What type of line is normally used in a mechanical drawing to represent an edge or object not visible to the viewer?

What type of line is normally used in a mechanical drawing to represent an edge or object not visible to the viewer?

• A. Thick solid line
• B. Fine dotted line
• C. Medium weight dashed line
• D. Heavy solid line

Answer: (C)

The line type shown is used to indicate features not visible in the view. In mechanical drawings, hidden edges are drawn with a medium-weight dashed line, making it clear that the edge exists but isn’t directly seen from that perspective. This distinguishes them from visible edges, which use heavy solid lines, and from centerlines, which use a pattern of long and short dashes to mark symmetry or axes. So, the appropriate choice is the medium-weight dashed line.

The line type shown is used to indicate features not visible in the view. In mechanical drawings, hidden edges are drawn with a medium-weight dashed line, making it clear that the edge exists but isn’t directly seen from that perspective. This distinguishes them from visible edges, which use heavy solid lines, and from centerlines, which use a pattern of long and short dashes to mark symmetry or axes. So, the appropriate choice is the medium-weight dashed line.