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. A part drawing specifies flatness of 0.05 mm on a mounting surface. Flatness controls:

    Answer: How flat the surface is regardless of its location or orientation

    Flatness is a form control that restricts only the shape of the surface without any datum reference, meaning location and orientation are not controlled.

  2. For a press-fit pin in a housing, the designer increases the surface roughness of the pin. What is the likely design intent?

    Answer: Increase friction and holding force after pressing

    Higher surface roughness increases the interlocking of asperities in a press fit, which raises the axial and torque holding force of the joint.

  3. Which of the following best defines 'waviness' in surface texture measurement?

    Answer: Long-wavelength deviations exceeding the roughness cutoff wavelength

    Waviness consists of longer-wavelength surface irregularities that remain after the roughness (short-wavelength) component is filtered out.

  4. A part with a profile of a surface callout referenced to datums A, B, and C controls:

    Answer: Form, orientation, and location simultaneously

    When datums are referenced with a profile of a surface tolerance, it simultaneously controls form, orientation, and location of the surface.

  5. In GD&T, the surface texture symbol (check mark shape) without any modification means:

    Answer: Material removal by any process is acceptable

    The basic surface texture symbol (check mark without a bar) indicates that any manufacturing process capable of achieving the specified roughness is acceptable.

  6. A hydraulic cylinder bore must maintain an oil film. Which surface texture specification is MOST appropriate?

    Answer: Ra 0.4 μm with cross-hatch (angular) lay from honing

    Honed cross-hatch patterns at Ra ~0.4 μm retain oil in the valleys while providing adequate sealing with piston rings, which is the industry standard for cylinder bores.

  7. Two mating flat surfaces in an assembly each have a flatness tolerance of 0.03 mm. What is the worst-case combined flatness deviation between them?

    Answer: 0.06 mm

    In the worst case, both surfaces bow in opposite directions; the combined effect stacks the tolerances, giving a maximum gap variation of 0.03 + 0.03 = 0.06 mm.