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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VI EXAMINATION WINTER 2018
Subject Code:X61901 Date: 16/11/2018
Subject Name: Computer Aided Design
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Differentiate conventional design and Computer Aided Design.
07

Explain DDA algorithm for line generation with flow chart.
07
Q.2

Discuss the CAD softwares giving their specific features.
07

Derive equation for the parametric representation of circle in computer graphics.
07
OR

A triangle having coordinates 25) and 35) is rotated by 30o clockwise about the vertex B. Determine the new vertex positions after rotation.
07
Q.3

Explain constructive solid geometry (CSG).
07

Write limitation of hermite cubic curve and describe the characterizes of Bezier curve.
07
OR
Q.3

Explain GKS standards.
07

Explain B-spline curve. State its advantages.
07
Q.4

Explain the steps of Finite Element analysis.
07

Explain following sketch features:
Extrude revolve sweep Loft Cut spring spiral
07
OR
Q.4

Discuss wire frame modeling.
07

A stepped shaft is shown in fig 1. Determine the stresses and the deflection in each of section using elimination approach. Assume uniform material having E=90Gpa and axial force 50 kN. A1 500 mm2 A2 400 mm2 A3 300 mm2 L1, L2, L3 600mm.
07
Q.5

Explain the following terms used in optimization.
Design Vector
Design Constraints
(iii)Objective function.
07

Discuss in detail about the applications of optimization in engineering.
07
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OR
Q.5

State various Optimization techniques. Explain any one briefly.
07

Explain the shape function in natural co-ordinate system.
07