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

    Answer: STEP

    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.

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

    Answer: All dependent features automatically update to reflect the change

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

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

    Answer: Predicting structural behavior under applied loads and conditions

    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.

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

    Answer: NURBS surface modeling

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

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

    Answer: Establishing geometric relationships that control component position

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

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

    Answer: The flow behavior of liquids and gases around or through objects

    CFD solves fluid flow equations numerically to predict pressure, velocity, and temperature distributions in and around fluid systems.

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

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

    Design intent captures the engineer's logic through parameters, constraints, and feature order so the model behaves predictably when modifications are made.