Practice test

California Plumbing Practice Test

Free California plumbing practice test with 20 questions on water supply, DWV systems, plumbing code principles, and CSLB C-36 contractor licensing.

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

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Question 1

1

Why are backflow prevention devices required at cross-connections between a potable water supply and a non-potable source?

Question 2

2

A building's water supply pressure regulator is set too high. What is the most likely downstream consequence?

Question 3

3

A fixture drain repeatedly loses its trap seal through siphoning even though the trap itself is correctly sized. What is the most likely cause?

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