Drafting & Design Principles & Techniques Flashcards

What is the purpose of an auxiliary view in technical drawing?

Answer: To show the true shape of an inclined surface not visible in standard views

An auxiliary view is projected onto a plane parallel to the inclined surface, revealing its true size and shape.

In multiview drawing, which view is typically positioned directly below the front view?

Answer: Bottom view

In third-angle projection (US standard), the bottom view is placed below the front view, showing what is seen looking up at the object.

What is the function of 'crosshatching' in a section view?

Answer: To indicate the material cut by the cutting plane

Section lines (crosshatching) are drawn at 45° on cut surfaces to distinguish solid material from voids and indicate that the surface was cut.

Which geometric relationship is true of two lines that are 'parallel' in space?

Answer: They never intersect and remain equidistant

Parallel lines maintain a constant distance from each other and never intersect, regardless of how far they are extended.

When dimensioning a drawing, the 'unidirectional' system means:

Answer: All dimension numerals are read from the bottom of the sheet

In the unidirectional system, all dimension values are oriented to be read from the bottom of the drawing sheet, regardless of dimension line direction.

A 'phantom line' (long-short-short-long dash pattern) is used to show:

Answer: Alternate positions of moving parts or adjacent parts not part of the object

Phantom lines indicate alternate positions of moving parts, repeated features, or the outlines of adjacent parts for reference.

In technical drawing, 'foreshortening' occurs when:

Answer: A line or surface appears shorter than its true length because it is not parallel to the projection plane

Foreshortening is the visual shortening of a feature when it is inclined to the projection plane, making it appear shorter than its actual length.