ACE Cheat Sheet 2026

The 30 highest-yield ACE facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. A Civil 3D user reports that corridor models unexpectedly rebuild whenever any drawing object is modified. Which setting is MOST likely misconfigured? → Automatic rebuild is enabled in the Edit Corridor Rebuild Options dialog
2. When automating sheet set creation in AutoCAD via .NET API, which class manages the collection of sheets and subsets? → AcSmSheetSet
3. Which ACC module is specifically designed to manage RFIs and Submittals in a construction workflow? → Autodesk Build
4. Which rendering method in Autodesk 3ds Max uses photon mapping to simulate global illumination effects like caustics? → Mental Ray with photon mapping
5. When developing a Revit plugin, what class must every external command implement? → IExternalCommand
6. Which Autodesk Vault feature allows engineers to retrieve the latest version of a design file while preserving local edits? → Check Out
7. Which Autodesk software is primarily used for 3D mechanical design and simulation? → Autodesk Inventor
8. Which sampling method in V-Ray reduces noise by evaluating fewer samples in brighter, more-converged areas? → Adaptive DMC sampling
9. Which Revit API method is used to filter elements in the active document by a specific built-in category? → new FilteredElementCollector(doc).OfCategory(BuiltInCategory)
10. What is the significance of a 'watertight' or 'closed' mesh when preparing geometry for 3D printing? → It means every edge is shared by exactly two faces with no holes or open boundaries
11. In Autodesk CFD, what is the purpose of enabling 'turbulence' models such as k-epsilon? → To approximate the effects of turbulent flow without resolving every eddy
12. When integrating AutoCAD Plant 3D data with a process simulation tool, which standard XML-based format is most commonly used for plant data exchange? → PCF (Piping Component File)
13. What is the importance of Data Exchange & Interoperability in Autodesk Certified Expert? → It ensures quality, consistency, and professional standards
14. When using Autodesk Vault in a team environment, what does 'checking out' a file do? → Locks the file so other users cannot edit it simultaneously
15. When building a Revit add-in manifest (.addin file), which XML element specifies the full .NET class name that implements IExternalCommand? →
16. In AutoCAD .NET API, what is the purpose of calling transaction.GetObject() with OpenMode.ForWrite? → It opens an existing database object for modification within the transaction
17. What Revit performance technique uses a smaller, simplified version of a view to speed up navigation in large models? → Section Box to isolate a region
18. For large Revit models, which Revit setting helps reduce memory usage by unloading Revit links that are not immediately needed? → Unload Revit Links
19. Which Autodesk tool is specifically designed to help project teams perform 4D scheduling reviews by animating construction sequence? → Navisworks TimeLiner
20. How does Plugin Development & Customization improve efficiency in Autodesk Certified Expert? → By standardizing workflows and reducing rework
21. Which Autodesk Forge (now Platform Services) API service is primarily used to translate CAD files into a viewer-compatible format? → Model Derivative API
22. In AutoCAD .NET API development, what is the correct way to start a transaction for modifying database objects? → db.TransactionManager.StartTransaction()
23. How should quality be maintained in Plugin Development & Customization for Autodesk Certified Expert? → Through regular reviews, validation, and adherence to specifications
24. In Autodesk Fusion, what does 'Send to' functionality accomplish when used with Autodesk Docs? → Uploads the current design to a specified Autodesk Docs project for team access
25. In Autodesk Inventor, the 'Derive Component' feature is used to: → Reference geometry from one part file into another while maintaining associativity
26. In Autodesk Fusion 360, which command creates a solid by blending between two or more profiles on different planes? → Loft
27. What challenge is common in Plugin Development & Customization for Autodesk Certified Expert? → Compatibility issues, version control, and coordination
28. Which best practice supports Collaboration & Team Workflows in Autodesk Certified Expert? → Establishing clear procedures and following industry standards
29. In AutoCAD's .NET API, which method is used to iterate over all entities in the current model space? → BlockTableRecord.GetEnumerator() after opening the Model Space record for read
30. In a Nastran buckling analysis, what does the 'buckling load multiplier' (eigenvalue) indicate? → The factor by which the applied load must be scaled to cause buckling