Hands-On AutoCAD ©2005

Chapter 14: Basic 3D CAD

Solid Models

1.
Solid models are used more frequently than surface models or wireframes because they
A)result in smaller files.
B)are more accurate.
C)can be viewed from any point in 3D space.
D)allow you to calculate mass properties.
2.
The disadvantage of solids created using pure primitive instancing is that
A)they are less accurate than solids created using cell decomposition.
B)they must be converted to another type of solid before they can be edited.
C)they are created using the B-rep format.
D)some of the parameters of the solids are not specified.
3.
By default, AutoCAD® displays all kinds of models in wireframe format. To find out which type of solid a specific model is, use the
A)ID command.
B)REGEN command.
C)LIST command.
D)MODELTYPE system variable.
4.
Spatial occupancy enumeration is rarely used in CAD applications because it
A)requires a large amount of memory.
B)is not sufficiently accurate for CAD work.
C)requires an obscure operating system.
D)does not allow 3D solids to be edited.
5.
To store and display modeling information, AutoCAD® uses
A)cell decomposition.
B)boundary representations and sweeping.
C)constructive solid geometry.
D)pure primitive instancing.
6.
All of the following are examples of solid primitives except the
A)sphere.
B)cone.
C)dome.
D)pyramid.
7.
The ISOLINES system variable specifies
A)the number of segments in a tabulated model.
B)the number of contour lines that define a solid model.
C)the direction of contour lines in a solid model.
D)the length of the segments in an extrusion.
8.
All of the following objects can be extruded except a(n)
A)arc.
B)polyline.
C)ellipse.
D)region.
9.
To create a revolved solid, use the
A)EDGESURF command.
B)REVSURF command.
C)REVOLVE command.
D)EXTRUDE command.
10.
The REVOLVE command requires, at a minimum, a(n)
A)axis of rotation and a start and end point.
B)axis of rotation and a profile.
C)profile and a planar surface parallel to the profile.
D)profile and an angle of revolution.
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