DMD Computer-Aided Design (CAD) & Simulation 3

Question 1

What is Model-Based Definition (MBD) in modern digital manufacturing?

Accepted Answer

Embedding all product definition data including GD&T directly in the 3D CAD model

Answer

A method for building physical scale models for testing

Answer

A framework for classifying CAD models in a PDM system

Answer

A process for converting 2D drawings into 3D solid models

Question 2

What capability does Geometric Dimensioning and Tolerancing (GD&T) provide that basic plus/minus tolerancing cannot?

Accepted Answer

Complete control over feature form, orientation, location, and runout

Answer

Larger allowable tolerances for reduced manufacturing cost

Answer

Automatic tolerance calculation by the CAD software

Answer

Color-coded tolerance zones for visual inspection

Question 3

Which simulation approach uses random sampling to statistically assess how design variations affect product performance?

Accepted Answer

Monte Carlo simulation

Answer

Linear static analysis

Answer

Eigenvalue analysis

Answer

Fatigue life prediction

Question 4

What is the main function of Product Data Management (PDM) software in a CAD environment?

Accepted Answer

Managing CAD file versions, access control, and revision history

Answer

Running FEA and CFD simulations on stored models

Answer

Converting between different CAD file formats automatically

Answer

Generating photorealistic product images for marketing use

Question 5

In CAD surface modeling, what do continuity conditions G0, G1, and G2 control?

Accepted Answer

How smoothly adjacent surfaces transition at their shared edges

Answer

The material grain direction assigned to a surface

Answer

The display tessellation resolution for curved surfaces

Answer

Manufacturing tolerances for machined surface finishes

Question 6

What is 'Design for Manufacturability' (DFM) analysis in the CAD design process?

Accepted Answer

Reviewing a design early to identify features that are difficult or costly to manufacture

Answer

Evaluating a design's aesthetic appeal before committing to production tooling

Answer

Calculating the strength of a design under its expected service loads

Answer

Generating the bill of materials automatically from a 3D assembly model

Question 7

In dynamic simulation of mechanisms, what distinguishes a 'kinematic' analysis from a 'dynamic' analysis?

Accepted Answer

Kinematic analyzes motion without forces; dynamic includes forces, masses, and inertia

Answer

Kinematic uses FEA elements while dynamic uses CFD equations

Answer

Kinematic applies to fluid systems; dynamic applies to solid structures

Answer

Kinematic is used for single parts; dynamic is used for multi-body assemblies