ALABAMA JOURNEYMAN PLUMBER EXAM | COMPLETE
EXAM WITH ACTUAL QUESTIONS WITH CORRECT
VERIFIED ANSWERS WITH RATIONALES
1. The primary purpose of a plumbing trap is to:
A. Increase water pressure
B. Prevent sewer gases from entering the building
C. Improve drainage speed
D. Filter solid waste
Correct Answer: B
Rationale: A trap maintains a water seal that blocks sewer gases
from entering occupied spaces.
2. The minimum slope for a 3-inch horizontal drainage pipe is
typically:
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
Correct Answer: B
Rationale: Pipes 3 inches or larger require at least 1/8 inch per
foot slope for proper flow.
,3. A vent stack primarily functions to:
A. Increase water supply pressure
B. Remove wastewater
C. Equalize air pressure in drainage system
D. Filter debris
Correct Answer: C
Rationale: Venting prevents siphoning of trap seals and maintains
proper drainage pressure.
4. Cross-connection in plumbing refers to:
A. Two drains meeting at a fitting
B. Connection between potable and non-potable water
C. Pipe branching
D. Dual supply lines
Correct Answer: B
Rationale: Cross-connections risk contamination of drinking
water.
5. The standard test for drainage system leaks is:
A. Pressure test
B. Dye test
C. Water or air test
D. Flow test
Correct Answer: C
,Rationale: Codes require water or air testing for system integrity.
6. The minimum trap seal depth is typically:
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
Correct Answer: B
Rationale: A 2-inch minimum seal prevents gas passage.
7. A cleanout is required to:
A. Increase water velocity
B. Provide access for pipe maintenance
C. Regulate pressure
D. Prevent corrosion
Correct Answer: B
Rationale: Cleanouts allow removal of obstructions.
8. Which material is commonly approved for potable water
distribution?
, A. Cast iron
B. PVC Schedule 40
C. Copper
D. ABS
Correct Answer: C
Rationale: Copper is widely approved for potable supply lines.
9. Backflow prevention devices are installed to:
A. Increase pressure
B. Prevent reverse water flow
C. Reduce pipe size
D. Filter solids
Correct Answer: B
Rationale: They protect potable water from contamination.
10. The function of a P-trap is to:
A. Speed drainage
B. Provide venting
C. Maintain water seal barrier
D. Reduce pipe diameter
Correct Answer: C
EXAM WITH ACTUAL QUESTIONS WITH CORRECT
VERIFIED ANSWERS WITH RATIONALES
1. The primary purpose of a plumbing trap is to:
A. Increase water pressure
B. Prevent sewer gases from entering the building
C. Improve drainage speed
D. Filter solid waste
Correct Answer: B
Rationale: A trap maintains a water seal that blocks sewer gases
from entering occupied spaces.
2. The minimum slope for a 3-inch horizontal drainage pipe is
typically:
A. 1/16 inch per foot
B. 1/8 inch per foot
C. 1/4 inch per foot
D. 1/2 inch per foot
Correct Answer: B
Rationale: Pipes 3 inches or larger require at least 1/8 inch per
foot slope for proper flow.
,3. A vent stack primarily functions to:
A. Increase water supply pressure
B. Remove wastewater
C. Equalize air pressure in drainage system
D. Filter debris
Correct Answer: C
Rationale: Venting prevents siphoning of trap seals and maintains
proper drainage pressure.
4. Cross-connection in plumbing refers to:
A. Two drains meeting at a fitting
B. Connection between potable and non-potable water
C. Pipe branching
D. Dual supply lines
Correct Answer: B
Rationale: Cross-connections risk contamination of drinking
water.
5. The standard test for drainage system leaks is:
A. Pressure test
B. Dye test
C. Water or air test
D. Flow test
Correct Answer: C
,Rationale: Codes require water or air testing for system integrity.
6. The minimum trap seal depth is typically:
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
Correct Answer: B
Rationale: A 2-inch minimum seal prevents gas passage.
7. A cleanout is required to:
A. Increase water velocity
B. Provide access for pipe maintenance
C. Regulate pressure
D. Prevent corrosion
Correct Answer: B
Rationale: Cleanouts allow removal of obstructions.
8. Which material is commonly approved for potable water
distribution?
, A. Cast iron
B. PVC Schedule 40
C. Copper
D. ABS
Correct Answer: C
Rationale: Copper is widely approved for potable supply lines.
9. Backflow prevention devices are installed to:
A. Increase pressure
B. Prevent reverse water flow
C. Reduce pipe size
D. Filter solids
Correct Answer: B
Rationale: They protect potable water from contamination.
10. The function of a P-trap is to:
A. Speed drainage
B. Provide venting
C. Maintain water seal barrier
D. Reduce pipe diameter
Correct Answer: C
