Computer-Aided Design (CAD) Important Questions | Unit-wise R23 Exam Guide
Computer-Aided Design (CAD) is one of the most essential subjects for every mechanical engineering student. It helps you understand how engineering drawings, 3D models, assemblies, and simulations are created using computer tools. In the R23 syllabus, CAD plays a major role in design-based subjects and future industrial applications. This blog provides CAD important questions, unit-wise theory and numerical/problem-solving-based questions, explained in simple exam-friendly language. These questions are designed to help students prepare faster and score more in semester exams.
This blog provides unit-wise Power Plant Engineering important questions in a simple format so students can easily prepare for mid exams, semester exams, and university finals. Every question is written in clear exam wording such as What, Explain, Describe, Define, Discuss, and numerical questions are included separately.
CAD Important Questions for R23 JNTU Students (Unit-Wise)
UNIT 1 – Introduction to CAD & Geometric Modeling
Key Theory Questions
What is CAD and how does it improve design accuracy in engineering?
Explain the basic components of a CAD system.
What is geometric modeling? Describe its importance in CAD.
Explain wireframe, surface, and solid modeling with examples.
Describe the advantages and limitations of CAD in product design.
What are the various coordinate systems used in CAD drafting?
Explain parametric modeling and its applications.
What is a CAD database? Describe its structure and purpose.
Explain the need for computer-aided drafting in industries.
Describe different types of geometric entities used in CAD.
What is feature-based modeling? Explain with examples.
Explain the difference between 2D modeling and 3D modeling.
What is the role of CAD in reverse engineering?
Explain Boolean operations used in solid modeling.
What is the importance of constraints in CAD sketches?
Describe the steps involved in creating a basic 3D model.
What are the uses of layers and blocks in CAD software?
Explain the concept of model space and paper space.
What is topology in CAD modeling?
Describe blending and chamfering operations in 3D modeling.
UNIT 2 – Transformations in CAD
Key Theory Questions
What are geometric transformations in CAD?
Explain translation transformation with examples.
Define rotation transformation and its applications.
What is scaling and why is it required in CAD?
Explain homogeneous coordinates used in CAD.
What is mirror transformation?
Describe 2D transformations vs 3D transformations.
Explain the significance of transformation matrices.
What is reflection? Give suitable engineering examples.
Describe composite transformations.
What is shearing transformation?
Explain coordinate transformation with simple steps.
Discuss the transformation pipeline in modeling.
What are rigid body transformations?
What is similarity transformation?
Explain inverse transformation with an example.
Describe scaling with respect to a fixed point.
What is rotation about an arbitrary axis?
Why do CAD systems use matrix algebra?
Explain the effect of combined transformations.
Numerical Focus Question
Perform a 2D translation of a point (4,6) by (3,2).
Apply a rotation of 90° to the point (5,0).
Scale the triangle with coordinates (1,2), (2,3), (3,1) by factor 2.
Apply mirror transformation about the Y-axis for a point (7,4).
Find the composite transformation for rotation + translation.
UNIT 3 – CAD Graphics & Visualisation
Key Theory Questions
What is computer graphics in CAD?
Explain raster and vector graphics.
Describe the working of a graphic display device.
What are display commands in CAD software?
Explain wireframe display representation.
What is shading? Describe different shading models.
Explain hidden-line and hidden-surface removal.
What is rendering in CAD visualization?
Describe the role of graphic libraries.
What is z-buffering?
Explain clipping techniques.
What is perspective projection?
Explain orthographic projection in CAD.
What is the difference between modeling and rendering?
What is the role of lighting effects in CAD?
Explain viewport creation and management.
Describe the concept of tessellation.
What is anti-aliasing?
What are polygon meshes?
Explain the process of visual realism.
UNIT 4 – Assembly Modelling & Constraints
Key Theory Questions
What is assembly modeling in CAD?
Explain different types of assembly constraints.
What is bottom-up assembly?
Describe top-down assembly and its advantages.
What is interference checking?
Explain degrees of freedom in assemblies.
What is the role of mates in assembly design?
Explain exploded views with steps.
What is collision detection in CAD assemblies?
Describe assembly modelling workflow.
What are subassemblies?
Explain constraint-based modeling.
What is design intent in assembly modeling?
Explain the significance of BOM in CAD.
What is assembly tolerance analysis?
What is the assembly tree structure?
Explain alignment and orientation constraints.
What is kinematic assembly simulation?
Describe mass property calculation.
What is the importance of assembly documentation?
UNIT 5 – CAD Applications in Engineering
Key Theory Questions
What are industrial applications of CAD?
Explain CAD in automotive design.
What is the use of CAD in aerospace industries?
Describe the role of CAD in manufacturing.
How is CAD used in product lifecycle management (PLM)?
Explain CAD in sheet metal design.
What is the use of CAD in piping design?
How does CAD help in die and mold design?
Explain CAD-based simulation tools.
What is CAE and how is it related to CAD?
Explain the role of CAD in robotics.
How is CAD used in rapid prototyping?
Describe the role of CAD in 3D printing.
What is digital twin technology?
Explain CAD’s impact on quality control.
What is model-based definition (MBD)?
Describe cloud-based CAD systems.
Explain collaborative CAD platforms.
How does CAD improve design productivity?
What is the future of CAD in engineering?
Preparation Tips for CAD
First understand the CAD interface and basic tools.
Practice 2D sketches daily to improve speed.
Solve all CAD important questions given in this blog.
Revise transformations and matrix problems regularly.
Watch simple CAD tutorials on YouTube for visualization.
Practice assembly modeling examples from real machines.
Revise projection, shading, and rendering concepts.
Create small 3D models regularly to gain confidence.
Study previous year question papers of R23.
Focus on theory + matrix transformation problems.
Conclusion
CAD is a highly scoring subject when prepared in the right way. With clear understanding, regular practice, and revising all CAD important questions, students can perform extremely well in exams. The unit-wise questions included in this blog cover all major concepts expected in the R23 syllabus. Mastering CAD not only helps in academics but also builds strong design skills needed for future mechanical engineering careers.
