Inspection & Quality Control Flashcards
7 cards from real PC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Inspection & Quality Control flashcards as text
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?
Answer: A leak in the gas piping system
Any measurable pressure drop during a gas piping test indicates a leak that must be located and repaired before the system can pass inspection.
A plumber installs a backflow preventer on a lawn irrigation system. Which document does the inspector typically require to confirm it was tested?
Answer: A certified backflow test report from a licensed tester
Most jurisdictions require a certified tester to perform and document a functional test of backflow preventers at installation and annually thereafter.
Which of the following pipe materials requires an inspector to look for dielectric unions at connections to dissimilar metals?
Answer: Copper to galvanized steel
Copper and galvanized steel create a galvanic couple that accelerates corrosion; dielectric unions electrically isolate them to prevent this.
What is the inspector verifying when checking that a floor drain has a trap primer connection in a commercial building?
Answer: That the trap seal will be maintained even when the drain is rarely used
Trap primers periodically add water to infrequently used floor drain traps to prevent the trap seal from evaporating and allowing sewer gas entry.
An inspector rejects a shower installation because the mortar bed slopes toward the wall instead of the drain. What defect does this cause?
Answer: Water pooling against the wall, leading to moisture damage and mold
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.
Which inspection finding would require a plumber to re-pipe a section of supply line rather than simply adding supports?
Answer: Lead-based solder used on potable water supply lines in a residential renovation
Lead-based solder on potable water lines is prohibited; the affected section must be cut out and re-soldered with lead-free (≤0.2% lead) solder.
What is the inspector confirming when verifying that a sanitary tee is installed in the correct orientation on a horizontal-to-vertical drain transition?
Answer: That the branch inlet points upward to receive flow from fixtures, not downward
A sanitary tee installed on its back (hub pointing down) on a horizontal run is prohibited because it causes turbulence and can block solids; it must be used only in vertical-to-horizontal transitions.