Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Position Tolerancing Calculations 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 Position Tolerancing Calculations flashcards as text

  1. A hole is located at basic X = 40.00, Y = 30.00. The CMM measures the hole axis at X = 40.05, Y = 29.96. What is the diametral position error?

    Answer: ⌀0.128

    Δx = 0.05, Δy = 0.04; radial = √(0.0025 + 0.0016) = √0.0041 ≈ 0.064; diametral = 2 × 0.064 ≈ ⌀0.128.

  2. What does the term 'virtual condition' mean for an internal feature (hole) controlled with position at MMC?

    Answer: MMC size minus the position tolerance

    For an internal feature, virtual condition = MMC size − position tolerance, representing the worst-case boundary for assembly.

  3. A pin (external feature) has MMC = 12.0 mm and a position tolerance of ⌀0.3. What is its virtual condition?

    Answer: 12.3 mm

    For an external feature, virtual condition = MMC + position tolerance = 12.0 + 0.3 = 12.3 mm.

  4. Projected tolerance zone is specified because:

    Answer: It controls the zone where a fastener extends outside the part, preventing interference at assembly

    A projected tolerance zone extends the positional control above the hole to where mating fasteners or studs will reside, preventing angular stack-up issues.

  5. If a position callout reads ⌀0.25 (M) with a projected tolerance of 15 mm, what does '15' represent?

    Answer: The minimum projection height above the part surface

    The projected tolerance zone height (15 mm) specifies how far the cylindrical zone extends beyond the part surface to capture fastener axis deviation.

  6. A zero tolerance at MMC callout (⌀0.000 (M)) means:

    Answer: The entire size tolerance becomes available as bonus position tolerance when at actual size

    With ⌀0.000 at MMC, there is no fixed tolerance; all allowable variation comes exclusively from bonus tolerance as the feature departs from MMC.

  7. Which statement correctly describes the 'inner boundary' of a hole controlled with position at MMC?

    Answer: MMC size minus position tolerance

    The inner boundary (worst-case minimum size) = MMC − position tolerance, which equals the virtual condition for an internal feature.