Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Profile Tolerancing Applications Flashcards

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  1. When a profile of a surface tolerance is used to control a flat planar surface (instead of flatness), what additional control does profile provide over flatness?

    Answer: Profile can also control orientation and location when datums are referenced

    Unlike flatness (form only), profile of a surface with datum references can simultaneously control the orientation and location of a flat surface in addition to its form.

  2. A profile tolerance zone that is defined as entirely OUTSIDE the true profile (unilateral-outward) would be specified using ASME Y14.5-2018 by:

    Answer: Adding a UZ modifier with the offset value

    In ASME Y14.5-2018, the UZ (Unequally Disposed Zone) modifier with an offset value specifies where the profile tolerance zone is positioned relative to the true profile.

  3. In the context of profile tolerancing, what does 'between' notation (using the symbol ↔ or the word BETWEEN) indicate?

    Answer: The profile tolerance applies only to the portion of the surface between two specified points or features

    The 'between' notation limits the profile tolerance application to a specific portion of the surface, bounded by two designated points or features.

  4. Which inspection method is most suitable for verifying a complex profile tolerance on a freeform surface?

    Answer: Coordinate Measuring Machine (CMM) with CAD model comparison

    A CMM compared against a CAD model is the most effective method for verifying complex freeform profile tolerances because it captures the full 3D surface geometry.

  5. If a profile of a surface tolerance references only Datum A (a plane), which degrees of freedom does it constrain?

    Answer: Translation perpendicular to A and two rotational degrees of freedom (tilts relative to A)

    A single planar datum A constrains translation perpendicular to it plus rotation about two axes (pitch and roll relative to the plane), leaving translation along A and rotation about A's normal free.

  6. A profile tolerance applied to a conical surface primarily replaces which combination of traditional tolerances?

    Answer: Angularity and cylindricity

    Profile of a surface on a cone effectively controls both the angle (similar to angularity) and the roundness/form (similar to cylindricity) of the conical surface simultaneously.

  7. When a single profile of a surface tolerance simultaneously controls an entire part with complex geometry, this approach is sometimes called:

    Answer: Profile with all-over application

    Applying profile of a surface 'all over' (indicated by two concentric circles) controls the entire part's surface geometry with a single tolerance specification.