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 OR-JP exam has 64 questions and runs 4 hours.
These 10 free OR-JP questions are organized by exam domain, so you can see how each part of the Oregon Journeyman Plumber License Exam blueprint is tested. Reveal the answer and explanation under each question.
The valve schedule specifies a bronze ball valve with 3/4-inch female NPT ports at both ends. It will be installed in a 3/4-inch copper line assembled with soldered joints. The material takeoff already includes the valve and tubing. Which addition completes both valve-to-tube connections?
Correct answer: A - Two male-NPT-by-solder adapters.
An issued plumbing detail dimensions a pipe leg at 60 inches center-to-center between fittings. On a reduced site copy, the same leg measures 54 inches when read with the original drawing scale. For the fabrication takeoff, which basis should determine the pipe cut length?
Correct answer: A - The 60-inch written dimension, less the effective fitting takeouts.
Two parallel pipe runs are to be joined by a rolling offset using two 45-degree elbows. Their centerlines are separated by a 12-inch rise and a perpendicular 16-inch roll. Each elbow has an effective takeout of 1.50 inches along the diagonal pipe. What straight-pipe cut length is required between the elbows, to the nearest 0.01 inch?
Correct answer: B - 25.28 inches
A 30-foot horizontal drain route must connect an upstream invert at elevation 100.50 feet to an existing downstream invert at 99.75 feet. Both elevations are fixed. The approved design requires a uniform grade of at least 1/4 inch per foot. Does the available fall permit this gravity connection?
Correct answer: C - Yes; 9 inches of fall is available, exceeding the required 7.5 inches.
Several fixtures have weak flow. Test gauges connected immediately before and after a cartridge filter both read 66 psi with no water running. At the same flow used during commissioning, the inlet gauge reads 62 psi and the outlet gauge reads 29 psi; the filter had very little pressure loss when new. Where should the repair effort start?
Correct answer: C - Isolate and service the filter, then repeat the flowing-pressure test.
After a water meter with an integral check valve is installed, a home's water pressure is 58 psi while the water heater is idle and climbs to 112 psi during recovery with all fixtures closed. Upstream pressure stays at 58 psi, and the heater's temperature controls operate normally. There is no thermal expansion control. What permanent correction best fits these findings?
Correct answer: C - Install a potable-water expansion tank on the heater's cold supply, downstream of the check valve.
A 2-inch sink drain approaches a 3-inch horizontal sanitary branch at a right angle. Both lines remain horizontal at the junction. Which fitting arrangement provides the required directional entry into the branch?
Correct answer: A - A reducing wye and a 45-degree bend, with the wye aimed downstream.
A potable-water makeup line serves a process loop containing a toxic corrosion inhibitor. The loop's pump can raise downstream pressure above the supply pressure, and the line remains continuously pressurized. The approved design calls for an in-line backflow prevention assembly. Which assembly matches both the hazard and the pressure conditions?
Correct answer: B - A reduced-pressure-principle backflow prevention assembly.
During permitted work in a sewer vault, the entrant becomes unresponsive and the atmospheric monitor alarms. The attendant is trained for the site's non-entry rescue procedure; the entrant's retrieval line is attached and the retrieval path is clear. The attendant is not trained or equipped for entry rescue. Which response puts the rescue plan into effect without creating a second victim?
Correct answer: D - Summon the designated rescue service and begin non-entry retrieval from outside the vault.
An adult wheelchair-accessible toilet compartment in a new public restroom contains a floor-mounted water closet. Measurements are taken from finished surfaces. Under the 2010 ADA Standards, which measurement fails its applicable dimensional requirement?
Correct answer: D - Compartment depth: 57 inches from the rear partition.
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