Intro to Millwright Practice Exam

Which line type on prints shows the outlines or edges of a structure?

1. Center Line

2. Phantom Line

3. Object Line

4. Hidden Line

The correct answer is: Object Line

The line type that shows the outlines or edges of a structure is the object line. Object lines are solid, thick lines used in technical drawings to represent the visible edges and contours of a three-dimensional object or structure. These lines are crucial in conveying the shape and physical form of the object being represented, ensuring clarity and understanding in the design or construction process. In millwrighting and engineering, recognizing object lines is essential for interpreting technical drawings accurately and forming a clear understanding of the structure’s layout and components. Other line types, such as center lines, phantom lines, and hidden lines, serve different purposes. Center lines typically indicate the axes of symmetry or rotation, phantom lines illustrate alternate positions or motions of an object, and hidden lines indicate features that are not visible from the current view. While important for conveying additional information, none of these other line types represent the outlines or edges of structures like object lines do.