40 Questions
What is the purpose of a fuel heater/strainer assembly?
To heat fuel while cooling lubricating oil
What component positions the modulating valve to control oil flow through the heat exchanger?
Fuel temperature sensing thermostat
How does a typical fuel heater/strainer assembly transfer heat into the fuel?
By circulating oil or air around the tubes carrying fuel
What is contained within a matrix in a fuel heater/strainer assembly?
Tubes similar to drinking straws
In Figure 4, how does oil pass through the heat exchanger of a fuel heater/strainer assembly?
Around the tubes carrying fuel
What happens if the strainer in a fuel heater/strainer assembly blocks?
The bypass valve opens to allow fuel to continue downstream
Which component of a fuel heater/strainer assembly is responsible for filtering the fuel as it enters the engine?
Fuel strainer
From a function perspective, what role does the modulating valve play in a fuel heater/strainer assembly?
Controlling oil flow through heat exchanger
What is one of the more complex aspects of a gas turbine engine?
Fuel Nozzles
Which component is responsible for pressurizing the fuel system in a gas turbine engine?
Engine-Driven Fuel Pumps
What is used to prevent air bubbles from entering the fuel system of a gas turbine engine?
Fuel Filter
Which component in a gas turbine engine controls the amount of fuel being supplied to the engine?
Pressure Control FCU
What is responsible for measuring the speed of the engine in a gas turbine engine?
Engine RPM
Which component ensures the correct pressure level is maintained within the fuel system of a gas turbine engine?
Pressurising Valve
Which system allows for precise control of fuel flow in a gas turbine engine?
Electro Hydro-Mechanical Fuel Control Systems
What component measures the amount of fuel passing through and provides data to the engine control systems?
Fuel Flow Transmitters
What is the purpose of the oil bypass valve in the fuel heater/strainer system?
To open when the modulating valve is closed or if the exchanger becomes blocked
Where is a low-pressure fuel filter typically installed in an engine fuel system?
Downstream from a fuel heater and before an engine-driven fuel pump
What role does the fuel-sensing thermostat play in the fuel heater/strainer system?
Positions the modulating valve to regulate oil flow through the exchanger
When does the oil bypass valve open in the fuel heater/strainer system?
When the modulating valve is closed or if the exchanger becomes blocked
Which component protects a typical engine fuel system from contaminants?
The high-pressure fuel filter assembly
What happens when the modulating valve in the fuel heater/strainer system closes?
The spring-loaded oil bypass valve opens
Where is a high-pressure fuel filter typically located in an engine fuel system?
Before reaching the low-pressure fuel filter
What function does the modulating valve serve in the fuel heater/strainer system?
Regulates oil flow through the exchanger
What is the purpose of the spring located in the downstream side of the control piston?
To maintain a pressure differential of 100 PSI
During engine start, why does the pump servo piston spring move the pump cam-plate to full deflection?
To increase pump output
How does the pressure bellows affect the control piston?
By decreasing the pressure differential across the throttle
What happens to the throttle during engine start?
It opens fully
Why does fuel flow from the pump to the FCU during engine start?
To allow a pressure relief flow of fuel
How does the spring behave when the control piston senses no differential pressure?
It closes the spill valve
What is the role of the pump cam-plate during engine start?
To maximize pump output
Why is it important for fuel to pass through the back pressure valve during engine start?
To allow a pressure relief flow of fuel
What is the function of the FCU control piston?
Maintain a pressure differential across the throttle valve
How does the throttle valve contribute to adjusting the fuel pump stroke?
By modifying servo pressure
What is the role of the inlet pressure bellows in the fuel system?
Sensing air inlet ram pressure
How does the servo piston in the fuel pump operate?
Senses pump discharge pressure on one side and spring assistance on the other side
Why is the FCU control system equipped with spill valves?
To adjust fuel flow based on mass airflow
What does the high-pressure cock control in the fuel system?
Fuel pump stroke
Which component is responsible for varying the amount of fuel delivered to the engine?
The throttle valve
What is the purpose of connecting the bellows assembly to a spill valve?
To control servo bleed-off from the pump servo piston
Test your knowledge on Gas Turbine Engine Systems and Introduction based on the training material from Defence Aeroskills Training Academy. Questions may cover topics like components, operation, and maintenance of gas turbine engine systems.
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