What type of design representation is characterized by the use of lines indicating alternate positions?

The type of design representation characterized by the use of lines indicating alternate positions is known as phantom lines. Phantom lines are used in technical drawings to represent elements that are not in their current position or to illustrate the movement of an object. They can signify the outline of an object in a different position, such as the location of a part that is not seen in the current view or moveable parts in a mechanism.

These lines typically consist of a long dash followed by two short dashes, distinguishing them from other line types. While section views provide a cut-through perspective of an object and hidden lines represent edges or features that are not visible from the current viewpoint, phantom lines specifically denote alternate positions or movements, making them essential for illustrating complex assemblies and the interaction of components in engineering drawings. Dimension lines are utilized to indicate measurements and sizes but do not convey movement or alternate positions. Thus, phantom lines are the most appropriate choice for this context.