FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

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What is one of the functions of the fuel oil heat exchanger on a turbojet engine?

Decrease the oil viscosity
Increase the fuel temperature
Cool down the oil
Filter out contaminants

The correct answer is: Increase the fuel temperature

The fuel oil heat exchanger plays a crucial role in managing the temperatures of both the fuel and the oil in a turbojet engine. One of its primary functions is to increase the fuel temperature. By utilizing the heat generated by the oil, the heat exchanger warms the fuel as it passes through the unit. This warming process has multiple benefits, including reducing the risk of fuel freezing at high altitudes where temperatures can drop significantly. Moreover, warmer fuel enhances combustion efficiency during engine operation. Increasing the temperature of the fuel helps maintain optimal viscosity, which supports the smooth operation of fuel systems and ensures proper atomization of fuel when injected into the combustion chamber. This leads to better performance and efficiency of the engine overall.