PC Inspection & Quality Control 2

Question 1

During a rough-in inspection, which measurement is the inspector most likely to verify for a toilet flange?

Accepted Answer

Distance from the finished wall to the flange center

Answer

Inspectors verify that the toilet flange center is 12 inches (or 10/14 inches for offset) from the finished wall to ensure proper toilet fit.

Question 2

Which test is required by most codes to verify the integrity of a DWV system before concealment?

Accepted Answer

Water or air test per local code, typically at 10 feet of water head

Answer

DWV systems are typically tested with water to a 10-foot head or with 5 psi air for a minimum of 15 minutes, per IPC/UPC requirements.

Question 3

An inspector finds that a horizontal drain pipe has zero slope over a 10-foot run. What is the correct action?

Accepted Answer

Require rework to achieve the minimum ¼ inch per foot slope

Answer

IPC and UPC require a minimum slope of ¼ inch per foot for drain pipes 3 inches and larger to ensure self-scouring flow.

Question 4

What is the primary purpose of a final plumbing inspection?

Accepted Answer

To confirm all fixtures are installed, functional, and the system is leak-free

Answer

The final inspection confirms that all fixtures are properly installed, all connections are watertight, and the system operates as designed.

Question 5

Which condition would cause an inspector to fail a water supply rough-in inspection?

Accepted Answer

CPVC pipe installed without expansion joints on a long run in a hot environment

Answer

CPVC and copper expand significantly with temperature changes; failing to allow for expansion on long runs can cause joint failures and leaks.

(PC) Plumber Certification Practice Test