Aircraft Fuel Metering System
Aircraft Fuel Metering System Quiz
Test your knowledge on the intricacies of aircraft fuel metering systems with our comprehensive quiz! This set of 40 questions is designed for aviation enthusiasts and professionals alike.
Key Features:
- Multiple choice questions covering various aspects of fuel systems.
- Evaluate your understanding of both carburetor and fuel injection systems.
- Perfect for students and aviation professionals seeking to reinforce their knowledge.
What are the positions of the pressurization valve and the dump valve in a jet engine fuel system when the engine is shut down?
Pressurization valve closed, dump valve open.
Pressurization valve open, dump valve open
Pressurization valve closed, dump valve closed
An excessively lean fuel/air mixture may cause
An increase in cylinder head temperature.
High oil pressure.
Backfiring through the exhaust.
What carburetor component measures the amount of air delivered to the engine?
Economizer valve.
Automatic mixture control.
Venturi.
Select the correct statement concerning the idle system of a conventional float-type carburetor.
The low-pressure area created in the throat of the venture pulls the fuel from the idle passage.
Climatic conditions have very little effect on idle mixture requirements.
The low pressure between the edges of the throttle valve and the throttle body pulls the fuel from the idle passage.
On a float-float type carburetor, the purpose if the economizer valve is to
Provide extra fuel for sudden acceleration of the engine.
Maintain the leanest mixture possible during cruising best power.
Provide a richer mixture and cooling at maximum power output.
If the volume of air passing through a carburetor venturi is reduced, the pressure at the venturi throat will
Decrease.
Be equal to the pressure at the venturi outlet.
Increase.
The fuel metering force of a conventional float-type carburetor in its normal operating range is the difference between the pressure acting on the discharge nozzle located within the venturi and the pressure
Acting on the fuel in the float chamber.
Of the fuel as it enters the carburetor.
Of the air as it enters the venturi (impact pressure).
What should be checked/change to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?
Fuel specific gravity setting.
Maximum RPM adjustment.
EPR gauge calibration.
On an engine equipped with a pressure-type carburetor, fuel supply in the idling range is ensured by the inclusion in the carburetor of
A spring in the unmeters fuel chamber to supplement the action of normal metering forces.
An idle metering jet that bypasses the carburetor in the idle range.
A separate oat venturi that is sensitive to the reduced airflow at start and idle speeds
During Engine operation, if carburetor heat is applied, it will
Increase fuel/air ratio.
Increase engine RPM.
Decrease the air density to the carburetor.
A carburetor is prevented from leaning out during quick acceleration by the
Power enrichment system.
Mixture control system.
Accelerating system.
Why must a float-type carburetor supply a rich mixture during idle?
Engine operation at idle result in higher than normal volumetric efficiency.
Because at idling speeds the engine the engine may not have enough airflow around the cylinders to provide proper cooling.
Because of reduced mechanical efficiency during idle.
If a float-type carburetor leaks fuel when the engine is stopped, a likely cause is that the
Float needle valve is worm or otherwise not seated properly.
Float level is adjusted too low
Main air bleed is clogged
If the main air bleed of a float type carburetor becomes clogged, the engine will run
Lean at rated power.
Rich at rated power.
Rich at idling.
Detonation occurs when the fuel/air mixture
Burns too fast.
Iginites before the time of normal iginition
Is too rich
Which statement is correct regarding a continuous-flow fuel injection system used on many reciprocating engines?
Fuel is injected directly into each cylinder.
Fuel is injected at each cylinder intake port.
Two injector nozzle are used in the injector fuel system for various speeds.
What method is ordinarily used to make idle speed adjustments on a float type carburetor?
An adjustable throttle stop or linkage.
An orifice and adjustable tapered needle.
An adjustable needle in the drilled passageway which connects the airspace of the float chamber and the carburetor venturi.
During idle mixture adjustments, which of the following is normally observed to determine when the correct mixture has been achieved?
Changes in fuel/air pressure ratio.
Fuel flowmeter.
Changes in RPM or manifold pressure.
For what primary purpose is a turbine engine fuel control unit trimmed?
To obtain the maximum thrust output when desired.
To properly position the power levers.
To adjust the idle RPM.
If a float type carburetor becomes flooded, the condition is most likely caused by
A leaking needle valve and seat assembly.
The accelerating pump shaft being struck.
A clogged back-suction line.
A punctured float in a float type carburetor will cause the fuel level to
Lower, enrichment the mixture.
Rise, and enrich the mixture.
Rise, and lean the mixture.
What component is used to ensure fuel delivery during periods of rapid engine acceleration?
Acceleration pump.
Water-injection pump.
Power enrichment unit.
Which of the following is least likely to occur during operation of an engine equipped with a direct cylinder fuel injection system.
Afterfiring.
Kickback during start.
Backfiring.
A reciprocating engine automatic mixture control responds to changes in air density caused by changes in
Altitude or humidity.
Altitude only.
Altitude or temperature.
An aircraft carburetor is equipped with a mixture control in order to prevent the mixture from becoming too
Lean at high altitudes.
Rich at high altitudes.
Rich at high speeds.
When air passes through the venturi of a carburetor, what three changes occur?
Velocity increases, temperature increases, and pressure decreases.
Velocity decreases, temperature increases, and pressure increases.
Velocity increases, temperature decreases, and pressuredecreases
At what engine speed does the main metering jet actually function as a metering jet in a float type carburetor?
All RPM's.
Cruising RPM only.
All RPM's above idle range
What carburetor component actually limits the desired maximum airflow to the engine at full throttle?
Throttle valve.
Venturi.
Manifold intake.
An aircraft engine equipped with a pressure type carburetor is started with the
Primer while the mixture control is positioned at IDLE CUTOFF.
Mixture control in the FULL-RICH position.
Primer while the mixture-control is positioned at the FULL-LEAN position.
Which type of fuel control is used on most of today's turbine engines?
Electromechanical.
Mechanical.
Hydromechanical or electronic
Where is the throttle valve located on a float-type carburetor?
Between the venturi and the discharge nozzle.
After the main discharge nozzle and venturi.
After the venturi and just before the main discharge nozzle.
The use of less than normal throttle opening during starting will cause
A rich mixture.
A lean mixture.
Backfire due to lean fuel/air ratio.
The desired engine idle speed and mixture setting
Is adjusted with the engine warmed up and operating.
Should give minimum RPM with maximum manifold pressure.
Is usually adjusted in the following sequence; speed first, the mixture.
What is the relationship between the accelerating pump and the enrichment valve in a pressure injection carburetor?
No relationship since they operate independently
Unmetered fuel pressure affects both units.
The accelerating pump actuates in the enrichment valve.
The throttle valve of float-type aircraft carburetors is located
Ahead of the venturi and main discharge nozzle.
After the main discharge nozzle and ahead of the venturi.
Between the venturi and the engine.
If the main air bleed of a float type carburetor becomes clogged and the engine will run
Lean at rated power.
Rich at rated power.
Rich at idling.
Which method is commonly used to adjust the level of a float in a float type carburetor?
Lengthening or shortening the float shaft.
Add or remove shims under the needle-valve seat.
Change the angle of float arm pivot.
During the operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon the
Air temperature.
Barometric pressure.
Air velocity.
What corrective action should be taken when a carburetor is found to be leaking fuel from the discharge nozzle?
Replace the needle valve and seat.
Raise the float level.
Turn the fuel off each time the aircraft is parked.
Fuel is discharged for idling speeds on a float-type carburetor
From the idle discharge nozzle.
In the venturi.
Through the idle discharge air bleed.
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