Propulsion Systems MCQs Aeronautical Engineering

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Which of the following is a primary component of a jet engine? A) Turbine B) Wing C) Fuselage D) Empennage Answer: A) Turbine In a turbojet engine, the process of compressing air is performed by: A) Compressor B) Turbine C) Afterburner D) Nozzle Answer: A) Compressor The main function of the afterburner in a jet engine is to: A) Increase thrust B) Compress air C) Cool the engine D) Reduce noise Answer: A) Increase thrust Which component of a turbojet engine accelerates the exhaust gases to produce thrust? A) Nozzle B) Compressor C) Combustor D) Fan Answer: A) Nozzle A turbofan engine is characterized by: A) A large fan in front of the compressor B) No moving parts C) A single stage of compression D) High speed and low efficiency Answer: A) A large fan in front of the compressor The Brayton cycle is used to describe the operation of: A) Turbojet engines B) Turboprop engines C) Ramjet engines D) Rocket engines Answer: A) Turbojet engines In a turboprop engine, the power generated by the engine is used to: A) Drive a propeller B) Produce thrust directly C) Compress air D) Generate electrical power Answer: A) Drive a propeller The primary advantage of a turboprop engine over a turbojet engine is: A) Greater fuel efficiency at lower speeds B) Higher thrust-to-weight ratio C) Higher maximum speed D) Greater simplicity Answer: A) Greater fuel efficiency at lower speeds A ramjet engine operates most efficiently at: A) High speeds B) Low speeds C) Ground level D) Low altitudes Answer: A) High speeds The main advantage of a scramjet engine over a ramjet is: A) Ability to operate at hypersonic speeds B) Simplicity of design C) Lower fuel consumption D) Greater thrust at low speeds Answer: A) Ability to operate at hypersonic speeds In a turbojet engine, which component is responsible for adding fuel to the compressed air? A) Combustor B) Turbine C) Nozzle D) Fan Answer: A) Combustor The purpose of the turbine in a jet engine is to: A) Extract energy from the exhaust gases to drive the compressor B) Compress air before combustion C) Mix fuel with air D) Direct the exhaust gases out of the engine Answer: A) Extract energy from the exhaust gases to drive the compressor Which of the following engines uses a nozzle to achieve propulsion? A) Rocket engine B) Turboprop engine C) Diesel engine D) Electric motor Answer: A) Rocket engine The specific fuel consumption (SFC) of an engine is defined as: A) The amount of fuel consumed per unit of thrust or power B) The total amount of fuel consumed over time C) The volume of fuel consumed per unit of distance D) The rate of fuel flow through the engine Answer: A) The amount of fuel consumed per unit of thrust or power A high-bypass turbofan engine has: A) A large fan and a relatively small core engine B) A small fan and a large core engine C) No fan D) A single-stage compressor Answer: A) A large fan and a relatively small core engine The term ‘thrust-to-weight ratio’ refers to: A) The ratio of an engine’s thrust to its weight B) The ratio of the aircraft’s weight to its thrust C) The amount of thrust produced per unit of fuel D) The ratio of thrust to drag Answer: A) The ratio of an engine’s thrust to its weight The primary function of the compressor in a jet engine is to: A) Increase the pressure of incoming air B) Extract energy from exhaust gases C) Mix fuel with air D) Direct the flow of exhaust gases Answer: A) Increase the pressure of incoming air In a turboprop engine, the propeller is driven by: A) A turbine B) A compressor C) A ramjet D) A nozzle Answer: A) A turbine The efficiency of a turbofan engine is generally higher than that of a turbojet engine at: A) Subsonic speeds B) Supersonic speeds C) Low altitudes D) High altitudes Answer: A) Subsonic speeds The primary difference between a turbojet and a turbofan engine is: A) The presence of a large fan in the turbofan engine B) The type of fuel used C) The method of cooling D) The engine’s weight Answer: A) The presence of a large fan in the turbofan engine In a ramjet engine, the combustion process occurs: A) At supersonic speeds B) At subsonic speeds C) During the entire flight D) Only at takeoff Answer: A) At supersonic speeds The ‘compressor stall’ in a jet engine is: A) A condition where the compressor fails to deliver adequate airflow B) A malfunction of the turbine C) An issue with the engine’s fuel system D) A problem with the afterburner Answer: A) A condition where the compressor fails to deliver adequate airflow Which type of engine is often used in military supersonic aircraft for its high-speed capability? A) Turbojet engine B) Turboprop engine C) Ramjet engine D) Electric motor Answer: C) Ramjet engine The primary role of the combustor in a jet engine is to: A) Burn the fuel-air mixture to produce high-energy exhaust B) Compress the incoming air C) Extract power to drive the compressor D) Direct the flow of exhaust gases Answer: A) Burn the fuel-air mixture to produce high-energy exhaust The ‘turbine blade’ in a jet engine is responsible for: A) Extracting energy from the high-pressure exhaust gases B) Compressing the incoming air C) Mixing the fuel with the air D) Cooling the engine Answer: A) Extracting energy from the high-pressure exhaust gases In a high-bypass turbofan engine, the bypass ratio is: A) The ratio of the mass of air bypassing the engine core to the mass of air passing through the core B) The ratio of thrust produced to fuel consumed C) The ratio of the fan diameter to the engine core diameter D) The ratio of engine weight to thrust produced Answer: A) The ratio of the mass of air bypassing the engine core to the mass of air passing through the core Which propulsion system uses a nozzle to accelerate exhaust gases for thrust? A) Rocket engine B) Turbofan engine C) Diesel engine D) Electric propulsion system Answer: A) Rocket engine The ‘specific thrust’ of an engine is: A) The thrust produced per unit of engine airflow B) The total thrust produced by the engine C) The thrust produced per unit of fuel consumed D) The thrust-to-weight ratio of the engine Answer: A) The thrust produced per unit of engine airflow Which of the following engines is most suitable for use in commercial airliners? A) Turbofan engine B) Turbojet engine C) Ramjet engine D) Rocket engine Answer: A) Turbofan engine The ‘thrust reverser’ in an aircraft engine is used to: A) Increase braking force during landing B) Enhance fuel efficiency C) Improve climb performance D) Reduce noise Answer: A) Increase braking force during landing The main purpose of an afterburner in a jet engine is to: A) Increase thrust without significantly increasing fuel consumption B) Reduce engine noise C) Improve fuel efficiency D) Cool the engine Answer: A) Increase thrust without significantly increasing fuel consumption Which of the following types of engines is typically used in space exploration? A) Rocket engine B) Turbofan engine C) Turbojet engine D) Turboprop engine Answer: A) Rocket engine The ‘turboprop engine’ is distinguished by: A) A turbine driving a propeller B) A large fan in front of the compressor C) The use of afterburners D) The absence of a compressor Answer: A) A turbine driving a propeller Which component of a jet engine is designed to reduce the temperature of exhaust gases? A) Nozzle B) Turbine C) Combustor D) Fan Answer: A) Nozzle The ‘compressor ratio’ of an engine is defined as: A) The ratio of the pressure of the air leaving the compressor to the pressure of the air entering the compressor B) The ratio of fuel consumption to thrust produced C) The ratio of the engineā€™s weight to thrust D) The ratio of thrust to drag Answer: A) The ratio of the pressure of the air leaving the compressor to the pressure of the air entering the compressor The ‘engine cycle’ that describes the operation of a jet engine is: A) Brayton cycle B) Otto cycle C) Diesel cycle D) Stirling cycle Answer: A) Brayton cycle Which engine type is known for its high-speed performance and is used in supersonic aircraft? A) Turbojet engine B) Turboprop engine C) Ramjet engine D) Electric motor Answer: A) Turbojet engine The ‘engine thrust’ is the result of: A) The high-speed expulsion of exhaust gases B) The compression of air by the compressor C) The mixing of fuel and air in the combustor D) The power generated by the turbine Answer: A) The high-speed expulsion of exhaust gases The ‘fan blade’ in a turbofan engine is responsible for: A) Moving a large mass of air around the engine core B) Compressing the air C) Burning the fuel D) Extracting energy from the exhaust gases Answer: A) Moving a large mass of air around the engine core The ‘thrust-to-weight ratio’ of an engine affects: A) The engineā€™s performance and acceleration B) The engineā€™s fuel efficiency C) The size of the engine D) The engineā€™s noise levels Answer: A) The engineā€™s performance and acceleration The ‘jet propulsion’ principle relies on: A) Newtonā€™s third law of motion B) Bernoulliā€™s principle C) Archimedesā€™ principle D) Pascalā€™s principle Answer: A) Newtonā€™s third law of motion Which component in a jet engine converts high-energy exhaust gases into thrust? A) Nozzle B) Combustor C) Turbine D) Compressor Answer: A) Nozzle The primary disadvantage of a ramjet engine is: A) It cannot operate efficiently at low speeds B) It requires complex fuel systems C) It has high fuel consumption D) It is not suitable for high-speed flight Answer: A) It cannot operate efficiently at low speeds Which type of propulsion system is generally used for vertical takeoff and landing (VTOL) aircraft? A) Jet engine with thrust vectoring B) Turboprop engine C) Ramjet engine D) Rocket engine Answer: A) Jet engine with thrust vectoring The ‘specific thrust’ of an engine is a measure of: A) Thrust per unit of airflow through the engine B) Thrust per unit of fuel consumed C) Total thrust produced by the engine D) Engine weight relative to thrust Answer: A) Thrust per unit of airflow through the engine In a turbofan engine, the bypass ratio influences: A) The fuel efficiency and noise levels of the engine B) The maximum speed of the aircraft C) The engineā€™s thrust-to-weight ratio D) The engineā€™s maximum altitude capability Answer: A) The fuel efficiency and noise levels of the engine The ‘engine cooling’ system in a jet engine is responsible for: A) Maintaining the optimal temperature for engine components B) Increasing the air pressure C) Enhancing the fuel combustion process D) Directing the exhaust gases out of the engine Answer: A) Maintaining the optimal temperature for engine components The ‘thrust augmentation’ technique involves: A) Increasing thrust by adding extra fuel or using afterburners B) Reducing engine weight C) Decreasing air pressure in the combustion chamber D) Improving engine aerodynamics Answer: A) Increasing thrust by adding extra fuel or using afterburners The ‘turbocharger’ in a jet engine is used to: A) Increase the engineā€™s air intake pressure B) Reduce the engineā€™s noise C) Cool the engine D) Control the engineā€™s thrust output Answer: A) Increase the engineā€™s air intake pressure In a jet engine, the ‘exhaust nozzle’ is used to: A) Accelerate the flow of exhaust gases to produce thrust B) Mix air and fuel C) Compress incoming air D) Cool the engine components Answer: A) Accelerate the flow of exhaust gases to produce thrust

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