DMD Computer-Aided Design (CAD) & Simulation

Question 1

Which neutral file format is most widely used for exchanging 3D CAD geometry between different software platforms?

Accepted Answer

STEP

Answer

DWG

Answer

STL

Answer

PDF

Question 2

In parametric CAD modeling, what happens when a base dimension is changed?

Accepted Answer

All dependent features automatically update to reflect the change

Answer

The entire model must be rebuilt from scratch

Answer

Only the changed feature updates while others remain fixed

Answer

The model is converted to a static mesh

Question 3

What is the primary purpose of Finite Element Analysis (FEA) in product development?

Accepted Answer

Predicting structural behavior under applied loads and conditions

Answer

Generating tool paths for CNC machining

Answer

Creating photorealistic product renderings

Answer

Automating the drafting of engineering drawings

Question 4

Which modeling technique is most suitable for creating complex, aerodynamic surfaces in automotive or aerospace design?

Accepted Answer

NURBS surface modeling

Answer

Boolean solid modeling

Answer

Constructive Solid Geometry (CSG)

Answer

Polygon mesh modeling

Question 5

In assembly modeling, what is a 'mate' or 'assembly constraint' used for?

Accepted Answer

Establishing geometric relationships that control component position

Answer

Setting the material properties of components

Answer

Defining dimensional tolerances on a part

Answer

Assigning colors and appearances to parts

Question 6

What does Computational Fluid Dynamics (CFD) simulation primarily analyze?

Accepted Answer

The flow behavior of liquids and gases around or through objects

Answer

The electrical properties of circuit boards

Answer

The kinematic motion of mechanical linkages

Answer

The thermal expansion of solid materials

Question 7

In the context of CAD modeling, what is 'design intent'?

Accepted Answer

The underlying logic, relationships, and reasoning embedded in how a model is constructed

Answer

The manufacturing cost target for a product

Answer

The final approval signature on engineering drawings

Answer

The copyright notice attached to a CAD file