NCCER Introduction to Earthmoving (22201) Practice Test

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Which machine is primarily used to shape and finish surfaces to meet precise elevations and slopes?

Grader.

Shaping and finishing surfaces to exact elevations and slopes is done with a machine that can precisely control the surface profile. The grader is built for this purpose, featuring a long, adjustable blade (moldboard) that the operator can set in height, angle, and tilt to accurately cut, spread, and finish material. With this blade control, the grader can create the desired cross-slope and longitudinal grade, and modern models use grade-control devices or lasers to hit precise target elevations. This makes it ideal for final surface work on roads, parking lots, and airfields where tight tolerances matter.

Bulldozers are great for rough shaping and moving material but aren’t tuned for precise finish grades. Loaders and excavators move material and dig, not finish a surface to exact elevations and slopes. So the grader is the best choice for this task.

Bulldozer.

Loader.

Excavator.