Rajasthan Technical University 2010 B.Tech Mechanical Engineering Computer Aided Design - Question Paper
Rajasthan tech. University
B.tech seven sem (Main)
January 2010
Computer Aided Design
Roll No.:_-
B.TkH. (Smi. W) (Main) Emwtortow, Jmun - 2010
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Ttm#: J Hou'S] {Total Marks :
[Min. Piling Marks. 24
Attempt overall five questions selecting ona question from etch unit All questiont carry equal marks. (Schematic diagrams must be shown wherever necessary. Any data you feel missing may suitably be assumed and stated dearly. Units of quantities used / calculated must tie stated clearly).
Use ot following supporting material is permitted during examination.
(Mentioned in form No. 205)
1.'__Nil _2._____Mi)________
UNIT - I
1 (a) Define CAD. CAM and CIM. Explain with examples of application.
6
(b) What is computer graphics ? Explain raster scan display.
. 10
on
1 Explain standard algorithm such as digital ilifferential analyses (DDA) for line generation and Bresenhatn's algorithm for circle generation.
16
UNIT - II
2 (a) Explain : .
(i) Parametric and non-parametric representation of curves.
(ii)' Implicit and explicit function.
4x2
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S
(b) Derive the expreanon for a point oa a cubic b*iT curve.
OR
The co-ordinates of lour control points relative to a current WCS are given by :
*0=1** *f 'I* a *f; /*, = [J J *f. #, ={s * f Find the equation at the reeultinc Beater curve atao find points oa
thf curve for j. j. asa 1.
unit - in
Explain with parametric representation of following analytical surfaces :
(i) Ruled surface
(ii) Surface of revolution
(iii) Coons patch
(iv) Plane surface.
16
OR
(a) Show that a bicubic surface patch degenerates to a cubic spline if the four comer points of the patch are collapsed to two.
8
(b) Explain
(i) B rep and
(ii) QSG in detail. 1
8
UNIT - IV
(a) Show that the transformation of the mid-point and the mid-point transformation for a line are identical.
8
(b) A bM AB with (4] [3 2 6 1] and B = [5 S 8 l] is rotated by an ancle 30* about Y axis, followed by reflection about XY plane. Find the co-ordinates of the transformed line.
8
OR
(a) Given a point P (2, 4, 8) and using homogeneons reprm taboo :
(i) Calculate coordinates of the transformed point p* if p ia rotated about X. Y. Z axis by angles M\40v and 90~ respectively.
(ii) Calculate p if p is translated by j _j and then scaled uniformly by S = 1.5.
(iii) Find the orthographic projection Pv of p.
16
UNIT - V
Explain techniques and algorithm for hidden line and surface removal.
16
OR
(a) Explain point clipping and line clipping.
8
(b) Explain Cohen-Sutherland algorithm.
8
r f 4 6 * C
I 2500 ]
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