GTS MOD2 Electrical Startup
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Questions and Answers

What is the purpose of a fuel heater/strainer assembly?

  • To cool fuel while heating lubricating oil
  • To heat fuel while cooling lubricating oil (correct)
  • To regulate the temperature of compressor air
  • To filter fuel before entering the engine

    • What component positions the modulating valve to control oil flow through the heat exchanger?

  • Fuel strainer
  • Strainer mesh
  • Bypass valve
  • Fuel temperature sensing thermostat (correct)

    • How does a typical fuel heater/strainer assembly transfer heat into the fuel?

  • By circulating oil or air around the tubes carrying fuel (correct)
  • By controlling the temperature of compressor air
  • By using a bypass valve
  • By filtering the fuel before it enters the engine

    • What is contained within a matrix in a fuel heater/strainer assembly?

    <p>Tubes similar to drinking straws</p> Signup and view all the answers

    In Figure 4, how does oil pass through the heat exchanger of a fuel heater/strainer assembly?

    <p>Around the tubes carrying fuel</p> Signup and view all the answers

    What happens if the strainer in a fuel heater/strainer assembly blocks?

    <p>The bypass valve opens to allow fuel to continue downstream</p> Signup and view all the answers

    Which component of a fuel heater/strainer assembly is responsible for filtering the fuel as it enters the engine?

    <p>Fuel strainer</p> Signup and view all the answers

    From a function perspective, what role does the modulating valve play in a fuel heater/strainer assembly?

    <p>Controlling oil flow through heat exchanger</p> Signup and view all the answers

    What is one of the more complex aspects of a gas turbine engine?

    <p>Fuel Nozzles</p> Signup and view all the answers

    Which component is responsible for pressurizing the fuel system in a gas turbine engine?

    <p>Engine-Driven Fuel Pumps</p> Signup and view all the answers

    What is used to prevent air bubbles from entering the fuel system of a gas turbine engine?

    <p>Fuel Filter</p> Signup and view all the answers

    Which component in a gas turbine engine controls the amount of fuel being supplied to the engine?

    <p>Pressure Control FCU</p> Signup and view all the answers

    What is responsible for measuring the speed of the engine in a gas turbine engine?

    <p>Engine RPM</p> Signup and view all the answers

    Which component ensures the correct pressure level is maintained within the fuel system of a gas turbine engine?

    <p>Pressurising Valve</p> Signup and view all the answers

    Which system allows for precise control of fuel flow in a gas turbine engine?

    <p>Electro Hydro-Mechanical Fuel Control Systems</p> Signup and view all the answers

    What component measures the amount of fuel passing through and provides data to the engine control systems?

    <p>Fuel Flow Transmitters</p> Signup and view all the answers

    What is the purpose of the oil bypass valve in the fuel heater/strainer system?

    <p>To open when the modulating valve is closed or if the exchanger becomes blocked</p> Signup and view all the answers

    Where is a low-pressure fuel filter typically installed in an engine fuel system?

    <p>Downstream from a fuel heater and before an engine-driven fuel pump</p> Signup and view all the answers

    What role does the fuel-sensing thermostat play in the fuel heater/strainer system?

    <p>Positions the modulating valve to regulate oil flow through the exchanger</p> Signup and view all the answers

    When does the oil bypass valve open in the fuel heater/strainer system?

    <p>When the modulating valve is closed or if the exchanger becomes blocked</p> Signup and view all the answers

    Which component protects a typical engine fuel system from contaminants?

    <p>The high-pressure fuel filter assembly</p> Signup and view all the answers

    What happens when the modulating valve in the fuel heater/strainer system closes?

    <p>The spring-loaded oil bypass valve opens</p> Signup and view all the answers

    Where is a high-pressure fuel filter typically located in an engine fuel system?

    <p>Before reaching the low-pressure fuel filter</p> Signup and view all the answers

    What function does the modulating valve serve in the fuel heater/strainer system?

    <p>Regulates oil flow through the exchanger</p> Signup and view all the answers

    What is the purpose of the spring located in the downstream side of the control piston?

    <p>To maintain a pressure differential of 100 PSI</p> Signup and view all the answers

    During engine start, why does the pump servo piston spring move the pump cam-plate to full deflection?

    <p>To increase pump output</p> Signup and view all the answers

    How does the pressure bellows affect the control piston?

    <p>By decreasing the pressure differential across the throttle</p> Signup and view all the answers

    What happens to the throttle during engine start?

    <p>It opens fully</p> Signup and view all the answers

    Why does fuel flow from the pump to the FCU during engine start?

    <p>To allow a pressure relief flow of fuel</p> Signup and view all the answers

    How does the spring behave when the control piston senses no differential pressure?

    <p>It closes the spill valve</p> Signup and view all the answers

    What is the role of the pump cam-plate during engine start?

    <p>To maximize pump output</p> Signup and view all the answers

    Why is it important for fuel to pass through the back pressure valve during engine start?

    <p>To allow a pressure relief flow of fuel</p> Signup and view all the answers

    What is the function of the FCU control piston?

    <p>Maintain a pressure differential across the throttle valve</p> Signup and view all the answers

    How does the throttle valve contribute to adjusting the fuel pump stroke?

    <p>By modifying servo pressure</p> Signup and view all the answers

    What is the role of the inlet pressure bellows in the fuel system?

    <p>Sensing air inlet ram pressure</p> Signup and view all the answers

    How does the servo piston in the fuel pump operate?

    <p>Senses pump discharge pressure on one side and spring assistance on the other side</p> Signup and view all the answers

    Why is the FCU control system equipped with spill valves?

    <p>To adjust fuel flow based on mass airflow</p> Signup and view all the answers

    What does the high-pressure cock control in the fuel system?

    <p>Fuel pump stroke</p> Signup and view all the answers

    Which component is responsible for varying the amount of fuel delivered to the engine?

    <p>The throttle valve</p> Signup and view all the answers

    What is the purpose of connecting the bellows assembly to a spill valve?

    <p>To control servo bleed-off from the pump servo piston</p> Signup and view all the answers

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