Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Form and Orientation Tolerances 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 Form and Orientation Tolerances flashcards as text

  1. A feature control frame shows perpendicularity with an MMC modifier (Ⓜ) applied to a pin. As the pin's actual size departs from MMC, the perpendicularity tolerance:

    Answer: Increases by the same amount as the departure

    The MMC modifier creates a bonus tolerance: for each unit the pin departs from MMC toward LMC, the perpendicularity tolerance increases by one unit.

  2. Which GD&T control is most appropriate to ensure two mating flat surfaces will make full contact (not rock)?

    Answer: Flatness

    Flatness controls how planar a single surface is, preventing rocking or wobble when two surfaces are mated.

  3. Under ASME Y14.5-2018, which modifier can be applied to straightness of a derived median line to allow additional tolerance?

    Answer: Maximum Material Condition (MMC) or Least Material Condition (LMC)

    Straightness of a derived median line may use MMC or LMC modifiers to grant bonus tolerance as the feature departs from the specified material condition.

  4. A parallelism callout of 0.1 on a surface with datum A means the surface must:

    Answer: Lie between two planes 0.1 apart and parallel to datum A

    Parallelism creates a tolerance zone of two parallel planes separated by the tolerance value, both parallel to the referenced datum.

  5. When a perpendicularity tolerance is applied to a flat surface (not an axis), which modifier is NOT applicable?

    Answer: Maximum Material Condition (MMC)

    MMC and LMC modifiers apply only to features of size (axes or center planes), not to surfaces; perpendicularity on a flat surface cannot use MMC.

  6. A cylindricity tolerance of 0.03 mm means the entire cylindrical surface must fit between two coaxial cylinders whose radii differ by:

    Answer: 0.03 mm

    The cylindricity tolerance value of 0.03 mm equals the total radial difference between the two coaxial boundary cylinders.

  7. Which scenario correctly describes an angularity tolerance application?

    Answer: A surface must be at 30° to datum C within a 0.05-wide zone

    Angularity controls a feature at a specified angle (other than 0° or 90°) to a datum, with the tolerance zone parallel to that angle.