Texas FFA Nursery Landscape Practice Exam

Which fuel is used in chainsaws, string trimmers, and other 2-cycle engines?

1. Fuel oil

2. Gasoline and oil mix

3. Gasoline

4. Diesel

The correct answer is: Gasoline and oil mix

Two-cycle engines, such as those used in chainsaws and string trimmers, require a specific fuel mixture to operate efficiently. The correct answer refers to a gasoline and oil mix, which is essential for the proper functioning of these engines. In a two-cycle engine, the gasoline provides the necessary energy for combustion, while the oil serves multiple purposes. It lubricates the engine's moving parts, reduces friction, and helps to cool the engine. This fuel mixture is unique to two-cycle engines, as they do not have a separate lubrication system like four-cycle engines. Instead, the oil is mixed directly with the gasoline, ensuring that the engine parts receive lubrication with every cycle. Using just gasoline or any alternative fuels, such as fuel oil or diesel, could lead to inadequate lubrication, increased wear, and potential engine damage. Therefore, for the reliable and smooth operation of chainsaws and string trimmers that rely on two-cycle engines, the correct fuel choice is the specified gasoline and oil mix.