AMP - Aviation Maintenance Technician Powerplant Practice Exam

Which of the following best describes the function of an automatic mixture control (AMC)?

It compensates for change in the air density due to temperature and altitude. It compensates for the air pressure above the fuel in the float chamber. It compensates for the air pressure in the venturi of a float-type carburetor. It adjusts fuel flow based on engine RPM.

Correct Answer:

It compensates for change in the air density due to temperature and altitude.

Explanation:

An automatic mixture control (AMC) operates by continuously adjusting the fuel-to-air mixture in an engine to compensate for changes in air density caused by variations in temperature and altitude. This ensures that the engine runs smoothly and efficiently regardless of external conditions. Option B is incorrect because the AMC is not concerned with the air pressure above the fuel in the float chamber, but rather the air density. Option C is incorrect because the venturi of a float-type carburetor is not where the AMC operates. Option D is incorrect because the function of an AMC goes beyond simply adjusting fuel flow based on engine RPM. Overall, the function of an AMC is to maintain a proper fuel-to-air ratio for optimal engine performance.

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