Drafting & Design Principles & Techniques Flashcards

Which type of line is used to show the boundary of a partial or interrupted view in technical drafting?

Answer: Break line

Break lines (short or long) indicate that a portion of the object has been removed to save space or reveal interior detail.

In geometric construction, which method is used to bisect a given angle?

Answer: Draw arcs from each ray and connect intersection points to the vertex

Bisecting an angle with a compass involves drawing equal arcs from each ray, then connecting the arc intersection to the vertex.

What does the term 'true shape' mean in descriptive geometry?

Answer: The actual size and shape of a surface as seen in a view parallel to that surface

True shape appears in a view where the line of sight is perpendicular to the surface, showing its actual dimensions without foreshortening.

Which drafting instrument is specifically designed to draw lines at any angle relative to a straightedge?

Answer: Adjustable triangle

An adjustable triangle (or drafting machine) allows the drafter to set and lock any angle for drawing inclined lines.

In CAD drafting, what is the purpose of a 'layer' system?

Answer: To organize different types of information so they can be controlled independently

Layers allow drafters to separate elements such as dimensions, annotations, and geometry so each type can be toggled, locked, or plotted independently.

A 'runout' in engineering drawing refers to:

Answer: The gradual blend where a curved surface meets a flat surface

A runout is a drafting convention showing the smooth transition (fillet or round) where a curved feature meets a flat surface.

Which of the following best describes the 'flat pattern' or 'development' of a geometric solid?

Answer: The unfolded surface of a 3D shape laid flat

A development (flat pattern) is the unfolded representation of a 3D object's surfaces laid out on a flat plane, used in sheet metal and packaging.