CAD / Engineering 1
EXAM Segment 5: Orthographic Projection
1) The rule for selecting the number of required views is...
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Draw only the number of required views.
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2) The three precedence of lines in drafting rules...
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a) visible lines have precedence over CENTER LINES and HIDDEN LINES.
b) Hidden Lines have precedence over CENTER lines. |
3) The three most common views displayed in 3rd Angle Projection...
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1) Front
2) Top 3) Side |
5) Three points about 1st angle projection...
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1) First Angle Projection is used outside of the United States.
2)Views and projection planes are behind the part. 3)First angle projections are usually in metric. |
8) Straight lines that do not meet or intersect and are an equal distance apart at all points are known as perpendicular lines...
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FALSE
Parallel lines are lines that do not meet or intersect. |
9) In orthographic projection, the projection lines are...?
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a. At a 45° angle to the surface projected.
b. Parallel to the surface projected. c. Perpendicular to the surface projected. d. Adjacent to the projection plane. |
10) Outside the
United States and Canada the rest of the industrial world uses which type of orthographic projection?
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1st Angle Projection
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14) The United States uses 1st angle projection for orthographic views.
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FALSE
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15) How do engineers determine which type of sketch is appropriate for the design problem in question?
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Should communicate a complete understanding of the subject.
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16) projection theory
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Compromises the principles used to graphically represent 3D objects and structures on 2D media such as paper and the computer screen.
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17) lines of sight LOS
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Imaginary rays of light between an observer’s eye and an object.
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18) parallel projection
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Requires that the object be positioned at infinity and viewed from multiple points on an imaginary line parallel to the object
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19) plane of projection
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Is an imaginary flat plane upon which the image created by the LOS is projected
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20) multiview orthographic projection
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In an object behind the plane of projection is oriented in such a way that only two of its dimensions are shown
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21) frontal plane projection
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Is the plane onto which the view selected as the front of an object is projected.
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22) horizontal plane projection
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Which is a plane suspended above and parallel to the top of the object
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23) profile plane of projection
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Which is a plane that is parallel to the right side of the object
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