GD&T Composite Feature Control 5

Question 1

In a composite profile callout, the lower-segment tolerance zone is described as a uniform-width band. This band is allowed to:

Accepted Answer

Translate and/or rotate relative to the true profile, within limits set by the upper segment

Answer

The lower-segment profile tolerance zone can translate and rotate relative to the true profile position, but it must remain entirely within the upper-segment tolerance zone.

Question 2

A designer specifies composite position with PLTZF ⌀0.5 and FRTZF ⌀0.5. What is the practical effect?

Accepted Answer

The FRTZF has no additional restraint beyond the PLTZF

Answer

When PLTZF and FRTZF have equal values, the lower segment provides no additional tightening of feature-to-feature relationships beyond what the upper segment already requires.

Question 3

Under ASME Y14.5, a composite feature control frame is distinguished from a two single-segment frame by:

Accepted Answer

The composite frame uses one geometric characteristic symbol spanning both rows

Answer

A composite frame has a single geometric characteristic symbol (e.g., position circle) that extends vertically across both rows, while a two single-segment frame repeats the symbol in each row independently.

Question 4

For a composite position callout, which statement about the FRTZF zone orientation is correct when datum A (a flat surface) is the only FRTZF datum?

Accepted Answer

The FRTZF zones must remain perpendicular to datum A but may translate in X and Y

Answer

With only datum A (primary flat surface) in the FRTZF, the zones must remain perpendicular to A (orientation locked) but can translate freely in X and Y within the PLTZF boundaries.

Question 5

A part drawing shows composite position with PLTZF ⌀0.8|A|B|C and FRTZF ⌀0.3|A|B|C. This is functionally equivalent to:

Accepted Answer

Two single-segment callouts of ⌀0.8|A|B|C and ⌀0.3|A|B|C

Answer

When all three datums appear in both segments of a composite frame, it is functionally equivalent to two single-segment position callouts because the FRTZF is fully constrained with no freedom to translate or rotate.

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

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

GD&T Composite Feature Control 5