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Material Selection Flashcards

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

Read the first 7 Material Selection flashcards as text

  1. What material should 15- or 20-amp receptacles have when they connect to aluminum branch-circuit conductors?

    Answer: CO/ALR rating

    Receptacles and switches of 15 and 20 amps that are used with aluminum wire must be marked CO/ALR.

  2. Which cable type is suitable for direct burial in residential work?

    Answer: Type UF

    Type UF (underground feeder) cable is listed for direct burial, but NM cable is not.

  3. Which material is required for medium-duty firebrick lining a masonry fireplace firebox?

    Answer: Firebrick complying with ASTM C27 or C1261

    IRC R1001.5 requires firebrick that meets ASTM C27 or C1261, at least 2 inches thick, set in refractory mortar.

  4. What maximum mesh opening does the IRC allow for corrosion-resistant attic ventilation screening?

    Answer: 1/4 inch

    Attic vent openings must be covered with corrosion-resistant mesh that has openings of at least 1/16 inch and no more than 1/4 inch.

  5. Which preservative treatment use category is required for lumber used in ground contact?

    Answer: UC4A

    AWPA Use Category 4A covers general ground contact applications for treated wood.

  6. Which change to a concrete mix most improves its resistance to freeze-thaw damage?

    Answer: Using air entrainment

    Air entrainment creates microscopic voids that relieve internal pressure when water freezes.

  7. When should corrugated sheet-metal ties for anchored masonry veneer be rejected?

    Answer: They are thinner than 0.031 inch (22 gage)

    IRC R703.8.4.1 requires corrugated veneer ties to be corrosion-resistant sheet metal at least 0.031 inch (22 gage) thick.