Millwright Level 1 Practice Exam

Knurling a workpiece involves creating a patterned texture on its surface, typically to improve grip or facilitate a better mechanical connection. This process is achieved by displacing the material on the workpiece rather than removing it. As a result, the overall circumference of the workpiece increases, which means that it becomes slightly larger in diameter. This outcome is a key characteristic of knurling, making option B the correct choice. The other options do not accurately describe the results of knurling. A smoother finish is not associated with knurling, as the process creates a raised pattern rather than a flat surface. A significant decrease in shaft length is also not a consequence; knurling does not shorten the length, as it merely alters the surface. Lastly, an increase in weight does not occur because the process of knurling does not add material to the workpiece; instead, it redistributes it, maintaining the overall mass.