Excavator Operator Certification Exam Prep · Question
When attaching a hydraulic thumb to an excavator, what is the primary function of the thumb?
A hydraulic thumb works in conjunction with the bucket to grab and manipulate objects like rocks, logs, or demolished material. It is essentially a versatile gr
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Question: When attaching a hydraulic thumb to an excavator, what is the primary function of the thumb?
Answer options:
- To increase digging depth.
- To improve fine grading capabilities. ✅ To provide a gripping mechanism for handling irregular objects.
- To enhance overall breakout force.
Correct answer: To provide a gripping mechanism for handling irregular objects.
Explanation: A hydraulic thumb works in conjunction with the bucket to grab and manipulate objects like rocks, logs, or demolished material. It is essentially a versatile gripping tool. It does not primarily increase digging depth, fine grading capabilities, or direct breakout force.
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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