Heavy Equipment Operator Certification Exam Prep · Question
When cutting a high crown on a new road, what initial mouldboard angle would facilitate moving the maximum amount of material from the shoulders to the centre?
To move the maximum amount of material and generate a high crown, an acute mouldboard angle (e.g., 30-40 degrees) is effective. This angle allows the mouldboard
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Question: When cutting a high crown on a new road, what initial mouldboard angle would facilitate moving the maximum amount of material from the shoulders to the centre?
Answer options: ✅ An acute angle (e.g., 30-40 degrees) to the direction of travel
- An obtuse angle (e.g., 100-110 degrees) to the direction of travel
- A right angle (90 degrees) to the direction of travel
- A very shallow angle (e.g., 10-20 degrees) to the direction of travel
Correct answer: An acute angle (e.g., 30-40 degrees) to the direction of travel
Explanation: To move the maximum amount of material and generate a high crown, an acute mouldboard angle (e.g., 30-40 degrees) is effective. This angle allows the mouldboard to 'plow' the material, pushing it inwards towards the centreline, creating a windrow from which the crown can be shaped. A steeper angle would shed material more quickly.
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