Which line type is used to show the visible boundary of an object in a blueprint?

Which line type is used to show the visible boundary of an object in a blueprint?

• A. Object line
• B. Hidden line
• C. Center line
• D. Section line

Answer: (A)

In blueprint drafting, the line that shows the visible boundary of the object is the object line. It is drawn as a continuous, solid line around the exterior edges you would see in the view, and it defines the actual shape as seen directly from that perspective. This makes the outer contour clear and unambiguous. Hidden lines, by contrast, use a dashed style to indicate edges or features that aren’t visible in the current view. Center lines mark axes of symmetry or centers of holes, shown with alternating long and short dashes. Section lines indicate where a part is cut to reveal internal features. So the solid, continuous boundary line best represents the visible boundary.

In blueprint drafting, the line that shows the visible boundary of the object is the object line. It is drawn as a continuous, solid line around the exterior edges you would see in the view, and it defines the actual shape as seen directly from that perspective. This makes the outer contour clear and unambiguous.

Hidden lines, by contrast, use a dashed style to indicate edges or features that aren’t visible in the current view. Center lines mark axes of symmetry or centers of holes, shown with alternating long and short dashes. Section lines indicate where a part is cut to reveal internal features. So the solid, continuous boundary line best represents the visible boundary.