GD&T Practice Questions

What does GD&T stand for?

• General Dimensioning and Tolerancing

• Geometric Dimensioning and Tolerancing

• Graphical Drawing and Tolerancing

• Geometric Drawing and Technique

The main purpose of GD&T is to:

• Define material composition

• Control size, form, orientation, and location of features

• Reduce manufacturing cost only

• Eliminate all tolerances

The feature control frame in GD&T contains:

• Surface roughness symbol

• Tolerance value only

• Geometric characteristic symbol, tolerance, and datum references

• Welding symbol

In GD&T, the symbol Ø represents:

• Square feature

• Diameter

• Flatness

• Cylindricity

Which of the following is a form tolerance?

• Parallelism

• Flatness

• Position

• Concentricity

In a feature control frame, the first datum mentioned is known as the:

• Secondary datum

• Tertiary datum

• Primary datum

• Optional datum

The straightness tolerance controls:

• Form of a line

• Orientation of a plane

• Location of an axis

• Angular relationship

Flatness tolerance ensures that:

• All points on a surface lie within two parallel planes

• The surface is perpendicular to a datum

• The surface is at a given distance from a reference

• The axis of a feature remains straight

Which of the following statements about cylindricity is correct?

• It controls only circularity of a feature.

• It combines circularity and straightness along the axis.

• It applies only to flat surfaces.

• It defines the position of a cylinder.

Parallelism tolerance ensures that a surface or axis is:

• At 45° to a datum

• At right angle to a datum

• Equidistant from a datum plane

• Round in shape