CAD Geometric Constraints 3

Question 1

What does 'fully constrained' mean for a CAD sketch?

Accepted Answer

Every element has zero remaining degrees of freedom and cannot move

Answer

A fully constrained sketch has no remaining degrees of freedom — every element's position, size, and orientation are completely defined by constraints and dimensions.

Question 2

What is a 'Collinear' constraint used for in a CAD sketch?

Accepted Answer

Forces two or more lines to lie along the same infinite line

Answer

A Collinear constraint forces two or more line segments to share the same infinite line direction and position, meaning they all lie on the same line.

Question 3

How does a 'Concentric' constraint differ from a 'Coincident' constraint?

Accepted Answer

Concentric applies only to circles and arcs sharing a center; Coincident applies to any two points sharing a location

Answer

Concentric is specifically for circles/arcs sharing a center point, while Coincident is a general-purpose point-to-point (or point-to-curve) constraint.

Question 4

In most CAD software, under-constrained sketch elements are typically displayed in which color?

Accepted Answer

Blue

Answer

Under-constrained (under-defined) sketch elements are typically shown in blue in software like SolidWorks and Inventor, indicating they still have free degrees of motion.

Question 5

Which constraint would you apply to ensure two arcs always maintain the same radius?

Accepted Answer

Equal

Answer

An Equal constraint applied to two arcs forces them to maintain identical radii, so changing one automatically updates the other.

CAD - Computer-Aided Design Practice Test

CAD - Computer-Aided Design Practice Test

CAD Geometric Constraints 3