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WorksheetsCombustion and Turbine Section in Turbofan Engines
Total questions: 15
Worksheet time: 8mins
What is the thermodynamic cycle used in Turbofan engines?
Carnot
Rankine
Brayton
Otto
What type of combustion chamber is most common in engines with centrifugal compressors?
Can
Annular
Can-annular
Tubular
What is one of the advantages of the annular combustion chamber?
Greater weight
Lower combustion efficiency
Less cooling air required
Flame propagation issues
What is used to transfer the flame between the combustion chambers in the Can type?
Interconnecting tubes
Auxiliary compressors
Ignition sensors
Sealing rings
What is the typical stoichiometric ratio between air and fuel in the combustion chamber?
10:1
15:1
20:1
25:1
What phenomenon occurs when the turbine blades stretch due to high temperatures?
Compression
Creep
Fatigue
Torsion
What are the stationary vanes that direct the gas flow towards the turbine blades called?
Rotor blades
Stator blades
Cooling fins
Sealing rings
What is the main purpose of turbines in a gas turbine engine?
Increase the speed of the aircraft
Extract thermal energy and convert it to mechanical energy
Increase air pressure
Generate electricity
What type of turbine combines impulse and reaction characteristics?
Impulse
Reaction
Impulse-reaction
Centrifugal
What material is commonly used for turbine blades due to high temperatures?
Aluminum
Titanium
Stainless steel
Nickel alloys
What system is used to control the space between the tips of the blades and the turbine casing?
Compression system
Active space control system
Continuous ignition system
Active combustion system
What happens if residual fuel is not removed before the next engine start?
Engine efficiency is reduced
An explosion occurs in the combustion chamber
A fire jet is generated in the turbine region
The engine does not start
What is used to minimize gas leakage losses through the tips of the turbine blades?
A sealing ring
An ignition system
An annular combustion chamber
An active cooling system
What happens during combustion stability under normal engine operating conditions?
The ignition system remains activated
The ignition system turns off
All combustion chambers need to be ignited
The engine must be continuously restarted
What is the energy converted in the turbine rotor blades called?
Thermal energy
Potential energy
Kinetic energy
Mechanical energy
