Combustion and Turbine Section in Turbofan Engines

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