What happens to engine RPM when carburetor heat is applied?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Study for the ASA Powerplant Mechanic Exam. Prepare with flashcards and multiple-choice questions, with hints and detailed explanations for each question. Ace your 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.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy