A ruled surface is one that may be generated by sweeping a generatrix – McqOptions

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1.	A ruled surface is one that may be generated by sweeping a generatrix along a path.
A.	1
B.
Answer» B.

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Another method used to setup an auxiliary view is to align the UCS with the inclined plane.
If an auxiliary view is symmetrical, and to save space or time, a half auxiliary view may be drawn.
A double-curved surface is generated by a curved line and has straight-line elements.
An auxiliary view is an orthographic view that is not a standard projection.
A reference plane appears as a line in an adjacent view.
Generally, hidden lines should be omitted in auxiliary views.
A single-curved surface is a developable ruled surface that can be unrolled to coincide with a cylinder.
A primary auxiliary view does not need to be parallel to the associated inclined plane.
Reference lines are always at right angles to the projection lines between the views.
Measurements are always made at right angles to the reference lines or parallel to the projection lines.