GTS MOD2 Spur Gear Pump Configuration Quiz

Play an AI-generated podcast conversation about this lesson

What component of the fuel pump gives an initial pressure increase and pumps fuel to the gear elements?

Impeller (correct)

Shear section

Relief valve

Check valve

Why are shear sections incorporated into the drive system of each gear element?

To mix fuel with air

To prevent fuel recirculation

To create additional pressure

To allow for independent operation if one element fails (correct)

What is the purpose of the check valves in the fuel pump system?

To increase pressure

To control fuel flow rate

To prevent recirculation through the inoperative element (correct)

To mix fuel with air

Why is one element of the duplex spur gear pump capable of supplying sufficient fuel for most engine demands?

It has a larger capacity Signup and view all the answers

What happens to excess fuel not required by the engine in the fuel pump system?

It is recirculated to the inlet side of the gear elements Signup and view all the answers

Which component allows for the recirculation of excess fuel in the fuel pump system?

Relief valve Signup and view all the answers

In the duplex spur gear pump assembly, how many gear elements are present?

Two Signup and view all the answers

What role does the relief valve play in the fuel pump system?

To relieve excess pressure from the system Signup and view all the answers

What happens to the inlet ram air pressure and mass airflow when an aircraft increases in speed or descends?

Increase Signup and view all the answers

In governed operation, when the engine speed is set and not changed, what variables can affect the engine's operation?

Altitude and airspeed Signup and view all the answers

What senses the changes in inlet air pressure and mass airflow during aircraft speed or altitude changes?

Inlet and burner pressure bellows Signup and view all the answers

During descent or slowing down, what happens to the inlet air pressure and mass airflow?

Decrease Signup and view all the answers

What is the role of the multiplying lever during governed operation of the engine?

Maintain the air/fuel mixture ratio Signup and view all the answers

How does the engine react to changes in aircraft speed or altitude during steady operation?

Adjust air/fuel mixture automatically Signup and view all the answers

What is set at a certain position and not changed during governed operation of the engine?

Engine speed Signup and view all the answers

Which component of the engine moves in response to changes in inlet air pressure and mass airflow?

Multiplying lever Signup and view all the answers

What does the spring located in the downstream side of the control piston do?

Maintains a pressure differential of 100 PSI Signup and view all the answers

How does the control piston act upon the ball valve?

Modifies its action Signup and view all the answers

What happens to the pressure differential across the throttle as inlet pressure decreases?

It decreases Signup and view all the answers

During engine start, what does the pump servo piston spring do?

Moves the pump cam-plate to full deflection Signup and view all the answers

Where does fuel flow during engine start, passing through the throttle valve?

To the FCU Signup and view all the answers

What is the initial position of the throttle at rest?

Fully retarded Signup and view all the answers

What does the spring do when the control piston senses no differential pressure?

Closes the spill valve Signup and view all the answers

What does the supervisory electronic engine control system do?

Limits fuel flow based on TGT, N1, and N2 compressor speeds Signup and view all the answers

Which signals does the control amplifier receive in the system?

Turbine gas temperature (TGT) and two compressor speed signals (N1 and N2) Signup and view all the answers

How does the pressure regulator function in this system?

Regulates fuel pressure at the fuel pump Signup and view all the answers

At what point does the electronic circuit start to function as a fuel limiting device in this system?

Near full power Signup and view all the answers

What happens when predetermined TGT and compressor speed values are reached in this system?

The pressure regulator reduces fuel flow to the spray nozzles Signup and view all the answers

Which signals does the fuel flow regulator receive in this control system?

High speed compressor (N3), gas path pressure (P1, P2, P4), and power lever position Signup and view all the answers

How does the fuel flow regulator adjust fuel flow in this system?

Based on signals from high speed compressor, gas path pressure, and power lever position Signup and view all the answers

What does the electronic circuit start to function as when near full power is reached?

A fuel limiting device Signup and view all the answers

Where is the fuel flow transmitter typically located?

In the fuel manifold, just upstream of the fuel nozzles Signup and view all the answers

What does a fuel flow transmitter measure?

Amount of fuel consumed by an engine per hour Signup and view all the answers

What can higher than normal fuel consumption in one engine compared to another indicate?

Underperforming engine Signup and view all the answers

Which type of transmitter is shown in Figure 30?

Rotating vane transmitter Signup and view all the answers

What does the vane in the rotating vane transmitter carry at one end?

Ring-type magnet Signup and view all the answers

What type of output signal does the fuel flow transmitter produce?

Electrical signal Signup and view all the answers

Why are fuel flow transmitters used in multi-engine aircraft?

For engine troubleshooting and condition monitoring Signup and view all the answers

What does a higher than normal fuel consumption for a given power setting suggest?

'Under-performing engine' warning may be appropriate Signup and view all the answers

Which part of the fuel flow transmitter forms a magnetic coupling with the electrical transmitting unit?

'Ring-type magnet' Signup and view all the answers

What kind of device is a fuel flow transmitter?

Electro-mechanical Signup and view all the answers