Fuel Metering System

45問 • 1年前

Marga

通報

問題一覧

If the main air bleed of a float-type carburetor becomes clogged, the engine will run

rich at rated power.

One of the best ways to increase engine power and control detonation and pre-ignition is to

use water injection.

One purpose of an air bleed in a float-type carburetor is to

decrease fuel density and destroy surface tension.

An excessively lean fuel/air mixture may cause

an increase in cylinder head temperature.

When checking the idle mixture on a carburetor, the engine should be idling normally, then pull the mixture control toward the IDLE CUTOFF position. A correct idling mixture will be indicated by

an increase of 10 to 50 RPM before decreasing.

Detonation occurs when the fuel/air mixture

burns too fast.

What component is used to ensure fuel delivery during periods of rapid engine acceleration?

Acceleration pump

In order to stabilize cams, springs, and linkages within the fuel control, manufacturers generally recommend that all final turbine engine trim adjustments be made in the

increase direction

If the idling jet becomes clogged in a float-type carburetor, the

engine will not idle.

A carburetor is prevented from leaning out during quick acceleration by the

accelerating system

For what primary purpose is a turbine engine fuel control unit trimmed?

To obtain maximum thrust output when desired.

What is the relationship between the pressure existing within the throat of a venturi and the velocity of the air passing through the venturi?

The pressure is inversely proportional to the velocity.

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.

A major difference between the Teledyne-Continental and RSA (Precision Airmotive or Bendix) continuous flow fuel injection systems in fuel metering is that the

Continental system uses fuel pressure only as a metering force.

(1) The mixture used at rated power in air cooled reciprocating engines is richer than the mixture used through the normal cruising range. (2) The mixture used at idle in air cooled reciprocating engines is richer than the mixture used at rated power. Regarding the above statements,

both No. 1 and No. 2 are true.

Generally, the practice when trimming an engine is to

turn all accessory bleed air off.

The device that controls the volume of the fuel/air mixture to the cylinders is called a

throttle valve

During engine operation, if carburetor heat is applied, it will

decrease the air density to the carburetor.

A nine-cylinder radial engine, using a multiple-point priming system with a central spider, will prime which cylinders?

One, two, three, eight, and nine.

What effect does high atmospheric humidity have on the operation of a jet engine?

Has little or no effect.

The throttle valve of float-type aircraft carburetors is located

between the venturi and the engine.

On a float-type carburetor, the purpose of the economizer valve is to

provide a richer mixture and cooling at maximum power output.

In turbine engines that utilize a pressurization and dump valve, the dump portion of the valve

drains the engine manifold lines to prevent fuel boiling and subsequent deposits in the lines as a result of residual engine heat (at engine shutdown).

If a float-type carburetor becomes flooded, the condition is most likely caused by

a leaking needle valve and seat assembly.

Which of the following is NOT an input parameter for a turbine engine fuel control unit?

Ambient humidity

An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a

False high compression and turbine discharge pressure, and a subsequent low trim.

When troubleshooting an engine for too rich a mixture to allow the engine to idle, what would be a possible cause?

Economizer valve not operating correctly.

An aircraft engine equipped with a pressure-type carburetor is started with the

primer while the mixture control is positioned at IDLE CUTOFF.

The back-suction mixture control system operates by

varying the pressure acting on the fuel in the float chamber.

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 unmetered fuel chamber to supplement the action of normal metering forces.

What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?

Fuel specific gravity setting.

The device that controls the ratio of the fuel/air mixture to the cylinders is called a

mixture control

Select the statement which is correct relating to a fuel level check of a float-type carburetor.

Do not measure the level at the edge of the float chamber.

If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the fuel/air mixture will become

richer as either the altitude or temperature increases.

An aircraft engine continuous cylinder fuel injection system normally discharges fuel during which stroke(s)?

All (continuously)

What carburetor component actually limits the desired maximum airflow to the engine at full throttle?

Venturi

The desired engine idle speed and mixture setting

is adjusted with engine warmed up and operating.

An indication that the optimum idle mixture has been obtained occurs when the mixture control is moved to IDLE CUTOFF and manifold pressure

decreases and RPM increases momentarily before the engine ceases to fire.

Which method is commonly used to adjust the level of a float in a float-type carburetor?

Add or remove shims under the needle-valve seat.

Under which of the following conditions will the trimming of a turbine engine be most accurate?

No wind and low moisture.

What factor is not used in the operation of an aircraft gas turbine engine fuel control unit?

Mixture control position.

Which statement is correct regarding a continuous-flow fuel injection system used on many reciprocating engines?

Fuel is injected at each cylinder intake port.

At what engine speed does the main metering jet actually function as a metering jet in a float-type carburetor?

All RPM’s above idle range.

When a new carburetor is installed on an engine,

the engine is warmed up to normal temperatures, adjust the idle mixture, then the idle speed.

What carburetor component measures the amount of air delivered to the engine?

Venturi

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問題一覧

If the main air bleed of a float-type carburetor becomes clogged, the engine will run

rich at rated power.

One of the best ways to increase engine power and control detonation and pre-ignition is to

use water injection.

One purpose of an air bleed in a float-type carburetor is to

decrease fuel density and destroy surface tension.

An excessively lean fuel/air mixture may cause

an increase in cylinder head temperature.

When checking the idle mixture on a carburetor, the engine should be idling normally, then pull the mixture control toward the IDLE CUTOFF position. A correct idling mixture will be indicated by

an increase of 10 to 50 RPM before decreasing.

Detonation occurs when the fuel/air mixture

burns too fast.

What component is used to ensure fuel delivery during periods of rapid engine acceleration?

Acceleration pump

In order to stabilize cams, springs, and linkages within the fuel control, manufacturers generally recommend that all final turbine engine trim adjustments be made in the

increase direction

If the idling jet becomes clogged in a float-type carburetor, the

engine will not idle.

A carburetor is prevented from leaning out during quick acceleration by the

accelerating system

For what primary purpose is a turbine engine fuel control unit trimmed?

To obtain maximum thrust output when desired.

What is the relationship between the pressure existing within the throat of a venturi and the velocity of the air passing through the venturi?

The pressure is inversely proportional to the velocity.

acting on the fuel in the float chamber.

A major difference between the Teledyne-Continental and RSA (Precision Airmotive or Bendix) continuous flow fuel injection systems in fuel metering is that the

Continental system uses fuel pressure only as a metering force.

both No. 1 and No. 2 are true.

Generally, the practice when trimming an engine is to

turn all accessory bleed air off.

The device that controls the volume of the fuel/air mixture to the cylinders is called a

throttle valve

During engine operation, if carburetor heat is applied, it will

decrease the air density to the carburetor.

A nine-cylinder radial engine, using a multiple-point priming system with a central spider, will prime which cylinders?

One, two, three, eight, and nine.

What effect does high atmospheric humidity have on the operation of a jet engine?

Has little or no effect.

The throttle valve of float-type aircraft carburetors is located

between the venturi and the engine.

On a float-type carburetor, the purpose of the economizer valve is to

provide a richer mixture and cooling at maximum power output.

In turbine engines that utilize a pressurization and dump valve, the dump portion of the valve

drains the engine manifold lines to prevent fuel boiling and subsequent deposits in the lines as a result of residual engine heat (at engine shutdown).

If a float-type carburetor becomes flooded, the condition is most likely caused by

a leaking needle valve and seat assembly.

Which of the following is NOT an input parameter for a turbine engine fuel control unit?

Ambient humidity

An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a

False high compression and turbine discharge pressure, and a subsequent low trim.

When troubleshooting an engine for too rich a mixture to allow the engine to idle, what would be a possible cause?

Economizer valve not operating correctly.

An aircraft engine equipped with a pressure-type carburetor is started with the

primer while the mixture control is positioned at IDLE CUTOFF.

The back-suction mixture control system operates by

varying the pressure acting on the fuel in the float chamber.

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 unmetered fuel chamber to supplement the action of normal metering forces.

What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?

Fuel specific gravity setting.

The device that controls the ratio of the fuel/air mixture to the cylinders is called a

mixture control

Select the statement which is correct relating to a fuel level check of a float-type carburetor.

Do not measure the level at the edge of the float chamber.

If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the fuel/air mixture will become

richer as either the altitude or temperature increases.

An aircraft engine continuous cylinder fuel injection system normally discharges fuel during which stroke(s)?

All (continuously)

What carburetor component actually limits the desired maximum airflow to the engine at full throttle?

Venturi

The desired engine idle speed and mixture setting

is adjusted with engine warmed up and operating.

An indication that the optimum idle mixture has been obtained occurs when the mixture control is moved to IDLE CUTOFF and manifold pressure

decreases and RPM increases momentarily before the engine ceases to fire.

Which method is commonly used to adjust the level of a float in a float-type carburetor?

Add or remove shims under the needle-valve seat.

Under which of the following conditions will the trimming of a turbine engine be most accurate?

No wind and low moisture.

What factor is not used in the operation of an aircraft gas turbine engine fuel control unit?

Mixture control position.

Which statement is correct regarding a continuous-flow fuel injection system used on many reciprocating engines?

Fuel is injected at each cylinder intake port.

At what engine speed does the main metering jet actually function as a metering jet in a float-type carburetor?

All RPM’s above idle range.

When a new carburetor is installed on an engine,

the engine is warmed up to normal temperatures, adjust the idle mixture, then the idle speed.

What carburetor component measures the amount of air delivered to the engine?

Venturi