GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (Old) EXAMINATION - WINTER 2019
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Subject Code: 161903 Date: 04/12/2019
Subject Name: Computer Aided Design
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
(a) Distinguish Between Conventional Design and Computer Aided Design system with CAD architecture. [07]
(b) Enlist the various methods of geometric modeling. Discuss wire frame modeling in detail. [07]
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Q.2
(a) (1) Explain IGES graphic standard [07]
(i1) Draw and explain 2D element. [07]
(b) Using DDA algorithm, find the Pixel value position of line between points (2,10) and (6,15). [07]
OR
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(b) Write Bresenham’s line algorithm. Determine intermediate pixels for line starting from (1, 1) to (9, 6). [07]
Q.3
(a) A triangle ABC with vertices A(0,0), B(4,0) and C(2,3) is Translated through 4 and 4 units along X and Y directions respectively and then Rotated through 90° in counterclockwise direction about the new position of point C. Find: [07]
(1) The concatenated transformation matrix and
(2) The new position of triangle.
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(b) State the properties of Hermite Cubic Splines. How these curves are differing from Bezier curves? [07]
OR
(a) For AABC with coordinates A(5,5), B(8,5) and C(5,10), find new vertex position if it reflected about a line y = 2x +4. [07]
(b) What are the major advantages and applications of B-Spline curves? [07]
Q.4
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(a) Explain ruled surface, surface of revolution and tabulated surface. [07]
(b) Explain constrained based solid modeling with a neat sketch. [07]
OR
(a) Explain different types of analytical surfaces used in modeling. [07]
(b) Explain Johnson method of optimum design with an example. [07]
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Q.5
(a) Classify optimization problems on various bases. [07]
(b) A stepped shaft is as shown Fig. 1. Determine the stresses and deflections in each of the sections. Assume uniform material for the complete shaft having a modulus of elasticity as 200 GPa and axial force F as 35 KN. [07]
OR
(a) Discuss in detail about the applications of optimization in engineering. [07]
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(b) A system of springs is as shown in Fig.2. Determine the overall stiffness matrix and determine the deflections of each of the springs. [07]
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