Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2161903 Computer Aided Design Previous Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2161903 Date: 12/12/2019
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.
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
(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 P 1 [1 2] and P 2 [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
(c) Derive general parametric equation for Hermits 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
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
(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
o
C. The temperature than rises to 60
o
C. Determine nodal displacement
and element stress developed.
Element 1 Element 2
Modulus of Elasticity E 72 GPa 210 GPa
Coefficient of Thermal Expansion, ?? 23 X 10
-6
per
o
C 12 X 10
-6
per
o
C
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2161903 Date: 12/12/2019
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.
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
(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 P 1 [1 2] and P 2 [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
(c) Derive general parametric equation for Hermits 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
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
(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
o
C. The temperature than rises to 60
o
C. Determine nodal displacement
and element stress developed.
Element 1 Element 2
Modulus of Elasticity E 72 GPa 210 GPa
Coefficient of Thermal Expansion, ?? 23 X 10
-6
per
o
C 12 X 10
-6
per
o
C
07
Figure 1
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
(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 mm
2
and the modulus of elasticity is 200GPa.
Determine the deflections, reactions and stresses in each of the members.
Figure : 2
07
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This post was last modified on 20 February 2020