Study Questions for Auto Cad 3 Test 2

Which of the following are valid angles of revolution for the REVOLVE command?

180 -180 360 Answer: All of the above <=====

Gizmos are not displayed in ______________________________ mode.

2D

Which of the following commands allows an object to be moved along any plane of the current UCS?

3DMOVE

Which command is active when the rotate gizmo is displayed?

3DROTATE

Which of the following commands allows an object to be rotated, moved, and scaled in one operation?

ALIGN

What is the history of a composite solid?

All of the solids used to create the composite.

Which of the following statements is true about banking?

Banking is the natural rotation of a profile on a 3D sweep path. The Bank option of the SWEEP command is used to turn banking on or off. The sweep path must be nonplanar to set banking. Answer: All of the above <===

Which option of the SWEEP command is used to change the point on the shape that will be moved along the path?

Base point

Which of the following object types can be extruded into a solid?

Circles, rectangles, and closed polylines.

When creating a model of a closed sealing ring as a loft, the ______________________________ option must be used to connect the last cross section to the first cross section.

Close surface or solid

When using the REVOLVE command, ______________________________ shapes can be revolved into solids or surfaces.

Closed

A(n) ______________________________ is a sharpening of a mesh subobject created with the MESHCREASE command.

Crease

What is the term for an angle designed into parts to allow the part to be removed from a mold?

Draft angle.

Which command is used to place a round on the edge of a solid?

FILLETEDGE

What are the subobjects of which all solid primitives are composed?

Faces, edges, and vertices.

A NURBS surface can be created with the EXTRUDE or REVOLVE command by specifying the output as a NURBS surface from within the command.

False

A normal is a vector extending parallel to a given cross section in a loft and is perpendicular to the path where the plane of the cross section intersects the path.

False

A planar surface created with the PLANESURF command can be stretched using grip editing.

False

After the SLICE command is used, the history of the solid must be reset in order to retain it.

False

Mesh models can be converted to solid models, but solid models cannot be converted to mesh models.

False

The Mesh Primitive Options dialog box is used to set the mesh parameters for the RULESURF command, among others.

False

The default smoothness level for meshes is 1.

False

The fundamental difference between a sweep and a loft is the use of guide curves in a sweep.

False

There are two basic types of 3D solids in AutoCAD: primitives and composites.

False

To create an extrusion that tapers out from the base (increases in size), enter a taper angle greater than 90°.

False

Face grips are circular; where are they located?

In the center of the face.

The ______________________________ command is used to close gaps in a mesh object.

MESHCAP

Which of the following commands is used to extrude a mesh face?

MESHEXTRUDE

Which of the following commands is used to mirror objects about any plane, regardless of the current UCS?

MIRROR3D

A surface object is created by lofting open shapes or using the ______________________________ option.

Mode

Which operations can be performed on the vertex subobjects of a solid?

Moving, rotating, and scaling.

What guides the cross-sectional shapes used in a loft?

One of the following: cross sections only, a path, guide curves.

A(n) ______________________________ shape can only be extruded into a surface.

Open

By default, how is the shape aligned with the path for the SWEEP command?

Perpendicular to the path.

When using the EXTRUDE command, a ______________________________ taper angle tapers to the inside of the object from the base.

Positive

How is a subobject selected on a solid?

Press the [Ctrl] key before picking the subobject.

When rotating a subobject, how can you cycle through the various end results produced by the operation?

Press the [Ctrl] key.

When a solid object is exploded, flat surfaces on the solid become ______________________________.

Regions

What are the three components of a 3D rectangular array?

Rows, columns, and levels.

The ______________________________ system variable controls whether or not the history of all new solids is recorded.

SOLIDHIST

To create a sweep that tapers from the beginning of the path to the end, the ______________________________ option of the SWEEP command is used.

Scale

The current subobject filter is set by picking the appropriate button in the ______________________________ panel on the Home, Solid, or Mesh tab of the ribbon.

Selection

When using the REVOLVE command, what must you do after selecting the objects to revolve?

Specify the axis of revolution

Extruding a line with the PRESSPULL command creates a(n) ______________________________.

Surface

______________________________ are the basic foundation for the smoothness of a mesh object and consist of planar shapes that fit together to form the surface.

Tessellation divisions

If the 2D Wireframe visual style is current when the 3DROTATE or 3DMOVE command is entered, what happens to the display?

The Wireframe visual style is set current for the duration of the command.

When an extrusion is created along a path, what happens to the extrusion at angled corners?

The extrusion is mitered.

Which of the rules below should be followed when using guide curves in a loft?

The guide curve should start on the first cross section. The guide curve should end on the last cross section. The guide curve should intersect all cross sections. Answer: All of the Above <===

What happens to the original solid if one of its faces is extruded?

The original is unaffected because the face is extruded into a new solid.

What is the purpose of subobject filters?

To limit the selection to the specified subobject type.

A boss is raised above the surface of an object and can serve as a seating surface for a fastener.

True

A closed shape can be extruded into a surface by specifying the output as a surface.

True

A context-sensitive panel is one only displayed in the ribbon when certain objects or subobjects are selected.

True

A helix cannot be used as a shape for a sweep, but can be used as a path for a sweep.

True

A solid extrusion has mass properties, but a surface extrusion does not.

True

An edge on a surface or solid can be selected as the sweep path.

True

By default, the profile curve used for a revolved solid is deleted after the REVOLVE command is completed.

True

By slicing a solid with a surface in the shape of a stamped part, a mating die can be created.

True

Mesh models do not have volume or mass.

True

The [Shift]+[Ctrl] key combination is used to remove a subobject from the current selection set.

True

The color of a face or edge subobject can be changed.

True

When a mesh model is created by converting a solid model or surface model, the SMOOTHMESHCONVERT system variable controls whether faces are smoothed and optimized.

True

Which of the following can be used as the axis of revolution for the REVOLVE command?

Two picked points; an object; or the X, Y, or Z axis of the current UCS.

How can you use the EXTRUDE command to extrude a face on an existing solid object?

When prompted to select objects, press the [Ctrl] key and pick the planar face on the solid.

The ______________________________ key is used to cycle through the various end results when editing a solid subobject.

[Ctrl]

Which keyboard key or key combination is used to select a subobject for editing?

[Ctrl]

When creating a mesh primitive, mesh tessellation divisions should be set ____.

before creating the mesh primitive

A(n) ______________________________ is a recess with angled sides machined into a part, centered on a hole, that allows the head of a fastener to rest below the surface of the part.

countersink

A sweep is similar to a(n) ______________________________, but there are more options when creating a sweep and the SWEEP command provides more control over the resulting object.

extrusion

The operations that can be performed with a gizmo are ____.

moving, scaling, and rotating

By default, the profile is aligned ______________________________ to the sweep path.

perpendicular

A(n) ______________________________ is a rounded exterior edge.

round

An extrusion is really a form of a(n) ______________________________, which is due to how an extrusion is created.

sweep

When the MESHSPLIT command is used:

the selected face is replaced with two faces.

A mesh consists of ____ subobjects.

vertex, edge, and face