USN Road Grader Practice Exam

The correct positioning of the grader from Right-Hand Side Grading to Left-Hand Side Grading involves a specific rotation of the circle blade. When the blade is turned clockwise to an angle of 25-30 degrees, it effectively facilitates a smooth transition in the grading process. This orientation helps in controlling the material being moved and provides better accuracy in grading. By adjusting the blade in this manner, the operator can maintain a consistent grading profile while ensuring optimal visibility and control over the grading task.

The other options may suggest adjustments related to height or orientation that are less effective or relevant for shifting from right-hand to left-hand grading. For example, center shifting or lowering the blade might alter the grader's functionality without adequately addressing the orientation needed for effective left-hand grading. Leaning wheels toward the toe could impact stability and control but does not provide the necessary blade positioning for the task. Thus, the correct approach emphasizes the importance of the blade's rotation for achieving the desired grading result.