Powerplant Fuel Metering Systems

Front 1

Where does the fuel metering system of a turbine engine discharge it's fuel?

Back 1

Through the fuel nozzles into the combustion chamber

Front 2

What is adjusted when the fuel control unit of a turbine engine is trimmed?

Back 2

Idle speed and maximum thrust speed

Front 3

What are two locations water maybe injected into a turbine engine?

Back 3

Compressor inlet and inlet of diffuser section

Front 4

What is meant by a duplex nozzle in a turbine engine fuel metering system?

Back 4

It's a system with two discharge nozzles one to supply fuel for low pressure operations, and the other will provide fuel when the engine demands more fuel. This spray patrern keeps the flame centered in the burner for all operation conditions

Front 5

What is the function of the float carburetor?

Back 5

It measures the air flow, and the amount of fuel into the airflow for all engine operating parameters and conditions, it also vaporizes the fuel by the time ignition occurs in the engine cylinders

Front 6

Does the fuel air mixture provided by the float carburetor become richer or leaner as the aircraft goes up in altitude?

Back 6

Richer if it's not adjusted

Front 7

Does the fuel-air mixture provided by a float carburetor become richer or leaner when carburetor heat is applied?

Back 7

Richer, as the mixture has less dense air due to the carburetor heat

Front 8

What would happen to the fuel-air mixture ratio in a float carburetor if the main bleed where to become plugged?

Back 8

It will become excessively rich as less air is added into the mixture

Front 9

How does the automatic mixture control in a pressure carburetor keep the fuel-air mixture constant as the aircraft changes attitude?

Back 9

It automatically, and progressively bleeds the air between the two sides of the diaphragm and decreases the air metering Force this leans the mixture as the aircraft ascends in altitude

Front 10

What are two functions of the manifold valve or flow divider in the fuel injector system of a horizontally opposed aircraft engine?

Back 10

Provide the constant discharge pressure for idling, and the positive shotoff when the engine is shut down

Front 11

How does a mixture control change the fuel-air mixture ratio on the Teledyne-Continental fuel injection system?

Back 11

When the mixture control is in its full Rich position, fuel goes to the manifold valve, in the idle cut off position all the fuel is returned to the pump inlet, and intermediate positions vary the amount of fuel that goes into the engine.

Front 12

Why must the diaphragm of a pressure carburetor be soaked before the carburetor is ready for flight?

Back 12

Soaking restores them to the condition of flexibility just as when it was calibrated

Front 13

What are two basic types of fuel controls for aircraft turbine engines?

Back 13

Hydro-pneumatic and electro-hydromechanical

Front 14

How does the exhaust gas temperature of reciprocating engine tell anything about the fuel-air mixture being burned by the engine?

Back 14

A stoichiometric mixture or an ideal mixture in which all the constituents of the fuel air mixture are burned to give the highest EGT, and then it's enriched to keep it on the rich side of the stoichiometric

Front 15

What two things are adjusted when adjusting the idling of a reciprocating engine?

Back 15

The throttle stop for the proper idling RPM and the idle mixture control to get the smoothest operation

Front 16

What is controlled by the adjustment of the orifice in the fuel pump of a Teledyne-Continental fuel injection system?

Back 16

The high unmetered fuel pressure

Front 17

What is the significance of the letters that are stamped on the flats of a fuel injection nozzle?

Back 17

It signifies the relative size of the injector nozzle, the lower the letters in the alphabet signifies the smaller amount of fuel the nozzle will flow

Front 18

What is the function of the the de-richment valve in a pressure carburetor used on an aircraft engine with an anti-detonation injection system?

Back 18

It closes automatically to lean the fuel-air mixture when ADI fluid is flowing and opens once the ADI fluid stops for return to regular enrich conditions

Front 19

What is the function of the economizer system in aircraft engine carburetors?

Back 19

It allows the engine to operate with an economically lean mixture for all conditions except under full power

Front 20

And what position is the mixture controlled placed for starting an engine that is equipped with a pressure carburetor?

Back 20

The idle cut off position as the engine is started with the fuel from the primer system

Front 21

In what position is the carburetor heat control placed when starting an aircraft engine?

Back 21

The cold position

Front 22

Why is an aircraft reciprocating engine shut off by placing the mixture control in the cutoff position, and not by using the magneto switch?

Back 22

Shutting off fuel in the cylinders in the combustion Chambers are left full of air with no fuel, this makes the engine less likely to fire if the propeller is pulled through with ignition switch accidentally on

Front 23

Where is the fuel from a continuous fuel flow injection system discharged?

Back 23

Through the injector nozzles screwed into the cylinder heads near the intake valves

Front 24

In what direction relative to the wind should the turbine powered aircraft be positioned when fuel control is trimmed?

Back 24

In any direction if the wind is less than 10 miles per hour,above 10 to 25 miles per hour it should be in the direction of the wind, do not trim if the wind speed is above 25 miles per hour

Front 25

What engine parameters are sensed by fuel control unit of a turbine engine?

Back 25

The engine RPM, inlet air pressure, compressor discharge pressure, the burner can pressure, and the inlet air temperature

Front 26

When does the acceleration system operate on an aircraft carburetor?

Back 26

When the throttle is suddenly opened