Commercial jet aircraft route cold aviation fuel through fuel-oil heat exchangers before the fuel reaches the engine fuel nozzles. This system transfers thermal energy from hot engine lubricating oil directly into the incoming jet fuel. By cooling the engine oil to maintain optimal lubricating viscosity, the heat exchanger simultaneously warms the fuel, preventing microscopic suspended moisture from freezing and obstructing fine fuel filter meshes during high-altitude cruise.
Based on the passage, which of the following conclusions is most logically supported?
- AJet fuel must be mixed with chemical anti-icing additives before passing through the heat exchanger to prevent filter clogging.
- BHigh engine lubricating oil temperatures are caused by microscopic moisture freezing in the fuel delivery lines.
- The heat exchanger system provides dual operational benefits by stabilizing oil properties and preventing fuel filter blockages.Answer
- DFuel-oil heat exchangers completely eliminate the need for secondary air-cooled oil radiators on commercial aircraft.
Answer
The heat exchanger system provides dual operational benefits by stabilizing oil properties and preventing fuel filter blockages.
The conclusion that the heat exchanger provides dual operational benefits is strictly supported by textual evidence: the passage explicitly identifies two concurrent advantages—preserving oil lubricating viscosity and preventing ice from obstructing fuel filter meshes.
Step-by-Step Solution
Key Concept
Distinguishing Supported from Unsupported Inferences
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