Experience the Quality With Free Journeyman Plumber Exam Questions That Helps Candidates Pass

Fixture units are a way to quantify demand. 1 FU ≈ 7.5 gpm. At 8 gpm, this equates to just over 1 FU, but codes typically round up to the next whole fixture unit, so it counts as 2 FU. Journeyman exams include such problems to test the ability to apply fixture unit values to system sizing. Understanding this conversion ensures proper pipe sizing and prevents undersized systems.

Pressure loss = 50 × 0.433 = 21.65 psi. 80 – 21.65 ≈ 58 psi. With rounding and safety margins, exam answers often list 52–58 psi. The closest correct choice here is 52 psi. Journeyman exams test this to ensure plumbers apply the 0.433 psi/ft rule correctly.

The cleanout must be at least the same nominal size as the drain it serves up to 4 inches in diameter. For drains larger than 4 inches, cleanouts may be 4 inches. Journeyman exams test this because proper cleanout sizing ensures accessibility for maintenance and code compliance.

Bathtubs require a minimum 1 ½-inch trap and trap arm. This ensures proper drainage and trap seal retention. Journeyman exams frequently test minimum trap sizes because undersized traps cause blockages and inspection failures.

Soda machines use carbon dioxide and syrups, creating a high hazard condition that requires RPZ protection. This prevents backflow of contaminated liquids into potable supply. Journeyman exams emphasize this because food service installations are common and heavily regulated.