Texas FFA Nursery Landscape Practice Exam

Which part of a lawn mower prevents dust from entering the carburetor?

1. Air cleaner

2. Exhaust chute

3. Hydraulic system

4. Crankcase

The correct answer is: Air cleaner

The air cleaner plays a crucial role in maintaining the efficiency and longevity of a lawn mower's engine by preventing dust and debris from entering the carburetor. The carburetor is responsible for mixing air and fuel for combustion, and if it becomes clogged with dirt, it can lead to poor engine performance or damage. The air cleaner serves as a filter, trapping particles before they can reach the carburetor, ensuring that only clean air flows into the combustion chamber. This is particularly important in outdoor environments where dust and grass clippings are commonplace. A clean air supply allows for optimal combustion, improving the mower's performance and helping it run smoothly. In contrast, the exhaust chute is designed to direct exhaust away from the engine and does not filter air. The hydraulic system is related to the mower's drive and does not interact with air intake. The crankcase is where the engine oil is stored and does not prevent dust from entering the carburetor. Overall, the air cleaner is essential for protecting the engine and ensuring efficient operation.