Engineering Graphics - Lecture 1, 2A, 2B
Select the answers (one or more) that best match the descriptions of Figures a) and b) below.
- Figure a) is the symbol for third angle projections and Figure b) is the symbol for first angle projections. - Both Figure a) and Figure b) show the front and right side views of a cone.
Symmetry/Center lines are used to:
- Show location of the center point of circular holes or patterns. - Show path of motion. - Show the axis of symmetry of shafts and other cylindrical members.
In the following drawing, "x" marks the direction of sight of the front view. How many views should be sketched to fully represent the object using orthographic multiview projections? What views should these be?
- Three views, front, top and left side, are sufficient and necessary. - Three views, front, top and right side, are sufficient and necessary.
In the following drawing, "x" marks the direction of sight of the front view. How many views should be sketched to fully represent the object using orthographic multiview projections? What views should these be?
- Three views, the front, top and left side views, are sufficient and necessary. - Three views, the front, top and right side views, are sufficient and necessary.
Select the alternative that best matches the top view of the object below.
Alternative a)
Select the alternative that best matches the front view of the object shown below.
Alternative d)
Select the alternative that best matches the top view of the object shown below.
B (no middle lines)
Select the arrows that point to the front of the object.
D, and E only.
________ lines represent features that are hidden behind other surfaces.
Dash
First angle projections place the object in the third quadrant of a conventionally adopted coordinate system.
False
Orthographic multiview projections show objects in three-dimensional (solid) form, from the point of view that shows most object details.
False
Symmetry or center lines have precedence over hidden lines. This means that when both symmetry/center and hidden lines occupy the same location, the symmetry/center line is sketched, and the hidden line is not sketched.
False
Symmetry or center lines have precedence over visible lines. This means that when both symmetry/center and visible lines occupy the same location, the symmetry/center line is sketched, and the visible line is not sketched.
False
Third angle projections place the object in the first quadrant of a conventionally adopted coordinate system.
False
When drafting mutiviews, the top, front and side views are always sketched.
False
Symmetry/Center lines are:
Light dashed lines that are made of alternating long and short dashes.
_______ lines represent features that are in the direct sight of the viewer in orthographic multiview projections.
Solid
Miter lines are inclined at 45 degrees to the horizontal, and are used to sketch a third view form two views that are adjacent to each other.
True
Orthographic multiview projections are geometric representations of the faces of an object showing visible and invisible edges.
True
The orthographic multiview projections of an object should show all object profiles and all object features visible on at least one view.
True
Visible lines have precedence over hidden lines. This means that when both visible and hidden lines occupy the same location, the visible line is sketched, and the hidden line is not sketched.
True
In the following drawing, "x" marks the direction of sight of the front view. How many views should be sketched to fully represent the object using orthographic multiview projections? What views should these be?
Two views are necessary and sufficient. The views should be the front and top views.
In the following drawing, "x" marks the direction of sight of the front view. How many views should be sketched to fully represent the object using orthographic multiview projections? What views should these be?
Two views, the front and the top, are sufficient and necessary.
Are the front, top and right side views correct?
Yes. They are correct.
