GTS MOD2 Gas Turbine Engine Fuel Systems Quiz
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Questions and Answers

What is the function of the engine speed governor?

  • To increase engine speed
  • To maintain a steady governed state (correct)
  • To decrease engine speed
  • To control the fuel flow
  • How does the pilot servo valve rod affect roller cage position?

  • By restricting air/fuel ratio changes
  • By moving the pilot valve rod downwards
  • By moving to the left
  • By compressing a spring (correct)
  • What happens when the power lever is moved in an increase direction?

  • The pilot servo valve rod moves upwards
  • The roller moves down the incline plane
  • The flyweights move to an over-speed condition
  • The spring cap moves up the pilot servo valve rod (correct)
  • How does the pilot servo valve slow down the movement of the pilot servo control rod?

    <p>By restricting fluid displacement top to bottom</p> Signup and view all the answers

    What does compressing the flyweight speeder spring lead to?

    <p>Under-speed condition</p> Signup and view all the answers

    How is the roller cage position affected by a decrease in engine speed?

    <p>It moves downwards and to the left</p> Signup and view all the answers

    What is the role of the multiplying linkage when the engine returns to a steady governed state?

    <p>To stabilize engine speed</p> Signup and view all the answers

    What is the purpose of a bypass valve in a fuel filter assembly?

    <p>To allow fuel flow to continue if the filter element is blocked</p> Signup and view all the answers

    How are disposable fuel filter elements typically managed during maintenance?

    <p>They are discarded and replaced with new elements</p> Signup and view all the answers

    What action is taken if wear debris or unusual contaminants are found during the examination of a fuel filter element?

    <p>Investigation of the upstream fuel system is initiated</p> Signup and view all the answers

    Where is a high pressure fuel filter disc assembly typically located?

    <p>After the engine-driven fuel pump</p> Signup and view all the answers

    What does a fuel pressure differential switch measure?

    <p>Differential pressure between the inlet and outlet sides of a fuel filter</p> Signup and view all the answers

    How are high pressure fuel filter elements typically managed during maintenance?

    <p>Cleaned and reinstalled without replacement</p> Signup and view all the answers

    What is the purpose of a fuel pressure differential switch?

    <p>To measure differential pressure across a fuel filter</p> Signup and view all the answers

    What is the advantage of a variable displacement engine-driven fuel pump over a spur gear pump?

    <p>Enhanced fuel scheduling</p> Signup and view all the answers

    In a low-pressure application, what type of engine fuel filter is typically used?

    <p>Strainer filter</p> Signup and view all the answers

    Why is burner pressure sensed and signalled to a FCU?

    <p>To adjust fuel flow</p> Signup and view all the answers

    How is the metering valve controlled in a hydro-pneumatic FCU?

    <p>By oil pressure feedback</p> Signup and view all the answers

    What effect does air inlet temperature and pressure have on fuel scheduling within a FCU?

    <p>Affects fuel-air ratio</p> Signup and view all the answers

    Describe the operation of a fuel cooled oil cooler.

    <p>It cools the oil using fuel.</p> Signup and view all the answers

    What is the purpose of an integrated fuel flow transmitter?

    <p>To monitor fuel consumption</p> Signup and view all the answers

    Describe the function of a fuel pressurising and dump valve.

    <p>'Dumps' excess pressurized fuel to prevent overheating.</p> Signup and view all the answers

    What type of fuel pumps are commonly used in aircraft engines?

    <p>'Positive displacement' and 'centrifugal' pumps</p> Signup and view all the answers

    What role does a flow control hydro-mechanical FCU play when an aircraft is climbing with the engine under steady-state governed conditions?

    <p>Increases fuel flow to boost power output</p> Signup and view all the answers

    What happens to the burner pressure as the engine slows down?

    <p>Decreases</p> Signup and view all the answers

    How does the fuel flow change when the multiplying linkage moves further to the right?

    <p>Increases</p> Signup and view all the answers

    What occurs when the flyweight force reaches equilibrium with the speeder spring force?

    <p>The flyweights move back to upright position</p> Signup and view all the answers

    In what position are the flyweights after they return to an upright position?

    <p>Positioned to act on the next speed change</p> Signup and view all the answers

    What must be done before shutting down the engine with respect to turbine cooling?

    <p>Gradual turbine cooling at idle</p> Signup and view all the answers

    When is the fuel shut-off valve closed during the shutdown procedure?

    <p>At idle governed speed</p> Signup and view all the answers

    What is an essential step in engine shutdown according to the text?

    <p>'Stabilising' the engine at idle for turbine cooling</p> Signup and view all the answers

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