What happens to engine RPM when carburetor heat is applied?

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Prepare for the ASA Powerplant Mechanic Test with detailed study materials, hints, and multiple-choice questions. Master your skills and get ready for your certification exam with confidence!

Multiple Choice

What happens to engine RPM when carburetor heat is applied?

Explanation:
Applying carburetor heat warms the air entering the carburetor. Warmer air is less dense, so less air mass (and thus less oxygen) reaches the cylinders for each intake stroke. With the same fuel metering, this reduced air mass means less combustible charge and less power, so the engine RPM drops. This drop is the expected response as icing is melted and the air flow changes. Once heat is removed and the air returns to cooler, denser conditions, RPM tends to return toward normal.

Applying carburetor heat warms the air entering the carburetor. Warmer air is less dense, so less air mass (and thus less oxygen) reaches the cylinders for each intake stroke. With the same fuel metering, this reduced air mass means less combustible charge and less power, so the engine RPM drops. This drop is the expected response as icing is melted and the air flow changes. Once heat is removed and the air returns to cooler, denser conditions, RPM tends to return toward normal.

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