Hands-On AutoCAD ©2005

Chapter 14: Basic 3D CAD

Surface Models

1.
Surface models are considered to be more advanced than wireframe models because
A)they can be used to calculate mass properties.
B)they have surfaces (faces).
C)they have volume.
D)they can be used to calculate holding properties and weights.
2.
An analytic surface is one that
A)is described by an equation or set of equations.
B)is formed from a set of data points that are used as control points.
C)interpolates the input data, allowing control of individual data points.
D)is created using a minimum of four curves that have adjoining edges.
3.
Surface models are used mostly in
A)modeling mechanical parts.
B)creating architectural models.
C)modeling complex electrical systems.
D)modeling complex curves in boat hulls and car fenders.
4.
The number of segments in a tabulated surface is controlled by the
A)SURFTAB1 system variable.
B)SURFTAB2 system variable.
C)SURFTYPE system variable.
D)EDGESURF command.
5.
A fillet surface is used to
A)reshape a bicubic Coons patch with smooth curves.
B)round the edges of a planar surface.
C)blend two surfaces together.
D)convert facets into smooth curves.
6.
A surface primitive is a(n)
A)basic 3D object that can be used to create more advanced models.
B)wireframe model from which surface models can be created.
C)2D object that can be extruded to form a surface model.
D)analytic surface from which nonanalytic surfaces can be created.
7.
All of the following are surface primitives except the
A)box.
B)cone.
C)spiral.
D)dish.
8.
To create an approximation of a Coons patch in AutoCAD®, use the
A)3DMESH command.
B)REVSURF command.
C)TABSURF command.
D)EDGESURF command.
9.
The Spline option of the PEDIT command
A)creates an arc-fit polyline joining each pair of vertices to convert a straight-line polyline into a curve.
B)uses the vertices of the polyline as control points to create a curve approximating a B-spline.
C)generates the linetype in a continuous pattern through the vertices of the polyline.
D)smoothes a polygon mesh surface.
10.
To control the type of surface created using the Smooth surface option of the PEDIT command, use the
A)SURFTAB1 system variable.
B)SURFTAB2 system variable.
C)SURFTYPE system variable.
D)EDGESURF command.
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