The circle and tick marks used to lay out pressure pipes according to standard bend angles are called a:

• A. Compass
• B. Protractor
• C. Goniometer
• D. Template

Answer: (A)

The main idea here is using the right drafting tool to create and mark the bend in a pipe with a specific radius and a set of standard angles. A compass lets you draw a precise circle that represents the bend radius and then place tick marks around the circle’s circumference at the equal-angle increments corresponding to the standard bend angles. With the circle centered on the pipe layout, these marks tell you exactly where the bend should occur to achieve the required angle, making it a reliable way to lay out pressure pipes.

A protractor measures angles but doesn’t draw circles or transfer a radius. A goniometer is mainly for measuring angles between existing lines, not constructing a bend with a radii and multiple angle divisions. A template provides predefined shapes but isn’t used to construct the specific circle and its division marks on the layout. So the compass is the tool that best fits the task of circle creation and marking the standard bend increments.