Plumbing & Mechanical Systems Flashcards
7 cards from real CCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Plumbing & Mechanical Systems flashcards as text
A wet vent serves which dual purpose in a plumbing system?
Answer: Functions as both a drain pipe and a vent pipe simultaneously
A wet vent carries waste from one fixture while also providing the vent for other fixtures connected to it, reducing the number of pipes required.
When inspecting a water heater installation, which condition would be a code violation?
Answer: No seismic strapping in a high seismic zone
In seismic zones C, D, E, and F, water heaters must be strapped to resist seismic movement per the IPC and local amendments; absence of strapping is a violation.
What is the maximum water temperature allowed at accessible fixtures such as showers and bathtubs serving non-scald protection requirements per the IPC?
Answer: 120°F
The IPC requires the use of pressure-balancing or thermostatic mixing valves to limit shower and tub water temperature to a maximum of 120°F to prevent scalding.
Under the IMC, supply air ducts in a forced-air HVAC system must be sealed to what leakage class when located outside conditioned space?
Answer: Sealed with mastic or approved tape at all seams and joints
Ducts outside conditioned space must be sealed with mastic sealant or approved duct tape at all seams and joints to prevent energy loss and pressure imbalance.
What is the minimum required size of a cleanout opening for a 4-inch diameter horizontal drain pipe?
Answer: 3 inches
Per the IPC, cleanouts for pipes 4 inches and larger must have openings at least as large as the pipe they serve, but can be reduced to the next nominal size; 3-inch is the typical minimum for 4-inch pipe.
A compressed air system in a commercial building requires a pressure relief valve set at what pressure relative to the maximum allowable working pressure (MAWP)?
Answer: Equal to or less than the MAWP
Pressure relief valves must be set to open at or below the MAWP of the lowest-rated component in the system to prevent over-pressurization.
Which plumbing fixture requires a floor drain within 6 inches as a code requirement per the IPC?
Answer: Water heater in a basement
Water heaters not located in a garage must have a drain pan or floor drain within 6 inches when located in areas where leakage could cause structural damage.