Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Material Condition Modifiers 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 Material Condition Modifiers flashcards as text

  1. A shaft has a true position tolerance of 0.2 MMC. At MMC the shaft diameter is 20.0 mm. If the shaft is produced at 19.8 mm, what is the total allowable position tolerance?

    Answer: 0.4 mm

    The shaft has departed 0.2 mm from MMC, so the bonus tolerance (0.2) is added to the stated tolerance (0.2), giving 0.4 mm total.

  2. Which material condition modifier requires the tolerance zone to remain fixed regardless of the feature's actual size?

    Answer: RFS

    RFS (Regardless of Feature Size) means the specified tolerance applies at every actual mating size with no bonus tolerance.

  3. On an internal feature (hole), the LMC condition corresponds to which of the following?

    Answer: Smallest allowable hole diameter

    For a hole (internal feature), LMC is the smallest diameter because that represents the least material removed.

  4. The virtual condition of an external feature controlled at MMC is calculated as:

    Answer: MMC size plus the geometric tolerance

    For an external feature (e.g., shaft) at MMC, the virtual condition = MMC size + geometric tolerance, representing the worst-case boundary.

  5. Which modifier, when applied to a datum feature, allows the datum to shift as the feature departs from its referenced material condition?

    Answer: MMC on a datum reference

    Applying MMC (or LMC) to a datum reference in a feature control frame allows datum shift equal to the departure from that material condition.

  6. A hole has a diameter tolerance of 10.0–10.4 mm and a perpendicularity tolerance of 0.1 at MMC. What is the perpendicularity tolerance when the hole is produced at 10.4 mm (LMC)?

    Answer: 0.5 mm

    At LMC (10.4 mm) the departure from MMC (10.0) is 0.4 mm, adding 0.4 bonus to the 0.1 stated tolerance gives 0.5 mm.

  7. Under ASME Y14.5-2009, when no material condition modifier is specified for a feature of size, which modifier is implied?

    Answer: RFS

    ASME Y14.5-2009 established RFS as the default when no modifier symbol is shown in the feature control frame.