ToF/Prop

A detailed illustration of helicopter rotor dynamics and gas turbine engine components, showcasing the mechanics of aviation propulsion in action.

Aviation Propulsion Mastery Quiz

Test your knowledge on aviation propulsion systems, gas turbine engines, and helicopter mechanics with our comprehensive quiz. Designed for aviation enthusiasts and professionals alike, this quiz contains 21 questions to challenge your understanding of key concepts.

Topics covered include:

Propelling nozzles
Gas turbine engine components
Lubrication systems
Helicopter rotor mechanics
Fuel and Oil management

21 Questions5 MinutesCreated by FlyingSky299

What type of propelling nozzle is used for supersonic flight?

Fixed convergent nozzle

Fixed divergent nozzle

Variable geometry nozzle

Convergent nozzle

The solution to phase lag is to __________.

Increase pitch and increase the engine RPM

Advance the angle of pitch change at the correct point in the blade's rotation

Allow angular movement of the blades above or below the plane of the hub

Allow 'play' in the plane of rotation and restrict it with damping devices

What type of gas turbine engine is usually used on helicopters?

Turbojet engine

Turboprop or turbo-propeller engine

Turbofan engine

Turboshaft engine

What type of oil is used for gas turbine engine lubrication system?

Synthetic oil

Vegetable oil

Mineral oil

Fatty oil

The coning angle ________.

Remains the same with the increase of the main rotor RPM

Increases with the decrease of main rotor RPM

Increases with the increase of the main rotor RPM

Does not depend on the main rotor RPM

To resolve uneven blade loading, the solution is to have built-in twist with ____________.

Pitch angle increasing towards blade tip

Pitch angle decreasing towards blade root

Pitch angle remains the same throughout the blade

Pitch angle decreasing towards blade tip

What is the primary function of the low pressure valve?

To supply fuel at the correct pressure and quantity during engine operation

To cut off the fuel supply during normal engine shut-down

To supply fuel to the engine at the correct pressure during start up

To enable the engine and the fuel system to be isolated from the aircraft fuel tanks during servicing or in the event of fire

How does a turboprop engine produce its thrust?

By accelerating a large mass of air at lower velocity

By accelerating a small mass of air at much higher velocity

By accelerating a large mass of air at a much higher velocity

By accelerating a small mass of air at a lower velocity

Some oil tanks are pressurized to?

Prevent the admission of dirt into the tank

Ensure a constant supply of oil to the pressure pump

Increase the temperature of the oil

Prevent the admission of air into the tank

What must be done to prevent the helicopter from hovering with one wheel low?

The tail rotor thrust must be higher than the main rotor biasing force

The main rotor thrust must be higher than the tail rotor biasing force

The tail rotor and main rotor must not be along the same horizontal plane

The tail rotor thrust and main rotor biasing force must act along the same horizontal plane

The function of the diffuser section of the centrifugal compressor is to?

Act as a rotating guide vane to guide the air into the combustion chamber

Convert the kinetic energy of the air into pressure energy

Straighten the airflow into the combustion chamber

Impart centrifugal energy to the air and increase its velocity

What is the primary function of the fuel heater?

To ensure fuel is supplied to the engine at the correct pressure and quantity

To control the pressure of the fuel

To heat and control the temperature of the fuel

To cool and control the temperature of the fuel

What is the primary function of the oil pressure pump?

To separate air from the oil after lubrication

To drain oil from the various parts of the engine after lubrication

To supply oil under pressure to the parts of the engine that require lubrication

To increase the temperature of the oil

The role of the compressor in a gas turbine engine is to?

Provide low pressure air to supercharge the high pressure compressor

Convert the pressure energy in the air into mechanical work to drive the engine accessories

Create a suction so that the air can flow through the engine easily

Provide high pressure air which can be heated in the combustion chamber and then expanded through the turbine

When the helicopter is hovering, the thrust produced by the tail rotor is __________.

Equal to the helicopter torque reaction

Less than the helicopter torque reaction

More than the helicopter torque reaction

Not related to the helicopter torque reaction

What is fitted into the gas turbine engine lubrication system to provide a warning impending failure of a component?

Oil jets

Chip detectors

Oil pumps

Oil coolers

Semi-rigid rotors improves the performance and control ability of the helicopter ___________.

But require complicated control system to resolve the blade flapping problem

And does not require any additional control system to resolve the blade flapping problem

But require a simplified control system to resolve the blade flapping problem

None of the above/below

When a helicopter cyclic stick is moved forward, the main rotor blades will change their pitch angles continuously throughout each revolution. This is known as __________.

Free wheeling

Main rotor biasing

Cyclic pitch change

Collective pitch change

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