Question 36Gas Turbine - Assistant Engineer

The correct answer is D) Acts as a cooling medium for the lube oil cooler. The fuel oil system of a gas turbine engine is responsible for providing accurately metered fuel for combustion (option B), acting as a hydraulic medium to actuate the fuel control (option A), and controlling the angle of the variable stator vanes (option C). However, it does not act as a cooling medium for the lube oil cooler, as that function is typically performed by a separate cooling system. The fuel oil system's primary purpose is to deliver the appropriate amount of fuel to the engine's combustion section, not to cool the lubricating oil. The lube oil cooler is typically cooled by a separate cooling system, such as a seawater or air-cooled system, to maintain the proper operating temperature of the engine's lubrication system.