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

Height above finished floor

Answer

Diameter of the closet bend

Answer

Depth below the subfloor

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

Hydrostatic pressure test at 100 psi

Answer

Air pressure test at 5 psi for 15 minutes

Answer

Smoke test at 1 psi

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

Accept it if the pipe is 4 inches or larger

Answer

Require rework to achieve ½ inch per foot slope

Answer

Accept it because large-diameter pipes self-clean at zero slope

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

To verify fixture rough-in dimensions only

Answer

To check permit fees have been paid

Answer

To measure water pressure at the meter

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

Copper pipe supported every 6 feet horizontally

Answer

PEX tubing protected with grommets through metal studs

Answer

Pressure-reducing valve installed on the service entrance

Question 6

When inspecting a water heater installation, which clearance is the inspector checking to prevent a fire hazard?

Accepted Answer

Minimum 18-inch clearance from the floor for the ignition source in garages

Answer

Minimum 6-inch clearance from combustible walls for gas water heaters

Answer

Minimum 12-inch clearance from combustible materials for the flue vent

Answer

Minimum 1-inch clearance between the tank and the floor

Question 7

An inspector notices a P-trap arm that exceeds the maximum developed length before venting. What violation does this represent?

Accepted Answer

Trap seal loss due to self-siphoning

Answer

Excessive friction loss in the drain

Answer

Illegal fixture unit count on the branch

Answer

Inadequate cleanout placement