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Turbo Machinery MCQs Aeronautical Engineering)

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What is the primary function of a turbomachine? A) Convert mechanical energy into fluid energy B) Convert fluid energy into mechanical energy C) Cool the fluid D) Mix different fluids Answer: B) Convert fluid energy into mechanical energy Which type of turbomachine is used to increase the pressure of a gas? A) Turbine B) Compressor C) Pump D) Fan Answer: B) Compressor In a jet engine, the turbofan is primarily used to: A) Increase the velocity of the exhaust gases B) Compress the incoming air C) Convert the energy from combustion into thrust D) Increase the pressure of the incoming air Answer: D) Increase the pressure of the incoming air Which component of a turbojet engine is responsible for generating thrust? A) Compressor B) Combustion chamber C) Turbine D) Nozzle Answer: D) Nozzle In a centrifugal compressor, the primary mechanism for increasing pressure is: A) Radial acceleration of the fluid B) Axial acceleration of the fluid C) Mixing of different fluids D) Cooling of the fluid Answer: A) Radial acceleration of the fluid The ‘stator’ in a turbomachine refers to: A) The stationary component that guides the fluid B) The rotating component that imparts energy to the fluid C) The part that mixes fuel and air D) The component that cools the fluid Answer: A) The stationary component that guides the fluid In a turboprop engine, the propeller is driven by: A) The power produced by the turbine B) The power produced by the compressor C) The exhaust gases D) The incoming air Answer: A) The power produced by the turbine The ‘rotor’ in a turbomachine is: A) The rotating component that imparts energy to the fluid B) The stationary component that guides the fluid C) The part that mixes fuel and air D) The component that cools the fluid Answer: A) The rotating component that imparts energy to the fluid Which of the following turbomachinery types is characterized by a high-speed rotating impeller? A) Axial-flow compressor B) Centrifugal compressor C) Radial-flow turbine D) Fan Answer: B) Centrifugal compressor In an axial-flow turbine, the flow of the fluid is: A) Parallel to the axis of rotation B) Perpendicular to the axis of rotation C) Radial to the axis of rotation D) Circular around the axis of rotation Answer: A) Parallel to the axis of rotation The ‘efficiency’ of a turbomachine is typically defined as: A) The ratio of useful work output to the energy input B) The amount of heat produced C) The speed of rotation D) The size of the machine Answer: A) The ratio of useful work output to the energy input Which component in a turbomachine is responsible for converting mechanical energy into fluid energy? A) Impeller B) Nozzle C) Diffuser D) Stator Answer: A) Impeller In a turbocharger, the ‘turbine’ is used to: A) Drive the compressor using exhaust gases B) Increase the pressure of the incoming air C) Mix fuel and air D) Cool the engine components Answer: A) Drive the compressor using exhaust gases The ‘diffuser’ in a turbomachine helps to: A) Convert fluid velocity into pressure B) Increase fluid velocity C) Cool the fluid D) Mix different fluids Answer: A) Convert fluid velocity into pressure Which of the following turbomachinery types is commonly used in commercial jet engines? A) Turbofan B) Centrifugal pump C) Radial compressor D) Axial-flow pump Answer: A) Turbofan The ‘inlet guide vanes’ in a compressor are used to: A) Control the direction of the incoming airflow B) Increase the pressure of the outgoing air C) Mix fuel and air D) Cool the compressor components Answer: A) Control the direction of the incoming airflow Which turbomachine component helps to convert high-speed fluid flow into mechanical work? A) Turbine B) Compressor C) Nozzle D) Diffuser Answer: A) Turbine In an axial-flow compressor, the fluid flow direction is: A) Parallel to the axis of rotation B) Perpendicular to the axis of rotation C) Radial to the axis of rotation D) Tangential to the axis of rotation Answer: A) Parallel to the axis of rotation Which type of turbomachine is used primarily for power generation in aircraft? A) Turbojet B) Turboprop C) Turbofan D) Axial-flow pump Answer: C) Turbofan The ‘compressor’ in a gas turbine engine is used to: A) Increase the pressure of the incoming air B) Increase the temperature of the exhaust gases C) Generate thrust D) Cool the combustion chamber Answer: A) Increase the pressure of the incoming air Which turbomachine component helps to increase the velocity of exhaust gases? A) Nozzle B) Impeller C) Diffuser D) Stator Answer: A) Nozzle The ‘blades’ in a turbine are used to: A) Extract energy from the fluid and convert it into rotational work B) Increase fluid velocity C) Mix fuel and air D) Cool the turbine components Answer: A) Extract energy from the fluid and convert it into rotational work The ‘fan’ in a turbofan engine is used to: A) Increase the airflow through the engine B) Compress the incoming air C) Generate electrical power D) Cool the exhaust gases Answer: A) Increase the airflow through the engine Which type of compressor is known for its high efficiency in aircraft engines? A) Axial-flow compressor B) Centrifugal compressor C) Radial-flow compressor D) Diaphragm compressor Answer: A) Axial-flow compressor In a centrifugal compressor, the fluid is accelerated: A) Radially outward B) Axially forward C) Perpendicularly D) Tangentially Answer: A) Radially outward The ‘rotational speed’ of a turbomachine affects: A) The amount of work done on the fluid B) The temperature of the fluid C) The cooling efficiency D) The mass flow rate of the fluid Answer: A) The amount of work done on the fluid Which of the following turbomachinery components is used to regulate the flow of fluid into the rotor? A) Inlet guide vanes B) Diffuser C) Nozzle D) Exhaust Answer: A) Inlet guide vanes The ‘choking’ condition in a turbomachine occurs when: A) The fluid velocity reaches the speed of sound at the nozzle exit B) The compressor stalls C) The turbine blades overheat D) The fuel supply is insufficient Answer: A) The fluid velocity reaches the speed of sound at the nozzle exit Which component of a gas turbine engine converts the thermal energy of the exhaust gases into mechanical energy? A) Turbine B) Compressor C) Combustion chamber D) Nozzle Answer: A) Turbine In a turbojet engine, which component provides the primary source of thrust? A) The exhaust gases expelled through the nozzle B) The rotating blades in the compressor C) The combustion process D) The turbine Answer: A) The exhaust gases expelled through the nozzle The ‘compressor surge’ phenomenon is characterized by: A) A sudden drop in compressor pressure and flow B) An increase in exhaust temperature C) A rise in engine thrust D) A decrease in engine noise Answer: A) A sudden drop in compressor pressure and flow Which type of turbomachine is primarily used for low-speed, high-thrust applications? A) Turbojet engine B) Turboprop engine C) Turbofan engine D) Ramjet engine Answer: B) Turboprop engine In a gas turbine engine, the ‘afterburner’ is used to: A) Increase thrust by burning additional fuel B) Reduce noise levels C) Cool the exhaust gases D) Increase the pressure in the combustion chamber Answer: A) Increase thrust by burning additional fuel Which turbomachine component is responsible for directing the exhaust gases in a controlled manner? A) Nozzle B) Impeller C) Diffuser D) Stator Answer: A) Nozzle In a radial-flow turbine, the flow direction is: A) Radial to the axis of rotation B) Parallel to the axis of rotation C) Tangential to the axis of rotation D) Perpendicular to the axis of rotation Answer: A) Radial to the axis of rotation The ‘performance map’ of a turbomachine helps to: A) Determine the efficiency and operational limits B) Calculate the fuel consumption C) Design the engine casing D) Predict maintenance schedules Answer: A) Determine the efficiency and operational limits Which type of compressor is often used in small aircraft engines due to its simplicity? A) Centrifugal compressor B) Axial-flow compressor C) Radial-flow compressor D) Diaphragm compressor Answer: A) Centrifugal compressor In a turbofan engine, the ‘fan’ section provides: A) Thrust by moving a large volume of air B) Compression of the incoming air C) Cooling for the combustion chamber D) Energy for the turbine Answer: A) Thrust by moving a large volume of air The ‘bleed air’ system in a turbomachine is used for: A) Extracting air for various purposes, such as cabin pressurization or engine cooling B) Increasing the engine thrust C) Reducing the fuel consumption D) Cooling the exhaust gases Answer: A) Extracting air for various purposes, such as cabin pressurization or engine cooling The ‘turbopump’ in a rocket engine is used to: A) Pump fuel and oxidizer into the combustion chamber B) Increase the velocity of exhaust gases C) Compress the incoming air D) Cool the rocket engine Answer: A) Pump fuel and oxidizer into the combustion chamber The ‘regenerative cooling’ system in a turbomachine is designed to: A) Circulate the propellant or coolant to absorb heat B) Increase the engine thrust C) Improve fuel efficiency D) Reduce engine noise Answer: A) Circulate the propellant or coolant to absorb heat In a turbomachine, ‘struts’ are used to: A) Support and guide the flow of fluid between different components B) Increase the pressure of the fluid C) Generate thrust D) Cool the engine components Answer: A) Support and guide the flow of fluid between different components The ‘specific thrust’ of a jet engine is defined as: A) The thrust produced per unit of mass flow rate of the air B) The thrust produced per unit of fuel consumed C) The thrust produced per unit of engine weight D) The thrust produced per unit of engine volume Answer: A) The thrust produced per unit of mass flow rate of the air The ‘compressor stall’ occurs when: A) The airflow through the compressor is disrupted, causing a loss of compression B) The turbine blades overheat C) The fuel supply is cut off D) The exhaust gases are not expelled properly Answer: A) The airflow through the compressor is disrupted, causing a loss of compression

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