ACE Complex Design, Modeling & Simulation Techniques 3 — Questions and Answers
Question 1: In Autodesk Fusion 360, which command creates a solid by blending between two or more profiles on different planes?
- Extrude
- Revolve
- Loft (Correct answer)
- Mirror
Correct answer: Loft
The Loft command transitions smoothly between multiple cross-sectional profiles to form a solid or surface.
Question 2: When setting up a thermal simulation in Autodesk Simulation, which boundary condition represents heat loss from a surface to the surrounding air via natural convection?
- Prescribed temperature
- Convection coefficient (Correct answer)
- Radiation emissivity
- Internal heat generation
Correct answer: Convection coefficient
A convection boundary condition applies a film coefficient and ambient temperature to model heat transfer between the surface and surrounding fluid.
Question 3: In Inventor's parametric modeling, what is the difference between a 'driven' and a 'driving' dimension?
- Driven dimensions control sketch geometry; driving ones are reference only
- Driving dimensions control geometry; driven dimensions are reference values computed from geometry (Correct answer)
- There is no difference; the terms are interchangeable
- Driven dimensions apply only to 3D features
Correct answer: Driving dimensions control geometry; driven dimensions are reference values computed from geometry
Driving dimensions constrain and control sketch geometry, while driven (reference) dimensions simply report the current value without controlling it.
Question 4: Which Autodesk Nastran element type is best suited for modeling thin-walled sheet metal structures?
- Solid (hex) elements
- Beam elements
- Shell elements (Correct answer)
- Spring elements
Correct answer: Shell elements
Shell elements efficiently capture bending and membrane behavior in thin-walled structures without requiring multiple layers of solid elements through the thickness.
Question 5: In Autodesk AutoCAD, what does the 'XREF Bind' operation do?
- Attaches an external reference to the current drawing
- Permanently incorporates all named objects from an xref into the host drawing (Correct answer)
- Detaches an external reference without deleting content
- Reloads an updated external reference file
Correct answer: Permanently incorporates all named objects from an xref into the host drawing
Bind merges the xref and all its dependent named objects (layers, blocks, etc.) permanently into the host drawing as local definitions.
Question 6: In a Fusion 360 simulation study, what is the significance of the 'Safety Factor' result plot?
- It shows areas where the mesh is too coarse
- It shows the ratio of material yield strength to applied Von Mises stress (Correct answer)
- It identifies regions with maximum displacement
- It calculates the resonant frequency of the part
Correct answer: It shows the ratio of material yield strength to applied Von Mises stress
The Safety Factor plot divides material yield strength by the local Von Mises stress, highlighting regions at risk of plastic deformation.
Question 7: What does the 'Freeze' option do when applied to a solid body in Autodesk Fusion 360?
- Locks the body's position in the assembly
- Excludes the body from timeline regeneration to speed up computations (Correct answer)
- Converts the body to a surface
- Applies a material property that prevents editing
Correct answer: Excludes the body from timeline regeneration to speed up computations
Freezing a body removes it from the parametric timeline update cycle, significantly reducing regeneration time for complex models.
ACE Complex Design, Modeling & Simulation Techniques 3
In Autodesk Fusion 360, which command creates a solid by blending between two or more profiles on different planes?