Code No: C0401

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABADM.Tech I - Semester Examinations,October/November-2011ADVANCED CAD(CAD/CAM)Time: 3hours Max. Marks: 60Answer any five questionsAll questions carry equal marks- - -

1.a) With aneat diagram explain the working of Vector refreshdisplay system. [6]

b) Derive the equation of a cubic B-spline curve. Compare the same withthe Bezier curve.[6]

2.a) What is a Bezier Surface? Explain the Basic functions of aBezier surface. [8]

b) Compare surface modeling with solid modeling. [4]

3.a) Generate the surface having four sides with parameters u and v ifx = 3u +v andy = 2u+3v+uv withboundaries specified as follows: u = 0; 0 v 1v =0; 0 u 1u = 1; 0 v 1v = 1; 0 u 1 [8]

b) Discuss the important properties of B-spline Surfaces. [4]

4.a) What are CSG trees ?Explain their importance in the construction of the CSG solid models withexamples. [8]

b) What is collaborative design? Explain the principles of collaborative design. [4]

5. The structure consists of two bars. An axial load P = 200 kN is loaded as shown in Figure 1 below.Determine the element stiffness matrix, global stiffness matrix, global load vector, nodaldisplacements, stress in each bar andreaction forces. [12]Steel BronzeA1= 1000 mm2 A2= 2000 mm2E1= 200 GPa E2= 83 GPa

Figure 16.a) List various types of output devices and explain about any twoof them with neatdiagrams.[6]b) Briefly explain various types ofsurface manipulation techniques. [6]

7.a) Perform a 60 degree rotation of a triangle A(0,0), B(2,2) and C(6,3) about the origin and about thepoint (-1,-1). [6]b) Explain B-Representation method solid modeling with an example. [6]8. Write short notes on the following: [12]a) CAD/CAM System evaluation criteriab) STEP Architecturec) Blending and sculptured surfaces.

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