Gd and T
Circle T if the statement is true. Circle F if the statement is
false.
1. The MMB and LMB symbols are only
used if the datum feature has size RMB is implied if the datum
feature has size and no boundary symbol is used. No material
boundary symbol can be used if a feature does not have size.
2. Unit straightness can be used if
the part must be controlled per unit of measure as well as over the
total length.
3. Specific area flatness should be
avoided on very large parts
4. Circularity is a profile
tolerance.
5. Cylindricity is identified by a
radius tolerance zone that establishes two perfect concentric
cylinders.
6. A parallelism tolerance zone must
be 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 cylindrical
tolerance zone.
8. The note EACH ELEMENT must be
applied to a perpendicularity feature control frame.
9. An angularity tolerance must have
a basic angular relationship to a datum.
10. The tolerance zone descriptor of a concentricity
tolerance is R.
11. Concentricity is used to establish the relationship
between the axis of or more cylindrical features of an
object.
12. Surface straightness can violate perfect form at
MMC.
13. Geometric tolerances imply RFS unless otherwise
specified.
14. A concentricity tolerance should be used if there is a
need to control the axis, as in a dynamically balanced shaft.
Otherwise, it is recommended that a runout or positional tolerance
be used.
15. 69. A coaxial relationship can be controlled by a
positional tolerance at M with the datum reference at MMB, LMB, or
RMB.
16. LMC is often used to control minimum edge distance or
wall thickness.
17. True position is the theoretically exact location of a
feature.
18. The datum reference frame exists in theory. The
theoretical reference frame is simulated by positioning the part on
datum features to adequately relate the part to the datum reference
frame and to restrict motion of the part relative to the reference
frame.
19. When reference is made to the datum reference frame, the
primary datum should be given first, followed by the secondary and
tertiary datums. This is referred to as datum precedence.
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