150 free practice questions for this exam, each with the reason for the answer and where to look it up.
10 questions, graded as you go, with the reason for every answer. No sign-up.
| Exam | Journeyman plumber |
|---|---|
| Who runs it | State and local boards |
| Where | United States (varies by state) |
Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.
Under both the IPC and the UPC, the liquid seal of a standard fixture trap must fall within what range?
B. 2 in. to 4 in.
Both model codes call for a seal of at least 2 in. and no more than 4 in. Less than 2 in. is too easily lost to pressure changes and evaporation; a much deeper seal slows flow and collects solids.
Reference: IPC 2021, Section 1002 (trap seals); UPC 2021, Section 1005
Under the Safe Drinking Water Act, solder and flux used on potable water piping may contain no more than what percentage of lead?
B. 0.2 percent
The Act defines lead free for solder and flux as not more than 0.2 percent lead. 0.25 percent is the separate limit for wetted surfaces of pipe, fittings and fixtures, and 8 percent was the old limit for pipe and fittings before 2014.
Reference: Safe Drinking Water Act, Section 1417 (42 U.S.C. 300g-6)
Why is a propane leak in a basement or pit especially dangerous?
B. Propane is heavier than air and collects in low areas
Propane vapor has a specific gravity of about 1.5, so it flows downward and pools in basements, pits and trenches where it can reach an ignition source. Like natural gas, commercial propane is odorized so leaks can be noticed.
Reference: NFPA 58 (LP-gas properties); NFPA 54
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Master plumber · Apprentice / tradesman plumber · Backflow prevention assembly tester · Cross-connection control specialist · Gas fitter / gas piping · LP gas / propane technician (CETP) · Pipefitter / steamfitter journeyman · Fire sprinkler fitter