ENME 1781 Final Exam Review with 100- correct answers 2024.
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Course
ENME
Institution
ENME
Projection Technique
Principles used to graphically represent 3D objects and structures on 2D.
Line of Sight
Imaginary ray of light between eye and object.
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ENME 1781 Final Exam Review with 100%
correct answers 2024
Projection Technique - ANSWER-Principles used to graphically represent 3D objects and structures on 2D.
Line of Sight - ANSWER-Imaginary ray of light between eye and object.
Plane of Projection - ANSWER-Imaginary flat plane upon which the image created by lines of sight is projected.
Which projection technique is employed in the US? What is the respective view arrangement? - ANSWER-Third Angle Projection. Top
Rear Left Front Right Bottom
(Like multiview drawings-right is on the right side of the front view and the left is on the left side of the front view)
Round - ANSWER-Rounded exterior corner. Used to eliminate sharp corners.
Fillet - ANSWER-Rounded interior corner. Used to eliminate sharp corners.
Chamfer - ANSWER-A beveled corner used on the openings of holes and on the ends of cylindrical parts to eliminate sharp edges.
Perspective Projection - ANSWER-Projection lines are not parallel to each other. Object is theoretically located at a finite position and viewed from a single point.
Parallel Projection - ANSWER-Projection lines are parallel to each other. Object is theoretically positioned at infinity.
Oblique (3D) Projection - ANSWER-Parallel lines of sight at an angle
to projection plane.
Orthographic Projection - ANSWER-Parallel lines of sight perpendicular to projection plane.
Axonometric (3D) Projection - ANSWER-Pictorial drawing of an object created by rotating the object on an axis relative to a projection plane. Only one view is required to define the object.
Isometric Projection - ANSWER-Isometric view of an object created by rotating the object 45 degrees about a vertical axis, then tilting the object forward until the body diagonal appears as a point in the front view. Three axes form equal angles of 120 degrees and are called isometric axes.
Multiview Projection - ANSWER-Orthographic projection for which the object is oriented such that only 2 of its dimensions are shown. Most accurate representation of dimensions compared to pictorial drawings.
Through Hole - ANSWER-Drilled all the way through the object.
Blind Hole - ANSWER-Drilled to a certain depth.
Counterbored Hole - ANSWER-Allows the head of a fastener to be flush (to be even to a specific face). Flat bottom recess.
Countersink Hole - ANSWER-Used for flathead fasteners. Conical recess.
Spotface Hole - ANSWER-Shallow counterbore. Used for flathead fasteners.
Tolerancing - ANSWER-The total allowable variance in a dimension;
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