Excavator Operator Certification Exam Prep · Question
What is a primary factor that causes an excavator's lift capacity to decrease as the load radius increases?
As the load radius increases, the distance of the load from the excavator's centre of gravity increases, creating a greater overturning moment. This increased m
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Question: What is a primary factor that causes an excavator's lift capacity to decrease as the load radius increases?
Answer options:
- Increased hydraulic pressure requirements
- Reduced engine torque ✅ Increased overturning moment
- Decreased counterweight effectiveness
Correct answer: Increased overturning moment
Explanation: As the load radius increases, the distance of the load from the excavator's centre of gravity increases, creating a greater overturning moment. This increased moment reduces the machine's stability and thus its lift capacity. The other options are not the primary reason for decreased capacity with increased load radius.
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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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