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Computer-Aided Design (CAD) & Simulation Flashcards

7 cards from real DMD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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

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

    MBD embeds dimensions, tolerances, annotations, and product manufacturing information directly into the 3D model, reducing reliance on separate 2D drawings.

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

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

    GD&T uses standardized symbols to precisely control geometric characteristics like flatness, perpendicularity, and true position beyond what simple size tolerances can specify.

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

    Answer: Monte Carlo simulation

    Monte Carlo simulation runs thousands of iterations with randomly sampled inputs to statistically characterize how variability and uncertainty affect output performance.

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

    Answer: Managing CAD file versions, access control, and revision history

    PDM systems control CAD file versioning, check-in/check-out workflows, access permissions, and engineering change management across organizations.

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

    Answer: How smoothly adjacent surfaces transition at their shared edges

    Continuity conditions define whether surfaces share only position (G0), tangent direction (G1), or curvature (G2) at their boundaries, controlling perceived smoothness.

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

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

    DFM analysis reviews design features such as undercuts, thin walls, and tight radii early in the design cycle to reduce manufacturing complexity and cost.

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

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

    Kinematic analysis solves for position, velocity, and acceleration of moving parts, while dynamic analysis additionally accounts for inertial forces, masses, and applied loads.