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

Any measurable pressure drop during a gas piping test indicates a leak that must be located and repaired before the system can pass inspection.

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

Most jurisdictions require a certified tester to perform and document a functional test of backflow preventers at installation and annually thereafter.

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

Copper and galvanized steel create a galvanic couple that accelerates corrosion; dielectric unions electrically isolate them to prevent this.

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

Trap primers periodically add water to infrequently used floor drain traps to prevent the trap seal from evaporating and allowing sewer gas entry.

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

A shower floor must slope uniformly toward the drain at ¼ inch per foot; reverse slope traps water at walls, causing leaks and mold behind tile.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Inspection & Quality Control 3