GD&T Symbols and Rules

Question 1

Which GD&T symbol is used to control the orientation of a surface relative to a datum plane without controlling its location?

Accepted Answer

Parallelism

Answer

Parallelism controls the orientation of a surface or axis to be parallel to a datum without specifying its exact location.

Question 2

What does the 'S' modifier inside a feature control frame signify?

Accepted Answer

Spherical diameter

Answer

The 'S' prefix before a diameter symbol (Sø) indicates a spherical diameter in GD&T.

Question 3

Rule #2 in ASME Y14.5 states that unless otherwise specified, each tolerance of orientation, form, location, or runout applies to which condition?

Accepted Answer

Regardless of Feature Size (RFS)

Answer

Rule #2 (RFS) is the default condition — geometric tolerances apply regardless of actual feature size unless MMC or LMC is specified.

Question 4

Which symbol in a feature control frame indicates that a tolerance applies to the full surface profile, including both sides of the tolerance zone equally?

Accepted Answer

Equal bilateral profile (no modifier)

Answer

A profile tolerance with no modifier defaults to equal bilateral disposition, split equally inside and outside the true profile.

Question 5

The 'all around' symbol on a leader line in a profile tolerance callout is represented by:

Accepted Answer

A circle at the bend of the leader line

Answer

A circle placed at the junction of the leader line and the reference line indicates that the profile tolerance applies all around the cross-section.

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

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

GD&T Symbols and Rules