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AMT1217
Turbine Engines
| Question | Answer |
|---|---|
| What are the three major functioning sections of the turbine engine? | Compressor, combustion, and turbine |
| Turbofan engines are categorized as: | High and low bypass |
| The two functional elements of a centrifugal-flow compressor are: | Impeller and diffuser |
| What section is located between the compressor and turbine sections? | Combustion |
| Name the principal types of compressors | centrifugal and axial |
| What constitutes a stage of compression in an axial flow compressor? | Rotor and stator |
| What does VIGV stand for? | Variable Inlet Guide Vanes |
| What are the three basic types of combustion chambers? | can, annular, and can-annular |
| What is the primary purpose of the turbine section? | Turn the compressor |
| What is the primary purpose of the combustion section? | Provide a place for the fuel/air to mix and burn |
| How are turbines blades attached to the turbine wheel? | Fir tree attachment |
| What type of bearings are used in the turbine engine? | ball and roller |
| How many igniters are normally in an aircraft turbine engine? | 2 |
| How are engine stresses transferred to the aircraft structure? | Engine mounts |
| What prevents oil from leaking past a labyrinth seal? | Positive air pressure |
| The Brayton cycle is known as what? | The constant pressure cycle |
| Where is the highest gas pressure in a gas turbine engine? | The entrance of the burner section |
| Where is the highest gas temperature in a gas turbine engine? | Inlet of the turbine |
| What type of ignition source is typically used in gas turbine engines? | High-energy capacitor discharge |
| What occurs at high altitude where low engine speeds and low fuel pressure form a weak flame that is extinguished in a normal airflow? | A lean die-out |
| When an engine reaches operating temperatures, do the turbine blades expand or contract? | Expand |
| If the kinetic energy of air flowing through a duct increases, the potential energy: | Decreases |
| What does EPR represent in turbofan-powered aircraft? | Thrust being produced |
| Fuel flow for a gas turbine engine is indicated in what measurement? | Pounds per hour |
| What must be followed when removing the propeller from a turboprop engine? | Manufacturer's instructions |
| The permanent deformation of turbine blades caused by high temperatures is known as: | Creep |
| What is the purpose of air passing through the combustion chamber of a turbine engine | supports combustion and cool the engine |
| What is the primary advantage of an axial-flow compressor over a centrifugal compressor? | Greater pressure ratios |
| What is the profile of a turbine engine compressor blade? | reduced blade tip thickness |
| How is the blending of blades and vanes performed? | Parallel to the length of the blade using smooth contours |
| In what section is the fuel and air mixed? | Combustion |
| Combustion occurs at a constant: | Pressure |
| What are not acceptable to any extent in turbine blades? | Cracks |
| Where is the turbine discharge pressure indicator sensor located | Immediately aft of the last turbine stage |
| Turbine engine tachometers are calibrated in what measure of units? | Percent of engine RPM |
| The development of a hard, glossy surface on bearing surfaces in the presence of oil, heat, and pressure is known as: | Glazing |
| Turbine nozzle diaphragms located on the upstream side of each turbine wheel, are used in the gas turbine engine to: | Increase the velocity of the heated gases |
| During inspection, engine components exposed to high temperatures may only be marked using: | Chalk |
| What are two basic elements of the turbine section in a turbine engine? | Rotor and stator |
| Who establishes mandatory replacement times for critical components of turbine engines? | Manufacturer |
| Who is authorized to overhaul turbine engines? | manufacturer or overhaul facility |
| Why should shop air never be used to dry a turbine bearing? | Shop air can cause corrosion |
| Visual inspection is accomplished using: | A light and magnifying glass |
| Where do stress rupture cracks usually appear on turbine blades? | Across the leading or trailing edge at a right angle to the edge length |
| What kind of turbine engine compressor has vanes on both sides of the impeller? | Double entry centrifugal compressor |
| Axial-flow compressors have what disadvantages? | high weight and high starting power requirements |
| A severe stall of a compressor wheel in a gas turbine engine is known as: | Hung stall |
| What section is divided into primary and secondary paths in order to properly function? | Combustion |
| The shape and size of the exhaust section and it's components has direct effect on: | Turbine Inlet Temperature |
| What is used to supply power to the aircraft when the engines are not running? | APU |
| Galling is caused by what? | Severe rubbing of turbine blades |
| How many magnetos are typically used on gas turbine engines? | 0 |
| What must be done before inspecting the engine nacelle? | Clean the nacelle |
| Before attaching a sling to an engine hoist, what must be done? | Check hoist capacity limits |
| Nozzles accomplish what two tasks? | Convert thermal energy into mechanical and direct gases to turbine blades |
| Creep is caused by: | Continued or excessive heat and centrifugal force |
| Inlet air density is affected by: | Ambient temperature, altitude, and speed of the aircraft |
| Thermal efficiency of the engine is affected by: | TIT, compression ratio, and turbine and compressor efficiency |
| Stress ruptures develop from: | excessive heat stress |
| A purpose of the shrouds on the turbine blades of an axial-flow engine is to: | Reduce vibration |
| Dirt particles in the air being introduced into the compressor of a turbine engine will not form a coating on: | Turbine blades |
| What is used to support some long fan blades making them more resistant to bending forces? | Mid-span shroud |
| When an excessively rich fuel/air mixture is ignited, it is known as: | A hot start |
| During a normal startup the engine fails to reach idle speed, this is known as: | A hung start |
| Fuel flow should be turned off and the engine should continue to be motored with starter when? | If a fire occurs during starting cycle |
| When shutting down a gas turbine engine, a 30 second idling is recommended why? | oil system scavenging and allow component temperatures to stabilize |
| What is takeoff power rating? | The amount of power an aircraft engine is permitted to produce during takeoff. |
| Maximum cruise power is also known as: | Maximum continuous power |
| Though TBO for the engine is not required of turbines, the manufacturer will require: | overhaul of individual components |
| Why do some turbine engines have more than one turbine wheel attached to a single shaft? | To extract more power |
| Hot streaking can be caused by: | A partially clogged fuel nozzle |
| Main bearing oil seals are usually what type? | Labyrinth and/or carbon rubbing |
| Increase pressure and reduce velocity is the purpose of what section? | Diffuser |
| Turbine blades are classified as: | impulse, reaction, and impulse-reaction |
| What is used to cool the components of the turbine section? | Engine bleed air |
| The jet nozzle provides the exhaust gases with a final boost in what? | Velocity |
| What increases thrust by accelerating exhaust gases? | Afterburners |
| Thrust reversers are used to assist turbojet or turbofan powered aircraft with what? | Braking |
| A force that tends to pull an object apart is known as: | Tension |
| Wing-mounted turbofan engines often have little ground clearance making them more vulnerable to: | Blade erosion |
| Stagnation density is a single variable combined from: | Temperature, altitude, and airspeed |
| Ultra-high bypass prop fan is known as: | UDB |
| Air entering the compressor must be: | slower than the speed of sound |
| What is used for cabin pressurization, air conditioning, fuel system deicing, and pneumatic engine starting? | Compressor bleed air |
| In a dual axial-flow compressor, the first stage turbine drives | the N2 compressor |
| A raised area indicating separation of a surface layer from a base metal is known as: | Blister |
| The formation of pockets on the surface of a metal is known as: | Pitting |
| High static loads cause rounded indentations in bearing races known as: | Brinelling |
| The condition that occurs when mid-span shrouds overlap from excessively worn mating surfaces is known as: | Shingling |
| The ratio of actual power produced divided by thermal energy in the fuel consumed is known as: | Thermal efficiency |
| An imbalance between inlet velocity and compressor rational speed is known as: | compressor stall |
Created by:
Ms.Fietzek
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