GD&T GD&T ASME Y14.5 Standards and Drawing Interpretation

Question 1

Which standard governs GD&T practices in the United States?

Accepted Answer

ASME Y14.5

Answer

ISO 1101

Answer

MIL-STD-8C

Answer

ANSI B4.1

Question 2

What does Rule #1 (the Envelope Principle) state in ASME Y14.5?

Accepted Answer

A feature of size's surface must not violate a perfect-form envelope at MMC

Answer

All tolerances must be measured at LMC

Answer

Geometric tolerances are mandatory on every drawing

Answer

Datums must always be labeled in A-B-C order

Question 3

What is a 'feature of size' as defined by ASME Y14.5?

Accepted Answer

A feature with directly opposed elements — such as a cylinder, hole, or two parallel surfaces — definable by a single size dimension

Answer

Any feature drawn on an engineering print

Answer

A surface that has a datum callout

Answer

A feature controlled exclusively by profile tolerance

Question 4

What does ASME Y14.5 Rule #2 establish?

Accepted Answer

Unless otherwise specified, all geometric tolerances apply at RFS (Regardless of Feature Size)

Answer

Perfect form is required at LMC

Answer

Datum references are mandatory for all tolerances

Answer

Basic dimensions must appear in rectangular boxes

Question 5

What major new symbol was introduced in the ASME Y14.5-2018 revision?

Accepted Answer

The Independent modifier (encircled I), which overrides Rule #1 for a specific feature

Answer

The Free State modifier

Answer

The Projected Tolerance Zone symbol

Answer

The Tangent Plane modifier

Question 6

Under ASME Y14.5, what is the default geometric tolerance condition when no modifier is shown?

Accepted Answer

Regardless of Feature Size (RFS)

Answer

Maximum Material Condition (MMC)

Answer

Least Material Condition (LMC)

Answer

Free State