Gd and T
Circle T if the statement is true. Circle F if the statement isfalse.
1.      The MMB and LMB symbols are onlyused if the datum feature has size RMB is implied if the datumfeature has size and no boundary symbol is used. No materialboundary symbol can be used if a feature does not have size.
2.      Unit straightness can be used ifthe part must be controlled per unit of measure as well as over thetotal length.
3.      Specific area flatness should beavoided on very large parts
4.      Circularity is a profiletolerance.
5.      Cylindricity is identified by aradius tolerance zone that establishes two perfect concentriccylinders.
6.      A parallelism tolerance zone mustbe smaller than the size tolerance of feature.
7.      The perpendicularity of a shaft,such as a stud or pin, to a datum feature establishes a cylindricaltolerance zone.
8.      The note EACH ELEMENT must beapplied to a perpendicularity feature control frame.
9.      An angularity tolerance must havea basic angular relationship to a datum.
10. The tolerance zone descriptor of a concentricity tolerance isR.
11. Concentricity is used to establish the relationship between theaxis of or more cylindrical features of an object.
12. Surface straightness can violate perfect form at MMC.
13. Geometric tolerances imply RFS unless otherwisespecified.
14. A concentricity tolerance should be used if there is a need tocontrol the axis, as in a dynamically balanced shaft. Otherwise, itis recommended that a runout or positional tolerance be used.
15. 69. A coaxial relationship can be controlled by a positionaltolerance at M with the datum reference at MMB, LMB, or RMB.
16. LMC is often used to control minimum edge distance or wallthickness.
17. True position is the theoretically exact location of afeature.
18. The datum reference frame exists in theory. The theoreticalreference frame is simulated by positioning the part on datumfeatures to adequately relate the part to the datum reference frameand to restrict motion of the part relative to the referenceframe.
19. When reference is made to the datum reference frame, theprimary datum should be given first, followed by the secondary andtertiary datums. This is referred to as datum precedence.