Class 5 Boiler Practice Exam

A blueprint solid line with an arrow is referred to as what kind of line?

1. Dimension line

2. Center line

3. Hidden line

4. Section line

The correct answer is: Dimension line

The correct answer is that a blueprint solid line with an arrow is referred to as a dimension line. Dimension lines are used in technical drawings to indicate the distance between two points, connecting those points while incorporating arrows on each end to show the extent of measurement. Dimension lines are essential in engineering and architectural drawings because they provide clear information about the size, scale, and spatial relationships of the components being represented. They typically appear with numbers indicating the measurement placed above or next to the line, specifying the required dimensions. Other types of lines in blueprints serve different purposes: center lines indicate the midpoint of features, hidden lines represent edges or outlines that are not visible from the current view, and section lines illustrate surfaces that have been cut through in a sectional view, allowing for a clearer understanding of internal structures. Each type of line has a unique role in conveying specific information about the design on a blueprint, making it crucial to recognize them correctly.