Cadd Knowledge Questions Flashcards
How many sides does a pentagon have?
Five.
How many sides does a hexagon have?
Six.
How many sides does an octagon have?
Eight.
What is the most accurate method of drawing an ellipse?
The concentric-circle method.
What does a unit on the mechanical engineer’s scale represent?
An Inch.
What does a unit on the architect’s scale represent?
A foot.
If you were told to make a quarter size drawing of a machine part, what drafting scale might you use?
Mechanical engineer’s scale.
If you were told to make a quarter size drawing of a 1/64 reduction of a contstruction detail, what drafting scale might you use?
Architect’s Scale.
If you were told to make a quarter size drawing of a chart of a survey, what drafting scale might you use?
Chain Scales
How would you indicate on an engineering drawing a scale of 3 inches to 1 foot?
1/4
How would you indicate on an architectural drawing 3 inches to 1 foot?
3”= 1’-0
Why is it useful to remember that he slide rule is based on the principle of proportion?
If you remember that a slide rule is based on the principle of proportion , you will find it easier ot keep from being confused concerning which scale to use in locating the answer to a problem.
Which scales on the slide rule are used in multiplying , dividing, and in solving problems of proportion?
The C and D scales
Orthographic projection is a means for showing what relationship?
Orthographic projection is a means for shoing the relationship of all sides of an object.
What are the lines called which are drawn to carry over dimensions from view to view?
Construction lines
How are extension lines used?
Extension lines are used to extend the dimensions beyond the outline of a view so that they can be read easily.
How are center lines used on a drawing?
center lines are used to indicate the center of a symmetrical object and the center of a circle or arc.
is it permissible to substitute a visible line of the drawing for an extension line?
It should be avoided , if possible.
What are leaders used for?
Leaders are used to connect numbers, references, or notes to the appropriate surface on the drawing.
What are break lines used for?
Breaklines are used to save space where an extended part of an object has the same continuous shape and size.
What do cutting plane lines indicate?
Cutting plane lines indicate the plan or planes in which a sectional view is taken
How are viewing plane lines used?
Viewing plane lines are used to indicate the plane or planes from which a surface or several surfaces are viewed.
Describe the two systems of dimensioning.
In the rectangular system , horizontal or vertical dimension lines are drawn parallel to the distance to be dimensioned and any necessary extension lines are drawn perpendicular to it. In the angular system, the position of a point , line, or surface is shown by means of angles and linear dimensions at an angle other than 90 degrees.
In dimensioning angles, how are the dimension lines drawn?
As arcs.
