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

The sketch has the maximum number of elements allowed

Answer

The sketch has been approved by an engineer

Answer

All elements are locked with Fix constraints

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

Forces two lines to be parallel but offset

Answer

Makes two lines equal in length

Answer

Aligns two line endpoints to the same point

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 locks size; Coincident locks position

Answer

Concentric applies to 3D features; Coincident applies only to 2D sketches

Answer

They are functionally identical in all CAD systems

Question 4

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

Accepted Answer

Blue

Answer

Black

Answer

Red

Answer

Yellow

Question 5

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

Accepted Answer

Equal

Answer

Concentric

Answer

Tangent

Answer

Fix

Question 6

What is the 'Pierce' constraint used for in CAD sketching?

Accepted Answer

Forces a sketch point to coincide with where a 3D edge or curve pierces the sketch plane

Answer

Makes a line cut through an arc at its midpoint

Answer

Locks a sketch element through the origin

Answer

Forces two curves to intersect at a specific angle

Question 7

What is the purpose of a 'Smooth (G2)' or 'Curvature Continuous' constraint between two splines or curves?

Accepted Answer

Ensures the curves meet with matching tangent direction and matching curvature, producing a visually seamless blend

Answer

Ensures the curves are the same length

Answer

Forces the curves to be parallel

Answer

Locks the endpoint of one spline to the other