FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What is used in many aircraft to prevent bubbles in the fuel when atmospheric pressure is lower than fuel vapor pressure?

  1. Filtration systems

  2. Boost pumps

  3. Pressure regulators

  4. Valve controllers

The correct answer is: Boost pumps

Boost pumps are used in aircraft to prevent bubbles in the fuel when atmospheric pressure is lower than fuel vapor pressure. This is because boost pumps are designed to provide a steady and consistent flow of fuel to the engine, which helps to prevent any air bubbles from forming. Filtration systems, pressure regulators, and valve controllers may play important roles in an aircraft's fuel system, but they do not specifically address the issue of preventing bubbles in the fuel.