GD&T Form and Orientation Tolerances 2

Question 1

Which GD&T symbol is used to control the straightness of a surface element (line element) on a cylindrical part?

Accepted Answer

Straightness (⏤)

Answer

Straightness controls individual line elements on a surface or the derived median line of a feature of size.

Question 2

A flatness tolerance zone is defined as the space between two:

Accepted Answer

Parallel planes

Answer

Flatness tolerance zone consists of two parallel planes within which the entire surface must lie.

Question 3

When angularity is applied to a surface, what is the shape of the tolerance zone?

Accepted Answer

Two parallel planes at the specified angle to the datum

Answer

Angularity applied to a surface creates a tolerance zone of two parallel planes oriented at the specified angle relative to the datum.

Question 4

Cylindricity differs from circularity in that cylindricity controls:

Accepted Answer

Both the roundness and straightness of the entire surface simultaneously

Answer

Cylindricity simultaneously controls circularity, straightness, and taper of the entire cylindrical surface in a single tolerance.

Question 5

Which statement about form tolerances and datums is correct?

Accepted Answer

Form tolerances never reference datums

Answer

Form tolerances (flatness, straightness, circularity, cylindricity) by definition control the shape of an individual feature and never require datum references.

(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test

(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test

GD&T Form and Orientation Tolerances 2