Practice Test Geeks(CCI) Certified Construction Inspector Practice Test
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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

  1. What is the purpose of a vacuum breaker installed on a hose bibb?

    Answer: Prevent back-siphonage of contaminated water into the potable supply

    A hose bibb vacuum breaker prevents back-siphonage by breaking the vacuum that could draw potentially contaminated water (e.g., from a garden hose in a bucket) back into the supply.

  2. When inspecting a refrigerant piping installation for an HVAC system, what is required at penetrations through fire-rated assemblies?

    Answer: Fire-rated caulk or an approved through-penetration firestop system

    Penetrations through fire-rated walls, floors, or ceilings must be sealed with an approved firestop system to maintain the fire-resistance rating of the assembly.

  3. What is the maximum developed length of a trap arm between the trap weir and the vent for a 2-inch drain pipe?

    Answer: 6 feet

    Per the IPC, a 2-inch trap arm has a maximum developed length of 6 feet from the trap weir to the vent connection.

  4. An inspector finds that a gas meter is installed inside a utility closet within a residential building. This is:

    Answer: A code violation — gas meters must be installed outdoors or in ventilated meter rooms

    Gas meters must be installed outdoors or in dedicated ventilated meter rooms per the IFGC; installation inside occupied building closets is generally prohibited.

  5. Under the IMC, what is the minimum required mechanical ventilation rate for a commercial restroom?

    Answer: 50 cfm per water closet or urinal

    The IMC requires exhaust ventilation in commercial toilet rooms at a minimum of 50 cfm per water closet or urinal, or as determined by ASHRAE 62.1.

  6. A cross-connection between the irrigation system and potable water supply is discovered during inspection. The required protection at minimum is:

    Answer: A reduced pressure zone (RPZ) backflow preventer

    Irrigation systems connected to potable water with chemical injectors or submerged sprinkler heads require an RPZ device, which is testable and provides the highest level of backflow protection.

  7. What is the required minimum pipe size for a building sewer serving a building with 40 drainage fixture units (DFU)?

    Answer: 4 inches

    Per IPC Table 710.1(2), a 4-inch building sewer at 1/4-inch per foot slope can accommodate up to 216 DFUs, making it sufficient for a 40 DFU load.