Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Runout and Concentricity Flashcards

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Read the first 7 Runout and Concentricity flashcards as text

  1. What instrument is most commonly used to measure runout in a production environment?

    Answer: Dial test indicator (DTI) with the part rotating on centers or in a chuck

    A dial test indicator placed against the surface while the part rotates on centers or in a V-block is the standard production method for measuring runout.

  2. If a shaft is bent (curved axis), which runout measurement will show the largest FIM reading?

    Answer: Total runout along the full length

    Total runout captures all cumulative surface deviations including the effect of a bent axis along the entire length, giving the largest FIM reading.

  3. Concentricity is removed from ASME Y14.5-2018. What control replaces it for most design intents?

    Answer: Coaxiality using position

    ASME Y14.5-2018 removed concentricity and recommends using position applied to the axis (coaxiality) as a more verifiable replacement.

  4. A print specifies circular runout of 0.05 mm on a journal bearing surface. The measured FIM at one cross-section is 0.06 mm. What action should be taken?

    Answer: Reject the part as it exceeds the specified tolerance

    Circular runout must be within tolerance at every cross-section; a single cross-section exceeding 0.05 mm causes rejection.

  5. Which of the following best describes the tolerance zone for total runout on a cylindrical surface?

    Answer: Two coaxial cylinders with a radial distance equal to the tolerance value

    The total runout tolerance zone for a cylinder is defined by two coaxial cylinders, one inside the other, separated by the stated tolerance value.

  6. On a drawing, runout is specified with datum reference A, which is a short cylindrical feature. What concern might an inspector raise?

    Answer: Short datum features can be less stable for establishing an accurate axis

    Short datum features provide limited constraint for establishing a stable axis, which can introduce uncertainty in the runout measurement.

  7. When a face and diameter are used together as compound datums for runout, what geometric relationship do they establish?

    Answer: A datum axis perpendicular to a datum plane at a specific point

    A compound datum combining a face and diameter establishes a datum axis that is perpendicular to the face and coincident with the diameter's axis.