PC Inspection & Quality Control 3

Question 1

During a gas piping pressure test, the inspector requires holding 1.5 times the working pressure for at least 10 minutes with no pressure drop. What does any pressure drop indicate?

Accepted Answer

A leak in the gas piping system

Answer

Normal pressure equalization

Answer

Faulty gauge calibration only

Answer

Acceptable pipe expansion

Question 2

A plumber installs a backflow preventer on a lawn irrigation system. Which document does the inspector typically require to confirm it was tested?

Accepted Answer

A certified backflow test report from a licensed tester

Answer

Manufacturer's installation manual

Answer

The plumbing permit application

Answer

The local water utility pressure record

Question 3

Which of the following pipe materials requires an inspector to look for dielectric unions at connections to dissimilar metals?

Accepted Answer

Copper to galvanized steel

Answer

PVC to ABS

Answer

PEX to copper

Answer

CPVC to PVC

Question 4

What is the inspector verifying when checking that a floor drain has a trap primer connection in a commercial building?

Accepted Answer

That the trap seal will be maintained even when the drain is rarely used

Answer

That the drain meets the minimum 4-inch diameter requirement

Answer

That the drain is connected to a separate sanitary line

Answer

That a backflow valve is installed downstream

Question 5

An inspector rejects a shower installation because the mortar bed slopes toward the wall instead of the drain. What defect does this cause?

Accepted Answer

Water pooling against the wall, leading to moisture damage and mold

Answer

Insufficient hot water delivery

Answer

Excessive drain flow rate

Answer

Inadequate water pressure at the showerhead

Question 6

Which inspection finding would require a plumber to re-pipe a section of supply line rather than simply adding supports?

Accepted Answer

Lead-based solder used on potable water supply lines in a residential renovation

Answer

Copper tubing supported every 8 feet instead of every 6 feet

Answer

Type L copper used instead of Type M in a residential application

Answer

PEX installed in a crawlspace with UV-blocking insulation

Question 7

What is the inspector confirming when verifying that a sanitary tee is installed in the correct orientation on a horizontal-to-vertical drain transition?

Accepted Answer

That the branch inlet points upward to receive flow from fixtures, not downward

Answer

That the hub faces upstream

Answer

That the fitting is the correct diameter

Answer

That a cleanout plug is installed in the unused port