ANNA UNIVERSITY-CHENNAI
REGULATION 2013
ME6501-COMPUTER AIDED DESIGN
TWO MARKS QUESTIONS WITH ANSWERS
UNIT-2
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1.Write down the advantages of surface modeling.
1. Surface modeling can be used to check the real look of the product with coloring and shading.
2. Surface modeling can be used to perform interference checking.
3. As the surface models precisely define the part geometry such as surface and boundaries, they can help to produce machine instructions automatically.
4. Complex surface features can be created very easily.
5. Un ambiguities in the interpretation of object is less than wire frame models by using the provision of hidden line removal.
1. Surface modeling can be used to check the real look of the product with coloring and shading.
2. Surface modeling can be used to perform interference checking.
3. As the surface models precisely define the part geometry such as surface and boundaries, they can help to produce machine instructions automatically.
4. Complex surface features can be created very easily.
5. Un ambiguities in the interpretation of object is less than wire frame models by using the provision of hidden line removal.
2.What is CGS?
Constructive solid geometry (CSG) is a method used in solid modeling for creating 3D models in CAD. Constructive solid geometry permits a modeler to make a complex surface by applying Boolean operators to join objects. Frequently CSG presents a model/surface that appears visually complex, but is essentially little more than cleverly combined.
Constructive solid geometry (CSG) is a method used in solid modeling for creating 3D models in CAD. Constructive solid geometry permits a modeler to make a complex surface by applying Boolean operators to join objects. Frequently CSG presents a model/surface that appears visually complex, but is essentially little more than cleverly combined.
3.Write down two important solid modeling technique.
The solid modeling techniques permit for the automation of some complicated engineering calculations that are approved as a part of the design progression. Simulation, planning, and confirmation of processes such as machining and assembly were one of the initiations for the
development of solid modeling technique.
The solid modeling techniques permit for the automation of some complicated engineering calculations that are approved as a part of the design progression. Simulation, planning, and confirmation of processes such as machining and assembly were one of the initiations for the
development of solid modeling technique.
4.Write down ‘Free form surface’.
Freeform surface is used in CAD and other computer graphics software to describe the skin of a 3D geometric element. Freeform surfaces do not have rigid radial dimensions, unlike regular surfaces such as planes, cylinders and conic surfaces.
Freeform surface is used in CAD and other computer graphics software to describe the skin of a 3D geometric element. Freeform surfaces do not have rigid radial dimensions, unlike regular surfaces such as planes, cylinders and conic surfaces.
5.Define ‘focus’ of a curve.
In geometry, the focus is pair of special points with reference to which any of a variety of curves is constructed.
In geometry, the focus is pair of special points with reference to which any of a variety of curves is constructed.
6. Write a short note ‘Hermite curve’.
A Hermite curve is a spline where every piece is a third degree polynomial defined in Hermite form: that is, by its values and initial derivatives at the end points of the equivalent domain interval.
A Hermite curve is a spline where every piece is a third degree polynomial defined in Hermite form: that is, by its values and initial derivatives at the end points of the equivalent domain interval.
7.Define Conic section.
A conic section is a curve created as the intersection of a cone with a plane. In analytic geometry, a conic may be described as a plane algebraic curve of degree two, and as a quadric of dimension two.
A conic section is a curve created as the intersection of a cone with a plane. In analytic geometry, a conic may be described as a plane algebraic curve of degree two, and as a quadric of dimension two.
8.Write down the eccentricity value for ellipse, parabola and hyperbola.
The value of eccentricity less than one is ellipses, those with eccentricity equal to one are parabolas, and those with eccentricity greater than one is hyperbolas.
9.Define Quadratic Bezier curve.
As shown in the figure, a quadratic Bezier curve is the path defined by the function B(t), given
points P0, P1, and P2,B(t)={(1-t) (1-t)P0=tp1=t(1-t)p1=tp2}
points P0, P1, and P2,B(t)={(1-t) (1-t)P0=tp1=t(1-t)p1=tp2}
10.List out properties of B-Spline.
i. The maximum order in every parametric direction is limited to the number of describing polygon vertices in that path.
ii. The surface is changeable to an affine transformation.
iii. The deviation diminishing property of B-spline surface is not well recognized.
iv. The control of any polygon net vertex is limited to ±p/2, ±q/2 spans in the particular parametric direction.
v. If the number of polygon net vertices is equal to the order of basis in that dire.
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i. The maximum order in every parametric direction is limited to the number of describing polygon vertices in that path.
ii. The surface is changeable to an affine transformation.
iii. The deviation diminishing property of B-spline surface is not well recognized.
iv. The control of any polygon net vertex is limited to ±p/2, ±q/2 spans in the particular parametric direction.
v. If the number of polygon net vertices is equal to the order of basis in that dire.
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For all units of CAD and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com
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