GD&T (Geometric dimensioning and tolerancing):
Questions & Answers
Which of the following represents the type of fit for a hole and shaft pair given that
a. Interference Fit
b. Clearance Fit
c. Loose Fit
d. Transition Fit - ANSWERa
In a shaft basis system, the upper deviation (tolerance limit) of the size of shaft is
a. Not related to size
b. Zero
c. less than zero
d. 1 - ANSWERb
What is the definition of datum?
a. A theoretically exact plane, point or axis from which a dimension is measured.
b. A part feature that contacts a datum
c. A set of three mutually perpendicular planes. - ANSWERa
Regardless of feature size is ...... (select all that apply)
a. is implied on all geometric tolerances, unless indicated otherwise
b. is never implied.
c. size indicates a geometric tolerance that applies at any increment of the size of the
feature within its permissible limits
d. doesn't have a symbol - ANSWERa, c, d
Flatness tolerance does not require a datum.
a. True
d. False - ANSWERTrue
The tolerance zone for a flatness tolerance is the space between two perpendicular
planes.
a. True
b. False - ANSWERFalse
If a flatness tolerance is applied to a surface, the high and low points of the surface
must be within the tolerance zone.
a. True
b. False - ANSWERTrue
A dial indicator, also known as a dial gage and probe indicator, is an instrument used
to accurately measure small linear distances, and is frequently used in inspection of
parts.
a. True
b. False - ANSWERTrue
, ____________________ is the condition of a surface or a derived median plane
having all of its elements in one plane.
a. Cylindrical
b. Flatness
c. Straightness
d. Circular - ANSWERb
A(n) ____________________ is an imperfect plane formed by the center points of all
line segments bounded by the feature of size.
a. warping
b. derived median plane
c. regardless of feature size
d. flatness tolerance - ANSWERb
A(n) ____________________ is a solid, flat plate used as the main horizontal
reference plane for precision inspection and tooling setup. - ANSWERSurface plate
A straightness tolerance is a geometric tolerance that defines the straightness
deviation permitted on individual surface elements or on a derived median line.
a. True
b. False - ANSWERTrue
Where the feature of size is at ____________________, the derived median line of
the feature of size must be perfectly straight.
a. LMC
b. RFS
c. MMC
d. derived median plane - ANSWERc
Where a straightness tolerance is applied to surface elements that are associated
with a size dimension, and Rule #1 applies to the size dimension, the straightness
tolerance value must be --------- the size tolerance.
a. greater than
b. less than
c. equal to - ANSWERb
A(n) ____________________ is an instrument used to measure roundness deviation.
- ANSWERRoundness gage
A(n) ____________________ is a device that applies the use of optics to measure
part geometry. - ANSWERProfile Projector
A circularity tolerance is always applied to surface elements of a surface of
revolution.
a. True
b. False - ANSWERTrue
Questions & Answers
Which of the following represents the type of fit for a hole and shaft pair given that
a. Interference Fit
b. Clearance Fit
c. Loose Fit
d. Transition Fit - ANSWERa
In a shaft basis system, the upper deviation (tolerance limit) of the size of shaft is
a. Not related to size
b. Zero
c. less than zero
d. 1 - ANSWERb
What is the definition of datum?
a. A theoretically exact plane, point or axis from which a dimension is measured.
b. A part feature that contacts a datum
c. A set of three mutually perpendicular planes. - ANSWERa
Regardless of feature size is ...... (select all that apply)
a. is implied on all geometric tolerances, unless indicated otherwise
b. is never implied.
c. size indicates a geometric tolerance that applies at any increment of the size of the
feature within its permissible limits
d. doesn't have a symbol - ANSWERa, c, d
Flatness tolerance does not require a datum.
a. True
d. False - ANSWERTrue
The tolerance zone for a flatness tolerance is the space between two perpendicular
planes.
a. True
b. False - ANSWERFalse
If a flatness tolerance is applied to a surface, the high and low points of the surface
must be within the tolerance zone.
a. True
b. False - ANSWERTrue
A dial indicator, also known as a dial gage and probe indicator, is an instrument used
to accurately measure small linear distances, and is frequently used in inspection of
parts.
a. True
b. False - ANSWERTrue
, ____________________ is the condition of a surface or a derived median plane
having all of its elements in one plane.
a. Cylindrical
b. Flatness
c. Straightness
d. Circular - ANSWERb
A(n) ____________________ is an imperfect plane formed by the center points of all
line segments bounded by the feature of size.
a. warping
b. derived median plane
c. regardless of feature size
d. flatness tolerance - ANSWERb
A(n) ____________________ is a solid, flat plate used as the main horizontal
reference plane for precision inspection and tooling setup. - ANSWERSurface plate
A straightness tolerance is a geometric tolerance that defines the straightness
deviation permitted on individual surface elements or on a derived median line.
a. True
b. False - ANSWERTrue
Where the feature of size is at ____________________, the derived median line of
the feature of size must be perfectly straight.
a. LMC
b. RFS
c. MMC
d. derived median plane - ANSWERc
Where a straightness tolerance is applied to surface elements that are associated
with a size dimension, and Rule #1 applies to the size dimension, the straightness
tolerance value must be --------- the size tolerance.
a. greater than
b. less than
c. equal to - ANSWERb
A(n) ____________________ is an instrument used to measure roundness deviation.
- ANSWERRoundness gage
A(n) ____________________ is a device that applies the use of optics to measure
part geometry. - ANSWERProfile Projector
A circularity tolerance is always applied to surface elements of a surface of
revolution.
a. True
b. False - ANSWERTrue
