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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