Phantom lines in technical drawings are used to convey which concept?

Phantom lines in technical drawings are used to convey which concept?

• A. They show a visible edge clearly
• B. They indicate a dimension line
• C. They mark the centerline of symmetry
• D. They indicate alternate positions or features

Answer: (D)

Phantom lines convey alternate positions or features of a part. They’re used when a component could be in a different location or configuration, or to show a path of motion, without cluttering the current view. You’ll often see them drawn lighter and with a dashed pattern so they’re clearly distinct from the solid, visible edges. For example, you might show a lever in its present position with solid lines and its next position with phantom lines. This is different from visible edges, which are solid lines for what is actually seen; dimension lines, which use arrowheads to indicate measurements; and centerlines, which indicate symmetry or axis locations with a long-short dash pattern.

Phantom lines convey alternate positions or features of a part. They’re used when a component could be in a different location or configuration, or to show a path of motion, without cluttering the current view. You’ll often see them drawn lighter and with a dashed pattern so they’re clearly distinct from the solid, visible edges. For example, you might show a lever in its present position with solid lines and its next position with phantom lines. This is different from visible edges, which are solid lines for what is actually seen; dimension lines, which use arrowheads to indicate measurements; and centerlines, which indicate symmetry or axis locations with a long-short dash pattern.