CAD 38- 44 review
By default when you create a new drawing file, the value of the z coordinate for all new 2D objects is
0 , zero
Which of the following is true?
A user coordinate system (UCS) is a user-defined construction plane in 3D space. The UCS command lets you create a new current UCS. The UCS facility helps you edit objects in 3D space.
To bevel an edge of a solid model, you should use what command
CHAMFER command.
Which of the following is an example of a visual style in AutoCAD?
Conceptual
To create accurate and properly constructed isometric circles, use the
ELLIPSE command
To give a model a hand-sketched look, which tools should you use?
Edge jitter and Edge overhang
True or False: By definition, the top surface of an extruded part has exactly the same area as the lower surface.
False
True or False: Changing to a new UCS does not affect the coordinate system icon and grid.
False
True or False: Composite solids can be broken back into their component parts using the Decurve option of the PEDIT command.
False
True or False: Creating a new solid model or surface by specifying and connecting a series of 2D cross sections is known as sweeping
False
True or False: One difference between a solid model and a surface model is that the defining geometry in a solid model defines a watertight volume
False
True or False: Only closed polylines can be extruded.
False
True or False: Perspective projection displays an object with parallel lines that do not converge toward a vanishing point.
False
True or False: Shelling a solid model consists of discarding the outer layer so that the inner parts of the model are exposed.
False
True or False: Swivel is another name for the Pan navigation mode.
False
True or False: The 3point option of the SPHERE command allows you to create a sphere that is tangent to three existing solids or surfaces.
False
True or False: The Center option of the BOX command allows you to align the lower left edge of the box with the center of an existing sphere or cylinder.
False
True or False: The DONUT command allows you to create donut-shaped solid primitives.
False
True or False: The PRESSPULL command allows you to distort the surface of a solid to create a freeform shape.
False
True or False: The SLICE command extracts a thin section from a solid model at the location you specify.
False
True or False: The UNION command does not work on composite solids.
False
True or False: The most efficient way to create a solid cone is to enter the CYLINDER command and specify a top radius of 0.
False
True or False: The most logical way to create a UCS oriented to the current drawing screen is to use the Object option.
False
True or False: To mirror an object in 3D space, you should use the 3DMIRROR command.
False
True or False: To see the effect of Boolean operations on a solid model, the most efficient view to use is generally the plan view.
False
True or False: When the 3DFORBIT command is active, the camera stays stationary and the target moves around the camera.
False
True or False: When two solid models occupy the same position in 3D space, the INTERFERENCE command returns the message "Interfering Pairs."
False
True or False:A 3D face is a type of wireframe object.
False
True or False:An elevation of 8 creates an object with a height of 8 units.
False
To create an open 3D spiral object, use the?
HELIX command.
Which command calculates the solid volume that is common to two or more overlapping solid objects?
INTERFERE
Which variable controls the number of edges in a model?
ISOLINES
A football-shaped object results when you specify
None of the above
To toggle the isometric crosshairs from one plane to another?
Press CTRL E and use the F5 key.
To set up the alignment grid to create an isometric drawing, enter the
SNAP command.
Which of the following commands is capable of creating a hole in a solid model?
SUBTRACT
To create a solid model from a surface, which command should you use?
THICKEN
To add depth to a 2D object such as a polyline or circle, which of the following commands might you use?
THICKNESS
Which of the following is false or untrue?
The origin of a UCS is fixed.
True or False: A 3DFACE creates a surface that can hold material properties.
True
True or False: A custom camera consists of a saved viewpoint in a 3D drawing.
True
True or False: A polyline that contains a crossing or self-intersecting segment cannot be extruded.
True
True or False: An important benefit of creating designs in 3D is the ability to communicate the designs more accurately to people and groups both inside and outside a company.
True
True or False: AutoCAD allows you to create a new UCS that is aligned with an existing planar object.
True
True or False: AutoCAD provides a predefined UCS for each of the six viewpoints in 3D space (top, bottom, front, back, left, and right).
True
True or False: Boolean operations in AutoCAD are derived from a mathematical system created by George Boole for use with logic formulas and operations
True
True or False: It is possible in AutoCAD to simulate the sunlight at any time of day anywhere in the world on a given calendar date.
True
True or False: It is useful to save new UCSs you create in a drawing so that you can move from one to another quickly without having to recreate them each time
True
True or False: Mirroring a 2D object in 3D space automatically creates a 3D object.
True
True or False: The Chain option of the FILLET command allows you to modify several adjoining edges in a single operation.
True
True or False: The Conceptual visual style is the same as the Gooch face style.
True
True or False: The Constrained Orbit mode of rotation limits the rotation of the model with respect to the Z axis and XY plane.
True
True or False: The PLANESURF command allows you to create a planar surface by selecting objects that form a closed area.
True
True or False: The X-ray mode views a solid model so that the interior of the model can be seen more clearly.
True
True or False: The three axes of the Cartesian coordinate system are the X, Y, and Z axes.
True
True or False: To create a hollow pipe with a 2" outer diameter and a wall thickness of 1/16", you could create concentric cylinders with diameters of 2" and 1 15/16" and then subtract the smaller cylinder from the larger one
True
True or False: To create a solid wedge, you must identify two points diagonally across from each other on the base of the wedge
True
True or False: To zoom within the 3D orbit view, right-click and pick Zoom from the shortcut menu.
True
True or False: Two points at different elevations in 3D space have different z values.
True
True or False: When AutoCAD subtracts one solid from another, it also updates the mass properties of the resulting solid.
True
True or False: When you are modifying the edge of a 3D solid, you make your selection of the subobject by pressing the CTRL key.
True
True or False: You can create a new UCS by moving the origin of the current UCS.
True
You can view a 3D model from?
any point in space.
Which of the following methods would not result in a 3D model of a cylinder?
applying the UNION command to two circles at different elevations
Which of the following cannot be extruded using the EXTRUDE command?
blocks
Which of the following is not a Boolean operation?
composition
The sections within the Dashboard are known as?
control panels
What does the INTERFERE command do
detects interference (overlap) between two or more solid objects
Typing VPOINT and pressing ENTER twice displays?
displays a "globe representation" that enables you to specify a viewpoint.
To create an elliptical cylinder, you can
enter the Elliptical option of the CYLINDER command & create an ellipse using the ELLIPSE command and then extrude it.
The icons that appear on the screen to show the position of various lights are known as
glyphs.
A line with endpoints at coordinates 0,2,2 and 0,2,5 is?
horizontal on the YZ plane.
The world coordinate system
is AutoCAD's default coordinate system & has the X axis horizontal on the screen & has the Y axis vertical on the screen.
One of the reasons that solid models are becoming more widely used than surface models is that solid models?
more accurately reflect a physical prototype.
The practice of assigning materials to objects and using visual styles, lighting, and shadows to create a photorealistic image of the model is known as
rendering.
A composite solid is one that?
results when any Boolean operation is applied to two or more solid primitives.
The purpose of the UCS icon is to?
show the orientation of the axes in the current UCS.
Which of the following is a predefined solid primitive in AutoCAD?
sphere
Moving a 2D profile along a path curve to create a 3D surface or solid model is known as?
sweeping.
You can use the PRESSPULL command to perform the same action as which of the following commands?
the EXTRUDE and SUBTRACT commands
Solid primitives are
the basic building blocks for creating complex solid models.
When defining a UCS by selecting 3 points
the first point you select becomes the origin and the other two define the X and Y axes.
An isometric drawing is a
two-dimensional drawing that gives a three-dimensional appearance.
A line with endpoints at coordinates 2,4,0 and 2,8,0 is?
vertical on the XY plane.
A representation of an object that uses lines and curves to define its boundaries is a(n)?
wireframe
