Small Engine Technology Certification Practice Exam 2025 - Free Practice Questions and Study Guide

Question: 1 / 550

What effect does the intake stroke have on the carburetor?

It increases pressure in the combustion chamber

It maintains constant fuel flow to the fuel bowl

It creates vacuum pressure in the combustion chamber and intake manifold

The intake stroke is a crucial part of the engine cycle, during which the piston moves down the cylinder, creating a vacuum in the intake manifold. This vacuum pressure is essential for drawing air into the combustion chamber. As the piston descends, the reduced pressure allows the carburetor to function properly, as it relies on this vacuum to pull fuel from the fuel bowl into the airflow, mixing it with air before it enters the combustion chamber.

This process ensures that the correct air-fuel mixture is achieved for combustion. The generation of this vacuum pressure during the intake stroke is thus vital for the carburetor's operation and overall engine performance.

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It stops the fuel flow completely

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