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. Which statement correctly compares the virtual condition of a hole controlled at MMC versus the same hole controlled at LMC?

    Answer: The MMC virtual condition is a smaller (tighter) inner boundary than the LMC virtual condition

    For a hole at MMC, virtual condition = MMC size − tolerance (smallest inner boundary); at LMC, resultant condition uses LMC − max tolerance, but virtual condition at LMC = LMC + tolerance (largest outer boundary), serving a different purpose.

  2. A position tolerance is given as 0.0 Ⓜ in a feature control frame. What does this indicate?

    Answer: No positional error is allowed unless the feature departs from MMC, then bonus tolerance becomes available

    A zero MMC tolerance means perfect position at MMC, but bonus tolerance accumulates as the feature departs from MMC, allowing positional error proportional to size departure.

  3. Under ASME Y14.5, which of the following tolerances CAN be legally modified with LMC?

    Answer: True Position of a hole

    True position references a feature of size (the hole), so LMC is applicable; surface-only controls like flatness, circularity, and surface parallelism cannot use material condition modifiers.

  4. When inspecting a feature using a functional (hard) gauge designed for an MMC position callout, a part that passes the gauge is considered:

    Answer: Acceptable for the virtual condition boundary requirement only; size still needs separate verification

    A functional gauge verifies the virtual condition (worst-case boundary) but does not verify the size tolerance, which requires a separate attribute or variable measurement.

  5. An engineer wants to ensure a minimum edge distance is maintained as a hole's position shifts. Which modifier applied to the position tolerance would best protect edge distance?

    Answer: LMC — provides tighter positional control when the hole is at its largest (least material)

    LMC tightens position control as the hole grows larger (less edge material), protecting minimum edge distance at the worst-case scenario.

  6. A datum feature of size is referenced as 'A Ⓜ' in a feature control frame. The datum feature has a size tolerance of 12.0–12.4 mm and is produced at 12.2 mm. How much datum shift is available?

    Answer: 0.2 mm

    Datum shift = departure from MMC = actual size (12.2) − MMC (12.0) = 0.2 mm for this external datum feature.

  7. Which of the following best describes the 'inner boundary' of an internal feature (hole)?

    Answer: The smallest permissible boundary, considering both size and geometric tolerance

    The inner boundary is the most restrictive (smallest) envelope a perfect counterpart must clear, accounting for both minimum size and maximum geometric error.