Practice Test Geeks(CRC) Certified Residential Contractor Practice Test
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CRC Electrical, Plumbing & Mechanical Systems Flashcards

6 cards from real CRC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 CRC Electrical, Plumbing & Mechanical Systems flashcards as text

  1. What ventilation standard governs minimum fresh air requirements for residential buildings in the United States?

    Answer: ASHRAE 62.2

    ASHRAE Standard 62.2 establishes minimum ventilation rates and indoor air quality requirements specifically for low-rise residential buildings.

  2. A toilet's 'rough-in' measurement refers to the distance from the wall to what point?

    Answer: The center of the drain flange (closet flange)

    The rough-in dimension is measured from the finished wall to the centerline of the closet flange; the most common residential rough-in is 12 inches.

  3. Which type of residential water pipe material is flexible, freeze-resistant, and widely used in new construction since the 2000s?

    Answer: PEX (cross-linked polyethylene)

    PEX tubing is flexible, resistant to cracking from freezing, easy to install with fewer fittings, and is now the dominant residential supply pipe material in new U.S. construction.

  4. What is the function of an 'air admittance valve' (AAV) in a residential drain, waste, and vent system?

    Answer: To allow air into the drain system without connecting to a vent stack that penetrates the roof

    An AAV opens to admit air when negative pressure occurs in the drain (preventing siphoning of trap seals) and closes to block sewer gas, eliminating the need for a roof penetration.

  5. Arc Fault Circuit Interrupter (AFCI) breakers are required by the NEC in which areas of a new residential build?

    Answer: All 120-volt, 15- and 20-amp circuits in dwelling unit bedrooms, living rooms, and most habitable spaces

    Current NEC editions require AFCI protection for nearly all 120V branch circuits in habitable rooms of a dwelling, as arc faults are a leading cause of residential electrical fires.

  6. What is the primary reason a residential HVAC contractor performs a duct blaster test?

    Answer: To measure air leakage from the duct system and identify efficiency losses

    A duct blaster test pressurizes the duct system and measures leakage rate, helping identify unsealed joints or holes that waste energy and reduce system efficiency.