Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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For digging open cuts, drainage ditches, and gravel pits, which type of excavator should be used if the material is to be moved from 20 to 3,000 feet before dumping?

Backhoe
Bucket-wheel excavator
Drag-line excavator
Trench excavator

The correct answer is: Drag-line excavator

The bucket-wheel excavator is particularly suited for large-scale excavation tasks such as digging open cuts, drainage ditches, and gravel pits, especially when materials need to be moved considerable distances, like 20 to 3,000 feet. This type of excavator is designed for continuous operation and has a large rotating wheel with buckets attached. As the wheel turns, it scoops up material and simultaneously moves it onto a conveyor system, allowing for efficient transport over longer distances. This efficiency makes bucket-wheel excavators ideal for projects requiring significant material movement, as they can handle a substantial volume of material quickly and continuously with minimal interruption. Their design maximizes the balance between extraction and transportation, thereby streamlining the entire operation. In contrast, other types of excavators may have limitations in terms of the volume they can excavate or the distance they can transport materials effectively, making them less suitable for such extensive tasks.