Practice test

Plumbing Practice Exam 15

Expert plumbing practice exam, 25 hard questions on friction budgets, RPZ testing, mixed demand curves, vent upsizing, and gas longest-length sizing. Explanations.

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These questions are for study practice only and are not official exam questions.

Question 1

1

A water service is 150 feet of developed length and must deliver 80 gpm. Available friction head after subtracting residual, elevation, and device losses is 12 psi. The allowable friction loss per 100 feet is closest to what?

Question 2

2

A mixed system has 150 WSFU of flush tanks and 30 WSFU of flushometers. The most accurate demand estimate combines them how?

Question 3

3

An RPZ relief valve discharges to a floor drain through an air gap. If the air gap is omitted and the relief is hard-piped to the drain, what hazard arises?

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