FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

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What component of a carburetor measures the amount of air delivered to the engine?

Throttle valve
Float chamber
Venturi
Discharge nozzle

The correct answer is: Venturi

The component of a carburetor that measures the amount of air delivered to the engine is the Venturi. The Venturi effect occurs when air flows through a constricted area of the carburetor, which causes a decrease in pressure and an increase in velocity. This design allows the Venturi to accurately measure and regulate the flow of air entering the engine, ensuring that the correct air-fuel mixture is maintained for optimal combustion. The shape and size of the Venturi influence both the airflow and the vacuum produced, which is critical for drawing fuel into the airstream from the float chamber. This precise measurement is essential for engine performance, as it helps achieve the correct balance of fuel and air, particularly during varying engine speeds and loads.