GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
--- Content provided by FirstRanker.com ---
Subject Code: 2161903 Date: 12/12/2019
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.
--- Content provided by FirstRanker.com ---
MARKS
Q.1 (a) State the various stages for a design process, in which various CAD tools can be used to improve productivity. 03
(b) Determine the pixels for a straight line connecting two points (19, 38) and (38, 52) using DDA algorithm. 04
--- Content provided by FirstRanker.com ---
(c) Enlist different commercial CAD software available and explain the features of any two CAD software in detail. 07
Q.2 (a) For the position vectors P1 [1 2] and P2 [4 3], determine the parametric representation of line segment between them. Also determine the slope and tangent vector of line segment. 03
(b) Explain analytic curves and synthetic curves with example. 04
(c) Short note: Graphic exchange standard. 07
OR
--- Content provided by FirstRanker.com ---
(c) Derive general parametric equation for Hermite cubic spline curve in matrix form. 07
Q.3 (a) Derive vector equation of line in parametric form 03
(b) Differentiate between wireframe modeling and solid modeling technique. 04
(c) Compare CSG and B-rep techniques of solid modeling. 07
OR
--- Content provided by FirstRanker.com ---
Q.3 (a) Write limitations of a wire frame model. 03
(b) With example clearly define the term topology as used in modeling 04
(c) A polygon having vertices A (-2,0), B (0,-1), C (2,0) and D (0,1) is to be reflected about line Y = 0.5X + 1. Find the vertices of polygon. 07
Q.4 (a) What is geometric transformation? Explain any one in detail. 03
(b) What are homogeneous coordinate systems? Write the matrix transformation in homogeneous form for clockwise rotation about origin 04
--- Content provided by FirstRanker.com ---
(c) Explain Projections of geometric models. 07
OR
Q.4 (a) Write engineering application of Finite Element Analysis 03
(b) Explain windows to viewport transformation 04
(c) A load member is as shown in Figure 1. The loading is initially done at 20°C. The temperature than rises to 60°C. Determine nodal displacement and element stress developed. 07
--- Content provided by FirstRanker.com ---
Element 1 Element 2
Modulus of Elasticity E 72 GPa 210 GPa
Coefficient of Thermal Expansion, a | 23 X 10-6 per °C | 12 X 10-6 per °C
Figure 1
--- Content provided by FirstRanker.com ---
Q.5 (a) Explain potential energy equation, used in FEA 03
(b) Write general procedure for FEA 04
(c) Derive equation of global stiffness matrix for 1D linear element considering thermal effect. 07
OR
Q.5 (a) Explain CST element defects 03
--- Content provided by FirstRanker.com ---
(b) Explain types of elements used in FEM 04
(c) A two member truss is as shown in Figure 2. The cross sectional area of each member is 200 mm² and the modulus of elasticity is 200GPa. Determine the deflections, reactions and stresses in each of the members. 07
Figure 2
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---