Practice test

Plumbing Practice Exam 12

Advanced 25-question plumbing practice exam on friction budgets, demand curves, DWV stack loads, gas sizing, and code scenarios. Scored with full explanations.

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

Question 1

1

A water service must deliver 60 gpm with no more than 8 psi friction loss over 120 feet of developed length. Using a friction loss budget, the allowable loss per 100 feet is closest to what?

Question 2

2

A system has 80 psi available, needs 25 psi residual at the top fixture, has 35 feet of elevation, and 4 psi of meter and device losses. How much pressure remains as a budget for pipe friction?

Question 3

3

A 2-inch RPZ is installed on a fire-line feed used for lawn irrigation. During a test the relief valve continuously drips a small amount. The most likely cause is what?

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