GTS Mod 4 Moderate
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Questions and Answers

What is the purpose of combustor cooling air in a gas turbine engine?

  • To reduce gas temperature before entering the nozzle guide vanes
  • To aid combustion by increasing flame temperature
  • To increase heat transfer to the combustor outer casing
  • To minimize the heat transfer to the flame tube walls (correct)

    • Why is turbine cooling essential in a gas turbine engine?

  • To increase the thermal efficiency of the combustor
  • To reduce dilution air flow to the combustor
  • To cool the nacelle walls
  • To maintain operating tolerances within the turbine area (correct)

    • What is the function of dilution air in a gas turbine engine combustor?

  • To accelerate the combustion process
  • To increase heat transfer to the combustion chamber walls
  • To reduce gas temperature before entering the nozzle guide vanes (correct)
  • To cool the turbine discs

    • Why do turbine discs in a gas turbine engine need to be cooled?

    <p>To reduce thermal fatigue and expansion rates within the turbine area</p> Signup and view all the answers

    How does nacelle cooling air affect engine performance in a gas turbine engine?

    <p>By reducing heat transfer to the combustor outer casing</p> Signup and view all the answers

    What is the main function of the airflow in a nacelle cooling system?

    <p>To purge the nacelle of flammable vapours</p> Signup and view all the answers

    Why is icing protection rarely necessary for compressor rotor blades in a gas turbine engine?

    <p>As a result of the centrifugal action they experience</p> Signup and view all the answers

    In a gas turbine engine, which components may require anti-ice protection according to the text?

    <p>Inlet guide vanes and engine nose cone</p> Signup and view all the answers

    What is the purpose of a pneumatic anti-ice system in a gas turbine engine?

    <p>To prevent ice formation on engine surfaces</p> Signup and view all the answers

    How does keeping the airflow to a minimum benefit a nacelle cooling system?

    <p>Reduces engine drag</p> Signup and view all the answers

    What method is used to cool engine accessories during flight?

    <p>Ram air delivered through appropriately placed scoops in nacelle cowling</p> Signup and view all the answers

    How is induced cooling of engine accessories achieved during ground operation?

    <p>Compressor bleed air flowing through nozzles in the cooling air outlet duct</p> Signup and view all the answers

    How is airflow controlled in the engine accessory cooling system to ensure operation only during ground running?

    <p>By a valve</p> Signup and view all the answers

    Which method is NOT mentioned as a way to cool engine accessories in the text?

    <p>Cooling air generated by a blower fan driven by the accessory gearbox</p> Signup and view all the answers

    What is a method used to draw atmospheric air through the intake louvres for cooling?

    <p>The low pressure area created by air velocity through nozzles</p> Signup and view all the answers

    What is the purpose of pre-swirl nozzles in a gas turbine engine?

    <p>To reduce the temperature and pressure of the cooling air for blade cooling</p> Signup and view all the answers

    What plays a vital role in determining the life of turbine vanes and blades?

    <p>The operating temperature they are exposed to</p> Signup and view all the answers

    What was a significant improvement in the cooling methods of gas turbine engine components over time?

    <p>Implementing single pass internal cooling in the 1960s</p> Signup and view all the answers

    How does internal air cooling impact hardware life in a gas turbine engine?

    <p>It is vital for hardware life</p> Signup and view all the answers

    What is the purpose of creating a radial swirl in the cooling air for turbine blades and NGVs?

    <p>To assist efficient entry of air into the rotating cooling passages</p> Signup and view all the answers

    What is the purpose of turbine blade cooling in a gas turbine engine?

    <p>To prevent overheating and maintain the structural integrity of the turbine blades</p> Signup and view all the answers

    Which component controls turbine disc inter-stage cooling?

    <p>Turbine inter-stage seals</p> Signup and view all the answers

    How does hot gas intrusion affect turbine disc cooling?

    <p>Causes mainstream gas to flow into the disc cavities</p> Signup and view all the answers

    What is the function of multi-pass internal air film cooling in gas turbine engines?

    <p>To provide enhanced cooling for both vanes and blades</p> Signup and view all the answers

    Which type of cooling air helps prevent hot gas intrusion in turbine disc cavities?

    <p>Nacelle cooling air</p> Signup and view all the answers

    What is the main purpose of an engine internal cooling system?

    <p>To ensure parts of the engine do not overheat</p> Signup and view all the answers

    Which components of a gas turbine engine require cooling air according to the text?

    <p>Combustors and turbines</p> Signup and view all the answers

    What function does the combustor cooling serve in a gas turbine engine?

    <p>To absorb excess heat from the combustor</p> Signup and view all the answers

    In the context of engine internal cooling, what does LP stand for?

    <p>Low Pressure</p> Signup and view all the answers

    What percentage of air entering the combustor is allocated for combustor cooling?

    <p>20%</p> Signup and view all the answers

    What part of the gas turbine engine is responsible for controlling the amount of airflow according to the temperature of the tapped air?

    <p>Air regulators</p> Signup and view all the answers

    When the anti-ice shut-off valves are opened, where does the air flow next in the system?

    <p>On to the nose cone area</p> Signup and view all the answers

    What are the components typically found in a gas turbine engine anti-icing system?

    <p>Air regulators and anti-ice valves</p> Signup and view all the answers

    Which part of the gas turbine engine is used to tap hot air for anti-icing systems in some cases?

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

    What indicates a normal response to a gas turbine engine losing compressor air?

    <p>Rise in exhaust gas temperature</p> Signup and view all the answers

    Which component controls the amount of airflow in a gas turbine engine anti-icing system based on the temperature of the tapped air?

    <p>Air regulators</p> Signup and view all the answers

    Where is anti-icing air usually taken from in a gas turbine engine?

    <p>High pressure compressor</p> Signup and view all the answers

    What does a light in the cockpit indicate when the anti-ice switch is actuated?

    <p>Increase in exhaust gas temperature</p> Signup and view all the answers

    Which part of the gas turbine engine might register a discernible change when the anti-ice switch is actuated?

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

    What part of the anti-ice system is responsible for allowing air to flow through to the nose cone area?

    <p>Air regulator</p> Signup and view all the answers

    How is the reset valve in the compressor bleed valve system activated?

    <p>By a reset cam connected to the bleed valve shaft</p> Signup and view all the answers

    Which component assists in applying low pressure (PT2) to the diaphragm in the compressor bleed valve system?

    <p>Spring force</p> Signup and view all the answers

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