Reg. No. :

M.E. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010

First Semester

Computer Aided Design

CD 9211 — COMPUTER APPLICATIONS IN DESIGN

(Common to M.E. CAD/CAM/M.E. Engineering Design and

M.E. Product Design and Development)

(Regulation 2009)

Time : Three hours Maximum : 100 Marks

Answer ALL questions

PART A — (10 × 2 = 20 Marks)

1. For the position vectors ]3,2[1P and ]5,4[2P determine the parametric

representation of the line segment between them.

2. What is Bernstein basis function? How does it alter the shape of a curve?

3. Explain the parametric surface with two variables and mention its advantages.

4. For a given radius and centre point write Auto LISP command to draw circle.

5. Write down the Euler-Poincare formula to verify the topology of valid solid

models.

6. What are the neutral file translators?

7. What is visual realism? List the techniques used for visual realism.

8. Name the different types of light sources.

9. What are the various types of geometric tolerances?

10. What are the various animation techniques developed to simulate the

mechanism?

Question Paper Code : 97660 4

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PART B — (5 × 16 = 80 Marks)

11. (a) What is clipping? Explain Liang-Barsky line clipping algorithm in detail

with examples. (16)

Or

(b) Explain the various types of surfaces used in a CAD model (16)

12. (a) (i) Explain a method to interface a programming language with a

typical drafting package in detail. (8)

(ii) Explain the principle of parametric modification of geometric

models. (8)

Or

(b) (i) List and explain standard tool bars available in any solid modeling

packages. (8)

(ii) Write an Auto LISP program to design and draft a solid disk type

flywheel for the given specifications.

Flexural energy : 40 Nm

Mean speed : 240 rpm

Permissible fluctuation of speed : 2%. (8)

13. (a) Write the Boolean set operations for CSG and Boundary representation

for the solid given below. (16)

Or

(b) (i) Explain IGES file structure with examples. (8)

(ii) Explain the concept of product data exchange using STEP in detail.

(8)

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14. (a) Write short notes on the following Hidden line removal algorithms.

(i) A – buffer method. (4)

(ii) BSP Tree. (4)

(iii) Octree. (4)

(iv) Ray Casting method. (4)

Or

(b) (i) Describe the various shading algorithms in detail. (8)

(ii) Explain HSV and HLS coloring models (8)

15. (a) (i) Explain the worst case arithmetic method for tolerance analysis. (8)

(ii) Discuss how the surface area is calculated using CAD software. (8)

Or

(b) (i) Describe the various ANSI from tolerances with neat diagram. (8)

(ii) What are the mating conditions for assembly? Discuss. (8)

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