Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Surface Finish & Assembly Requirements Flashcards

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

Read the first 7 Surface Finish & Assembly Requirements flashcards as text

  1. On a drawing, the surface texture symbol with a horizontal bar beneath it indicates:

    Answer: Material removal is prohibited

    A horizontal bar beneath the surface texture symbol means material removal by machining is NOT permitted on that surface.

  2. Which Ra value represents the smoothest surface finish?

    Answer: Ra 0.8 μm

    Ra 0.8 μm has the smallest average roughness value, making it the smoothest of the listed options.

  3. A bearing bore drawing specifies a surface finish of Ra 0.4 μm and a flatness tolerance of 0.02 mm. What is the correct interpretation?

    Answer: Both the surface finish and flatness must independently be met

    Surface texture and geometric tolerances are independent requirements; both must be satisfied simultaneously.

  4. In an assembly where a gasket seals between two flanges, which surface finish parameter is MOST critical for sealing performance?

    Answer: Rp (maximum peak height)

    Rp (maximum peak height) is critical for sealing because high peaks can puncture soft gaskets and prevent a proper seal.

  5. A profile of a surface tolerance applied all-around a part also controls:

    Answer: Size, form, orientation, and location of that surface

    Profile of a surface is a comprehensive tolerance that simultaneously controls size, form, orientation, and location when datums are referenced.

  6. When two mating surfaces must slide against each other under load, the designer should specify a surface finish that is:

    Answer: Smooth enough to reduce wear but not so smooth as to cause adhesion

    Optimal tribological performance requires surfaces smooth enough to limit wear but with some texture to retain lubricant and prevent adhesive wear.

  7. Which symbol in ASME Y14.5 indicates that a surface must be produced by a specific manufacturing process noted in the tail of the surface texture symbol?

    Answer: Text written in the tail/extension of the symbol

    The tail or horizontal extension of the surface texture symbol is where the manufacturing process (e.g., 'grind', 'lap') is specified.