Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Tolerance Stack-up Analysis Flashcards

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  1. What is the primary purpose of tolerance stack-up analysis in GD&T?

    Answer: To determine the worst-case variation in an assembly due to accumulated tolerances

    Tolerance stack-up analysis determines how individual part tolerances accumulate to affect the overall assembly variation in the worst case.

  2. In a worst-case tolerance stack-up, how are individual tolerances combined?

    Answer: They are arithmetically added, assuming all tolerances at their maximum

    Worst-case analysis adds all tolerances arithmetically, assuming each feature is simultaneously at its maximum tolerance limit.

  3. What does RSS (Root Sum Square) analysis assume about the distribution of actual part dimensions?

    Answer: Parts follow a normal (Gaussian) distribution

    RSS analysis assumes part dimensions follow a normal distribution, which is typical for manufacturing processes under statistical control.

  4. Which type of tolerance stack-up analysis is more conservative and results in a larger required total tolerance?

    Answer: Worst-case (arithmetic) analysis

    Worst-case analysis is the most conservative because it assumes all tolerances simultaneously reach their extreme values, producing the largest possible variation.

  5. In a linear worst-case tolerance stack-up, what is the total gap variation if three dimensions each have a bilateral tolerance of ±0.1 mm?

    Answer: ±0.3 mm

    In worst-case analysis, tolerances add arithmetically, so three ±0.1 mm tolerances accumulate to a total variation of ±0.3 mm.

  6. What is a 'loop diagram' used for in tolerance stack-up analysis?

    Answer: To identify which dimensions contribute to a critical assembly gap or interference

    A loop diagram traces a closed path through the assembly dimensions to identify which tolerances contribute to a critical gap, clearance, or interference condition.

  7. When should tolerance stack-up analysis be performed during product development?

    Answer: Early in the design phase before drawings are released

    Tolerance stack-up analysis should be performed early in the design phase to identify potential assembly problems and optimize tolerance allocation before manufacturing begins.