Which of the following statements about the induction system is true?

• A. The induction system has four main sectors.
• B. The three main sectors are air intake, carburetor, and inlet manifold.
• C. The turbocharger is always located before the carburetor.
• D. Air intakes are never forward facing.

Answer: (B)

The induction system is structured around three main stages: bringing in clean air, metering and mixing that air with fuel, and delivering the resulting mixture to the cylinders. The first stage, the air intake, gathers air through ducts and filters it as needed. The second stage, the carburetor, meters the fuel and blends it with the incoming air. The third stage, the inlet manifold, distributes the air-fuel mixture to each cylinder’s intake port. This three-section setup is why the statement describing three main sectors is correct. The idea of four main sectors isn’t standard for a typical induction system; turbocharger placement isn’t fixed in relation to the carburetor across all installations; and air intakes can be forward-facing in many aircraft designs.