Geometric Dimensioning and Tolerancing_精品.doc

Answer Key Geometric Dimensioning and TolerancingFinal Examination Answer all questions in accordance with the ASME Y14.5M-1994 Standard. 1. A datum reference frame consists ofThree Mutually Perpendicular Planes 2. A numerical value used to specify the theoretically exact size, profile, orientation, or location of a feature is a Basic Dimension 3. A symbol used to identify physical features of a part as datums and shall not be applied to centerlines, center planes, or axes is called a Datum Feature Symbol 4. A physical portion of a part, such as a surface, pin, hole, tab, or slot is called a Feature 5. The theoretically exact location of a feature established by basic dimensions is called True Position 6. A feature that has a dimension such as a cylindrical surface or two opposed parallel surfaces is called a Feature of Size (Size Feature) 7. A constant boundary generated by the collective effects of the MMC limit of size of a feature and the applicable geometric tolerance is called Virtual Condition 8. A material condition used to indicate that a specified geometric tolerance or datum reference applies at each increment of size of a feature within its limits of size is called Regardless of Feature Size (RFS) 9. Feature orientation is controlled by the Primary datum. 10. What is the shape of a datum feature that is always associated with two theoretical planes intersecting at right angles at the datum axis? Cylindrical 11. Datum features must be specified in order of Precedence . 12. What kind of features always apply at MMC, LMC, or RFS? Feature of Size (Size Feature or Feature Subject to Size Variation) 13. When no geometric tolerance is specified, the size tolerance controls theGeometric Form (Form) as well as the size. 14. Regardless of Feature Size (RFS) automatically applies to individual tolerances and to datum features of size. MMC and LMC must be specified where required. .XX = ± .01 .XXX = ± .005 ANGLES = ± 1° 15. The hole