10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The AL-JP exam has 75 questions and runs 2.92 hours.
These 10 free AL-JP questions are organized by exam domain, so you can see how each part of the Alabama Journeyman Plumber Exam blueprint is tested. Reveal the answer and explanation under each question.
A customer reports weak flow throughout a house. Gauges immediately before and after the cartridge filter both read 68 psi with every fixture closed. With two faucets running, the inlet gauge reads 64 psi and the outlet gauge reads 27 psi. The filter's isolation valves are fully open. Where should the plumber concentrate the initial repair?
Correct answer: B - The filter cartridge, because the pressure loss develops across the filter
A fertilizer-injection system is connected to a potable-water supply. Its chemical pump can produce pressure above the supply pressure, and the connection is classified as a health hazard. The approved design permits a mechanical backflow-prevention assembly. Select the assembly that protects against the stated hazard and pressure condition.
Correct answer: B - A reduced-pressure-principle assembly
A cabinet plan places a lavatory trap 3 feet from its vent in a straight line. The piping detail, marked 'not to scale,' shows the trap arm running 2 feet out, 3 feet across, and 2 feet back. These developed dimensions include the bends. The 1 1/2-inch arm slopes uniformly at 1/4 inch per foot. The applicable 2021 IPC trap-arm limit is 6 feet of developed length. Which plan-review comment is correct?
Correct answer: D - Move the vent; the 7-foot developed trap arm exceeds the limit
Two parallel pipe runs require a rolling offset with 9 inches of sideways displacement and 12 inches of rise, measured centerline to centerline. Two 45-degree elbows will form the offset. The effective takeoff from each elbow centerline to the seated pipe end is 1 1/2 inches. Using 1.414 for the 45-degree travel multiplier, what straight pipe length should be cut between the elbows, to the nearest 1/8 inch?
Correct answer: C - 18 1/4 inches
An appliance's instructions specify 6 to 9 inches of water column at its gas inlet while firing. The plumber must resolve pressure differences of 0.2 inch of water column. All four available instruments are compatible with the gas. Which instrument has both a suitable range and sufficient resolution?
Correct answer: B - A 0-15 inch-water-column manometer with 0.1-inch resolution
On the second floor of a building, a horizontal fixture branch must carry 24 drainage fixture units to a vertical stack. A proposed 3-inch branch is pitched at 1/4 inch per foot. The installer cites the 42-DFU capacity for a 3-inch building drain at that slope. Under the 2021 IPC, how should this proposal be resolved?
Correct answer: C - Use 4-inch pipe because a 3-inch horizontal fixture branch is limited to 20 DFU
A laundry rough-in has a 2-inch standpipe and trap, a 2-inch fixture drain, and a properly located vent. The standpipe rises 30 inches above the trap weir. Its fixture drain joins a 2-inch horizontal fixture branch shared with a laundry tray. The installer argues that the combined fixture-unit load permits that branch size. What must change under the 2021 IPC?
Correct answer: A - Connect the washer fixture drain to a 3-inch or larger branch or stack
For a new building, the basement floor is at elevation 98.4 feet and the first floor is at 108.0 feet. The cover of the next upstream public-sewer manhole is at 101.2 feet. Both floors have plumbing fixtures. Which backwater-valve arrangement complies with the 2021 International Plumbing Code?
Correct answer: D - Install a basement-only backwater valve; connect first-floor drainage downstream
After a check valve is added at a home's water service, pressure downstream rises gradually from 60 psi to 105 psi during each water-heater recovery cycle. Opening a faucet promptly returns it to 60 psi. Water temperature remains normal, and the system has no expansion-control device. Which addition addresses the cause?
Correct answer: C - A properly sized potable-water thermal-expansion tank
During construction work, a plumber collapses inside a sewer vault. A coworker remains outside; a remote monitor indicates 18.2% oxygen. No retrieval line is attached, and the coworker is not trained or equipped for entry rescue. What is the immediate response?
Correct answer: A - Activate the emergency rescue plan and prevent additional entry
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