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. A residential contractor is installing a 200-amp service panel. What minimum wire gauge is required for aluminum service entrance conductors at this ampacity?

    Answer: 2/0 AWG aluminum

    For a 200-amp service, 2/0 AWG (double-ought) aluminum conductors are the NEC-approved minimum size for service entrance cables.

  2. What is the purpose of a 'expansion tank' in a closed-loop residential water heater system?

    Answer: To absorb thermal expansion of heated water and prevent pressure buildup

    When a backflow preventer creates a closed system, an expansion tank absorbs the volume increase from heated water, preventing unsafe pressure spikes in the plumbing.

  3. Which type of duct insulation is required when supply ducts pass through an unconditioned attic space?

    Answer: Minimum R-8 insulation per the IECC

    The International Energy Conservation Code (IECC) requires supply ducts in unconditioned attics to be insulated to at least R-8 to minimize heating and cooling losses.

  4. A homeowner complains of a 'water hammer' — loud banging pipes when a faucet is turned off. What is the best remedy?

    Answer: Install water hammer arrestors near the affected fixtures

    Water hammer arrestors contain a chamber with an air cushion that absorbs the pressure wave created when water flow is suddenly stopped, eliminating pipe banging.

  5. When sizing a residential HVAC system, what is the primary calculation method used to determine heating and cooling loads?

    Answer: Manual J load calculation

    ACCA Manual J is the industry-standard protocol for calculating residential heating and cooling loads based on climate, insulation, windows, occupancy, and other factors.

  6. In residential electrical work, what is the purpose of a grounding electrode system (GES)?

    Answer: To provide a low-impedance path to earth that stabilizes voltage and dissipates fault current

    The GES connects the electrical system to the earth, providing a reference voltage, dissipating lightning surges, and offering a fault current path that activates overcurrent protection.