Texas FFA Nursery Landscape Practice Exam

Professional-grade string trimmers are usually powered by:

1. Electricity

2. Diesel fuel

3. A 2-cycle engine

4. A 4-cycle engine

The correct answer is: A 2-cycle engine

Professional-grade string trimmers are primarily powered by a 2-cycle engine due to their power-to-weight ratio and efficiency in delivering the necessary speed for cutting grass and weeds. The 2-cycle engine design allows for a lightweight and compact power unit, which is essential for maneuverability in landscape maintenance tasks. These engines mix oil with fuel, providing lubrication as the engine runs, which can contribute to easier starting and higher power output relative to their size. While electric trimmers may appeal to some users for their near-silent operation and reduced maintenance, they often lack the power needed for heavy-duty or commercial applications. Diesel fuel is typically associated with larger machinery rather than handheld tools like string trimmers. 4-cycle engines, while more fuel-efficient and quieter than 2-cycle engines, tend to be bulkier and heavier, which can limit their practicality for a tool that is frequently used in tight spaces and over extended periods. Thus, the 2-cycle engine remains the preferred choice for professional-grade string trimmers.