Which line type would you use to show hidden features behind surfaces?

Which line type would you use to show hidden features behind surfaces?

• A. Extension Line
• B. Center Line
• C. Construction Line
• D. Hidden Line

Answer: (D)

In engineering drawings, different line types convey different kinds of information about a part’s geometry. When you need to represent edges or features that aren’t visible because they lie behind surfaces, you use hidden lines. Hidden lines are drawn as dashed lines to indicate edges that cannot be seen from the current view, so you can understand the full shape and internal features without the surface blocking them. Other line types have different roles: extension lines show where a dimension applies, center lines indicate axes or symmetry, and construction lines are light drafting guides not part of the final drawing. So for showing hidden features behind surfaces, the dashed hidden line is the appropriate choice.

In engineering drawings, different line types convey different kinds of information about a part’s geometry. When you need to represent edges or features that aren’t visible because they lie behind surfaces, you use hidden lines. Hidden lines are drawn as dashed lines to indicate edges that cannot be seen from the current view, so you can understand the full shape and internal features without the surface blocking them. Other line types have different roles: extension lines show where a dimension applies, center lines indicate axes or symmetry, and construction lines are light drafting guides not part of the final drawing. So for showing hidden features behind surfaces, the dashed hidden line is the appropriate choice.