GD&T (Geometric dimensioning and tolerancing):
Questions & Answers
Where a cylindricity tolerance is applied to a cylindrical surface, the tolerance zone
applies along the entire length of the cylinder.
a. True
b. False - ANSWERTrue
A cylindricity gauge is an instrument used to measure cylindricity deviation.
a. True
b. False - ANSWERTrue
When the feature of size is at ____________________, the surface must be perfectly
cylindrical. - ANSWERMMC
Cylindricity is the condition where all points of a circular element are equidistant
from a common axis.
a. True
b. False - ANSWERFalse
Which type of surface deviation is controlled by a cylindricity tolerance but not by a
circularity tolerance?
a. Lobing
n. Ovality
c. None of the above
d. Taper - ANSWERd
When verifying a cylindricity tolerance, the inspection method must be able to
collect a set of points and determine the:
a. Cylinder that circumscribes the set of points
b. Distance between two coaxial cylinders that contain the set of points
c. cylinder that inscribes the set of points
d. Distance between two coaxial circles that contain the set of points - ANSWERb
Where Rule # 1 applies to a cylindrical regular feature of size, the tolerance value of
a cylindricity tolerance applied to the feature of size must be ------------- the size
tolerance.
a. Greater than
b. less than
c. Equal to
d. none of the above - ANSWERb
An implied datum is an assumed plane, axis, or point from which a dimensional
measurement is made.
a. True
b. False - ANSWERTrue
, A datum is a part surface, axis, or center plane.
a. True
b. False - ANSWERFalse
The datum system constrains a part to remove some or all of the available DOF
relative to a datum reference frame.
a. True
b. False - ANSWERTrue
Datum sequence is usually communicated through feature control frames.
a. True
b. False - ANSWERTrue
Datum features should be selected based on part functional requirements.
a. True
b. False - ANSWERTrue
A datum feature is theoretical.
a. True
b. False - ANSWERFalse
A ---------- is a gage element used to establish a simulated datum
a. Datum feature simulator (physical)
b. Datum reference frame
c. Datum feature simulator (theoretical)
d. Datum feature - ANSWERa
--------- is a limit to one or more DOF.
a. Simulated Datum
b. Restraint
c. Datum Feature Simulator
d. Constraint - ANSWERd
All parts have ---- degrees of freedom.
a. 4
b. 3
c. 6
d. 9 - ANSWERc
On a part with all planar datums, what is the minimum number of points of contact
with the datum feature simulator for a tertiary plane?
a. 2
b. 1
c. None
d. 3 - ANSWERb
Questions & Answers
Where a cylindricity tolerance is applied to a cylindrical surface, the tolerance zone
applies along the entire length of the cylinder.
a. True
b. False - ANSWERTrue
A cylindricity gauge is an instrument used to measure cylindricity deviation.
a. True
b. False - ANSWERTrue
When the feature of size is at ____________________, the surface must be perfectly
cylindrical. - ANSWERMMC
Cylindricity is the condition where all points of a circular element are equidistant
from a common axis.
a. True
b. False - ANSWERFalse
Which type of surface deviation is controlled by a cylindricity tolerance but not by a
circularity tolerance?
a. Lobing
n. Ovality
c. None of the above
d. Taper - ANSWERd
When verifying a cylindricity tolerance, the inspection method must be able to
collect a set of points and determine the:
a. Cylinder that circumscribes the set of points
b. Distance between two coaxial cylinders that contain the set of points
c. cylinder that inscribes the set of points
d. Distance between two coaxial circles that contain the set of points - ANSWERb
Where Rule # 1 applies to a cylindrical regular feature of size, the tolerance value of
a cylindricity tolerance applied to the feature of size must be ------------- the size
tolerance.
a. Greater than
b. less than
c. Equal to
d. none of the above - ANSWERb
An implied datum is an assumed plane, axis, or point from which a dimensional
measurement is made.
a. True
b. False - ANSWERTrue
, A datum is a part surface, axis, or center plane.
a. True
b. False - ANSWERFalse
The datum system constrains a part to remove some or all of the available DOF
relative to a datum reference frame.
a. True
b. False - ANSWERTrue
Datum sequence is usually communicated through feature control frames.
a. True
b. False - ANSWERTrue
Datum features should be selected based on part functional requirements.
a. True
b. False - ANSWERTrue
A datum feature is theoretical.
a. True
b. False - ANSWERFalse
A ---------- is a gage element used to establish a simulated datum
a. Datum feature simulator (physical)
b. Datum reference frame
c. Datum feature simulator (theoretical)
d. Datum feature - ANSWERa
--------- is a limit to one or more DOF.
a. Simulated Datum
b. Restraint
c. Datum Feature Simulator
d. Constraint - ANSWERd
All parts have ---- degrees of freedom.
a. 4
b. 3
c. 6
d. 9 - ANSWERc
On a part with all planar datums, what is the minimum number of points of contact
with the datum feature simulator for a tertiary plane?
a. 2
b. 1
c. None
d. 3 - ANSWERb
