Practice test

Plumbing Practice Exam 17

Expert plumbing practice exam, 25 questions on induced siphonage, drainage fittings, combination waste-vent, gas connectors, and recovery math. Full explanations.

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Question 1

1

A high-rise soil stack experiences trap-seal loss on the 9th floor when upper floors flush. The most likely pneumatic cause is what?

Question 2

2

A 4-inch horizontal branch must connect to a 4-inch stack. The correct drainage fitting for this horizontal-to-vertical connection is what?

Question 3

3

A combination waste-and-vent system relies on half-full flow. If the horizontal pipe is sized too small and runs full, what fails?

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