Practice Test Geeks(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test
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Symbols and Rules 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.

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  1. What does the 'free state' symbol (circle with the letter F) indicate in a GD&T callout?

    Answer: The tolerance applies after release from manufacturing fixturing

    The free state modifier indicates that the geometric tolerance applies to the part in its unconstrained, free state — not held in a fixture.

  2. A profile of a line tolerance differs from a profile of a surface tolerance in that it:

    Answer: Controls only a cross-sectional slice at any given location

    Profile of a line controls the shape of a cross-sectional profile at individual cross-sections, while profile of a surface controls the complete 3D form.

  3. In a feature control frame, the compartment immediately following the tolerance value compartment contains:

    Answer: The primary datum reference

    After the tolerance value (and any modifier on it), the next compartments list datum references in order: primary, secondary, then tertiary.

  4. Which symbol, when placed below a feature control frame, indicates that the tolerance applies to the entire length or surface — not per unit?

    Answer: No additional symbol is needed; it applies to the entire extent by default

    By default, a geometric tolerance applies to the full extent of the feature unless a 'per unit' basis is specified separately below the frame.

  5. Which of the following is NOT a valid runout tolerance symbol in ASME Y14.5?

    Answer: Total Runout of a Plane Surface

    There is no separate GD&T symbol called 'Total Runout of a Plane Surface'; Total Runout (the arrow symbol) covers cylindrical and planar surfaces within one symbol.

  6. The diameter symbol (ø) placed before a tolerance value in a feature control frame means the tolerance zone is:

    Answer: Cylindrical

    When ø precedes the tolerance value, the tolerance zone is a cylinder of that diameter surrounding the true axis or center.

  7. According to ASME Y14.5, which rule governs the relationship between size tolerance and form tolerance for an individual feature of size?

    Answer: Rule #1 (Envelope Principle)

    Rule #1 (the Envelope Principle) states that the form of an individual feature of size must be within a perfect geometric envelope at MMC.