Turbine Engines
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| show | -Reduced vibration
-Improved airflow characteristics
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| What design feature do some turbine blades have to reduce vibration and improve airflow? | show 🗑
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| In a Dual-Spool Compressor, at what speed does the Low-Speed compressor operate? | show 🗑
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| What variables affect the inlet air density on a turbine engine? | show 🗑
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| Aircraft speed, Altitude, and ambient temperature will all affect the Inlet Air _ of a turbine engine. | show 🗑
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| show | It cuts off fuel to the nozzles, and drains the manifolds.
-Prevents fuel boiling off from residual engine heat.
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| What does "Field Cleaning" an engine mean? | show 🗑
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| show | Field Cleaning
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| What are 3 Types of Turbine Blades (not how they're mounted). | show 🗑
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| What is the purpose of an Automatic Bleed Valve? | show 🗑
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| What is one function of the Nozzle Diaphragm in a turbine engine? | show 🗑
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| Main advantage of an Axial-Flow compressor vs. Centrifugal. | show 🗑
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| Should, and how would you blend a Turbine blade? | show 🗑
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| show | Directs (Guides*) air into 1st Stage rotor at the proper angle.
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| The airfoils that DO NOT rotate in an Axial-Flow compressor are called _? | show 🗑
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| show | Do Not move (Think "Stationary"
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| show | Creep (Permanent Elongation of blades)
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| show | Permanent Elongation of turbine blades, caused by continued/excessive heat and Centrifugal Force.
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| Hot Section inspections are normally required when? | show 🗑
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| What factors affect a Turbine engine's Thermal Efficiency? | show 🗑
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| Turbine Inlet temp, Compression Ratio and Turbine/Compressor Efficiency all affect the _ _ of a Turbine Engine? | show 🗑
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| Which has higher Pressure Ratios? (Axial/Centrifugal) flow compressors. | show 🗑
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| One advantage of Centrifugal-flow Compressors is a High _ _ -per-stage. | show 🗑
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| What is the primary function of the Turbine Assembly in a Turbojet Engine? | show 🗑
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| What is Standard Atmosphere? (Temperature F/C) | show 🗑
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| show | 29.92 in/mercury
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| show | Calculating the power of an engine.
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| When an engine with multiple-stage compressors is operated @ high altitudes, the low pressure rotor will (Increase/Decrease) in speed as the compressor load (increases/decreases) | show 🗑
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| The Low-Pressure rotor in a split compressor will increase speed when the compressor load _? | show 🗑
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| Stator Vanes serve what purpose in an Axial-flow compressor section? | show 🗑
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| Stator Vanes convert the Velocity from the Rotors into what kind of energy? | show 🗑
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| Which turbine engine offers the greatest advantages for starting flexibility, and improved high-altitude performance? | show 🗑
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| show | The Low-Pressure compressor
-*The fan is big enough that some of the air passes through the outside of the engine casing
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| If the fuel/air mixture on a turbine is too weak (assuming normal airflow), the result may be_? | show 🗑
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| Turbine engine Main Bearing Oil Seals are usually what type? | show 🗑
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| show | Main Bearing Oil Seals
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| If a turbine engine can't reach T/O EPR before the EGT limit is reached, this could indicate _? | show 🗑
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| show | Starter, Ignition, Fuel
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| What areas of a turbine engine are susceptible to dirt? | show 🗑
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| Engine driven propellers impart a (large/small) amount of acceleration to a (large/.small) mass of air. | show 🗑
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| show | The transfer of metal from one surface to another.
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| show | Galling
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| Who establishes mandatory replacement times for critical engine components? | show 🗑
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| What type of combustion chamber Case & Liner are removed/installed as ONE unit? | show 🗑
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| When subsonic air flows through a Convergent Nozzle, the velocity _? | show 🗑
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| When subsonic air flows through a Divergent Nozzle, the velocity _? | show 🗑
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| When Supersonic air flows through a Divergent Nozzle, the velocity _? | show 🗑
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| show | Main bearing distress
*Bearing is overheating, and heat is transferring to the oil*
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| show | Impeller and Diffuser
Impeller-speeds up the air/adds energy
Diffuser-Slows the air/increases pressure
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| show | -Support combustion
-Cool the engine
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| A Turbine Hot Section is most susceptible to what kind of damage? | show 🗑
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| During low-thrust ops, what can help stabilize compressor airflow? | show 🗑
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| What do Variable guide vanes and compressor bleed valves help prevent? | show 🗑
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| show | Prevent compressor stalls @ low thrust.
-Compressor RPM high relative to air flowing through, compressor blade AOA will become too high and surge/stall can occur. They adjust to the proper angle.
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| show | Bleed air valves (connected to fuel control) open to reduce back-pressure, letting more air into the engine
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| At what stage in a turbine engine are gas pressures the greatest? | show 🗑
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| The compression ratio of an Axial-flow compressor is a function of the _? | show 🗑
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| show | Higher compression ratios
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| What is the primary function of a Turbine Engine Exhaust cone? | show 🗑
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| The "Brayton cycle" is also known as the constant _ cycle. | show 🗑
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| show | Cycle of energy used by a turbine engine.
-Energy added to air by burning the fuel
-Volume of air increases
-Pressure remains relatively constant.
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| In a turbine engine, combustion occurs at a constant (volume/pressure/density) | show 🗑
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| Why are lead/wax/grease markings not used on Turbine engine hot sections? | show 🗑
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| In turbine hot sections, what are safe ways to mark components? | show 🗑
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| What does Newton's Second "Law of Momentum" State? | show 🗑
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| If ball/roller bearings are found to have any magnetism, what must be done? | show 🗑
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| show | Fluid wash
Abrasive grit blast
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| What 3 main sections make up a gas turbine engine? | show 🗑
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| A compressor stall is caused by a (low/high) angle of attack through the first compressor stages. | show 🗑
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| show | Velocity of the air through the engine
RPM of the compressor
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| What is the purpose of a diffuser in a turbine engine? | show 🗑
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| show | Re-Trim the engine
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| Why are turbine blades more susceptible to damage than compressor blades? | show 🗑
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| What are the 3 basic types of Combustion sections used on turbine engines? | show 🗑
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| show | Compressor Section
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| First-Stage turbine blades are found to have stress rupture cracks on the leading edges. This is a sign of a _ condition. | show 🗑
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| show |
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