
D) Drainage Water Volume
,Correct Answer: B) Drainage, Waste, and Vent
Rationale: "DWV" stands for Drainage, Waste, and Vent, describing the system of
pipes designed to carry wastewater away and vent sewer gases.
Q6. What is the minimum trap seal depth required by most plumbing codes?
A) 1/2 inch
B) 2 inches
C) 3 inches
D) 4 inches
Correct Answer: B) 2 inches
Rationale: The minimum trap seal depth required by code is typically 2 inches to
maintain an adequate water barrier against sewer gases and prevent trap seal
loss.
Q7. What is the maximum allowable distance between a trap and its vent for a 2-
inch drainage pipe?
A) 2 feet
B) 4 feet
C) 6 feet
D) 8 feet
Correct Answer: C) 6 feet
Rationale: The code limits the maximum distance between a trap and its vent to
prevent siphoning. For a 2-inch pipe, the maximum distance is 6 feet.
Q8. Which fitting is used to change the direction of flow by 90 degrees in a
plumbing system?
A) Tee
B) Coupling
C) Elbow
D) Union
Correct Answer: C) Elbow
Rationale: An elbow fitting is specifically designed to change the direction of
piping by 90 degrees.
, Q9. Which material is commonly used for drain, waste, and vent (DWV) piping in
residential plumbing systems?
A) Copper
B) Cast iron
C) PVC
D) Galvanized steel
Correct Answer: C) PVC
Rationale: PVC is widely used for DWV systems due to its corrosion resistance, ease
of installation, and cost-effectiveness.
Q10. According to the Alabama Plumbing Code, what is the minimum water
pressure required at a fixture tap?
A) 20 psi
B) 30 psi
C) 40 psi
D) 50 psi
Correct Answer: C) 40 psi
Rationale: The Alabama Plumbing Code specifies a minimum of 40 psi at any
fixture to ensure adequate flow for normal use.
Q11. What is the primary function of a vent in a plumbing system?
A) Increase water pressure
B) Remove wastewater
C) Equalize air pressure and prevent trap siphonage
D) Filter water
Correct Answer: C) Equalize air pressure and prevent trap siphonage
Rationale: Vents equalize air pressure in the drainage system, preventing
siphonage or backpressure that could break trap seals.
Q12. Which device is required to protect a potable water system from backflow at
a high-hazard cross-connection?
A) Air gap
B) Double check valve assembly (DCVA)
VERSION 2026-2027 WITH COMPLETE DETAILED 100
QUESTIONS AND 100% CORRECT VERIFIED
ANSWERS WITH RATIONALES PLUS ANSWER KEY
ALREADY A+ GRADED INSTANT DOWNLOAD PDF
Q1. According to Alabama Code § 34-37-6(e)(1), what is the minimum experience
requirement for an applicant to qualify for the Journeyman Plumber examination?
A) One year as an apprentice plumber
B) Two years of work experience as an apprentice plumber or completion of an
approved apprentice training program
C) Three years as an apprentice plumber
D) Five years of work experience as a journeyman plumber
Correct Answer: B) Two years of work experience as an apprentice plumber or
completion of an approved apprentice training program
Rationale: Alabama Code § 34-37-6(e)(1) requires applicants for the journeyman
plumber examination to submit proof of two years of work experience as an
apprentice plumber or completion of an approved apprentice training program
approved by the board.
Q2. What is the primary purpose of a plumbing trap in a drainage system?
A) Increase water pressure
,B) Prevent sewer gases from entering the building
C) Speed up drainage
D) Reduce water usage
Correct Answer: B) Prevent sewer gases from entering the building
Rationale: Plumbing traps hold water to create a water seal that prevents sewer
gases and odors from migrating back into occupied spaces.
Q3. What is the minimum slope required for a horizontal drainage pipe with a
diameter of 3 inches according to the IPC?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
Correct Answer: B) 1/4 inch per foot
Rationale: The IPC specifies a minimum slope of 1/4 inch per foot for horizontal
drainage pipes 3 inches or smaller to maintain scouring velocity and proper
drainage.
Q4. What is the minimum size required for a building sewer in a residential
application?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
Correct Answer: C) 4 inches
Rationale: According to plumbing codes, the minimum size for a residential
building sewer is 4 inches to ensure adequate waste removal and flow.
Q5. What does the abbreviation "DWV" stand for in plumbing systems?
A) Down Water Valve
B) Drainage, Waste, and Vent
C) Dry Water Valve
D) Drainage Water Volume
,Correct Answer: B) Drainage, Waste, and Vent
Rationale: "DWV" stands for Drainage, Waste, and Vent, describing the system of
pipes designed to carry wastewater away and vent sewer gases.
Q6. What is the minimum trap seal depth required by most plumbing codes?
A) 1/2 inch
B) 2 inches
C) 3 inches
D) 4 inches
Correct Answer: B) 2 inches
Rationale: The minimum trap seal depth required by code is typically 2 inches to
maintain an adequate water barrier against sewer gases and prevent trap seal
loss.
Q7. What is the maximum allowable distance between a trap and its vent for a 2-
inch drainage pipe?
A) 2 feet
B) 4 feet
C) 6 feet
D) 8 feet
Correct Answer: C) 6 feet
Rationale: The code limits the maximum distance between a trap and its vent to
prevent siphoning. For a 2-inch pipe, the maximum distance is 6 feet.
Q8. Which fitting is used to change the direction of flow by 90 degrees in a
plumbing system?
A) Tee
B) Coupling
C) Elbow
D) Union
Correct Answer: C) Elbow
Rationale: An elbow fitting is specifically designed to change the direction of
piping by 90 degrees.
, Q9. Which material is commonly used for drain, waste, and vent (DWV) piping in
residential plumbing systems?
A) Copper
B) Cast iron
C) PVC
D) Galvanized steel
Correct Answer: C) PVC
Rationale: PVC is widely used for DWV systems due to its corrosion resistance, ease
of installation, and cost-effectiveness.
Q10. According to the Alabama Plumbing Code, what is the minimum water
pressure required at a fixture tap?
A) 20 psi
B) 30 psi
C) 40 psi
D) 50 psi
Correct Answer: C) 40 psi
Rationale: The Alabama Plumbing Code specifies a minimum of 40 psi at any
fixture to ensure adequate flow for normal use.
Q11. What is the primary function of a vent in a plumbing system?
A) Increase water pressure
B) Remove wastewater
C) Equalize air pressure and prevent trap siphonage
D) Filter water
Correct Answer: C) Equalize air pressure and prevent trap siphonage
Rationale: Vents equalize air pressure in the drainage system, preventing
siphonage or backpressure that could break trap seals.
Q12. Which device is required to protect a potable water system from backflow at
a high-hazard cross-connection?
A) Air gap
B) Double check valve assembly (DCVA)
