NCIDQ IDFX Practice Exam

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What is a "knuckle" in the context of hinges?

  1. The outer casing of the hinge

  2. The portion connecting two leaves of the hinge

  3. The pin that holds the leaves together

  4. The decorative finish of the hinge

The correct answer is: The portion connecting two leaves of the hinge

In the context of hinges, a "knuckle" refers specifically to the portion that connects two leaves of the hinge. This is a critical component because the knuckle allows the two parts of the hinge to pivot around the pin, facilitating movement. The design and construction of the knuckle are essential for the hinge's overall function and strength. The correct identification of the knuckle helps in understanding how hinges operate and are assembled, which is important in interior design—especially when selecting or installing doors and cabinetry. The other options, such as the outer casing, the pin, and the decorative finish, refer to different parts or features of a hinge but do not capture what a knuckle specifically is in function or structure.

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