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

STEP (Standard for the Exchange of Product model data) is an ISO standard neutral format specifically designed for 3D CAD data exchange across different systems.

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

Parametric modeling stores relationships between features, so changing a dimension propagates updates throughout all dependent geometry automatically.

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

FEA divides a model into small elements to compute how it responds to forces, heat, or other physical loads before a physical prototype is built.

Question 4

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

Accepted Answer

NURBS surface modeling

Answer

NURBS (Non-Uniform Rational B-Splines) provides the mathematical precision needed for smooth, class-A automotive and aerospace surface design.

Question 5

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

Accepted Answer

Establishing geometric relationships that control component position

Answer

Mates/constraints define how parts relate spatially (e.g., coincident, parallel, concentric), controlling degrees of freedom in an assembly.

DMD - Digital Manufacturing and Design Technology Certification Practice Test

DMD - Digital Manufacturing and Design Technology Certification Practice Test

DMD Computer-Aided Design (CAD) & Simulation