Piston 2 - Week 3B
When the throttle valve is fully closed what will the engine be doing?
Providing a fully lean mixture
Generating maximum power
Providing a fully rich mixture
Generating minimum power
What is the most common type of carburetor used in aircraft?
Side draft
Pressure injection
Updraft
Downdraft
What is the butterfly valve in a carburetor also known as?
The mixture control valve
The carburetor heat valve
The fuel selector valve
The throttle valve
Which of the following are types of carburetor?
Updraft
Downdraft
Side draft
All of the above
Which of the following a a purpose of a carburetor? #2
To clean the air before it goes into the engine
To control exhaust flow out of the engine
To mix fuel and air in the correct mixture
To carry the fuel to the cylinders
Which control in the cockpit moves the butterfly valve?
The carburetor heat control
The mixture control
The prop control
The throttle control
When the throttle valve is fully open what will the engine be doing?
Generating maximum power
Providing a fully rich mixture
Providing a fully lean mixture
Generating minimum power
What will happen in the venturi of a carburetor?
The air will slow down, pressure and temperature will drop
The air will slow down, pressure and temperature will rise
The air will speed up, pressure and temperature will rise
The air will speed up, pressure and temperature will drop
What is often done to increase the pressure drop in the carburetor's venturi?
A small ejector pump nozzle will be added
The cross section of the venturi will change from round to oval
The size of the venturi will be increased
A second "boost" venturi will be added
What is used to determine the amount of air and fuel deliver to the engine?
Metered fuel pressure
Fuel pressure
Differential pressure
Absolute pressure
Where is the butterfly valve located in the carburetor?
Before the venturi
In the induction manifold
In the fuel bowl
After the venturi
What does the butterfly valve control in a carburetor?
Mixture ratio
Fuel flow
Engine speed and power
Air flow
Where will the lowest pressure in a carburetor be found?
Just after the throttle plate
At the greatest restriction (smallest part) of the venturi
In the fuel bowl
At the smallest restriction (biggest part) of the venturi
How is the differential pressure in a carburetor created?
Using a axial fan
Using a constant displacement pump
Using a venturi
Using gravity
Which of the following a a purpose of a carburetor? #1
To control air flow into the engine
To carry the air to the cylinders
To clean the air before it goes into the engine
To control exhaust flow out of the engine
Which of the following a a purpose of a carburetor? #3
To control exhaust flow out of the engine
To clean the air before it goes into the engine
To atomize fuel
To carry the air to the cylinders
Which of the following does a float type carburetor have in it? #2
A seat and needle valve
A spider valve
A fuel pump
A fuel injector
A metering unit
How often will the inlet screen be cleaned in a carburetor?
Daily
Every 100hrs
Weekly
Monthly
Which of the following does a float type carburetor have in it? #4
A float assembly
A metering unit
A fuel injector
A spider valve
A fuel pump
In a carburetor, what does the inlet screen do?
It filters the air going into the carb
It filters the fuel going out of the carb
It filters the fuel going into the carb
It filters the air going out of the carb
What is the purpose of the float bowl vent?
To allow atmospheric or intake pressure into the bowl for positive fuel flow through the discharge nozzle
To allow atmospheric or intake pressure into the bowl for negative fuel flow through the discharge nozzle
To allow fuel into the bowl for positive fuel flow through the discharge nozzle
To allow fuel into the bowl for negative fuel flow through the discharge nozzle
How will the carburetor inlet screen typically be cleaned?
Be blowing it clean with shop air
By removal and solvent washing
By opening of the sump drain valve
By removal and water washing
What does the float bowl do in a carburetor?
It controls fuel flow out of the carburetor
It stores fuel and houses metering and discharge components
It controls air flow through the carburetor
It stores air and houses metering and discharge components
Which of the following does a float type carburetor have in it? #1
A fuel injector
An inlet screen
A spider valve
A fuel pump
What does the seat and needle valve do in a carburetor?
It controls the flow of fuel out of the float bowl
It controls the flow of fuel into the float bowl
It controls the flow of air out of the venturi
It controls the flow of air into the venturi
How does the float assembly work?
Buoyancy and leverage on the butterfly valve to set fuel level in the bowl
Sinking and leverage on the needle valve to set fuel level in the bowl
Buoyancy and leverage on the needle valve to set fuel level in the bowl
Buoyancy and sleeve valve to set fuel level in the bowl
What does the main metering system comprise of in a carburetor?
Fuel pump, fuel injector, spider valve, fuel injection nozzles
Fuel pump, main jet, discharge nozzle, idling system & throttle valve
Venturi tubes, fuel injector, spider valve, fuel injection nozzles
Venturi tubes, main jet, discharge nozzle, idling system & throttle valve
Which of the following does a float type carburetor have in it? #5
A spider valve
A fuel injector
A float bowl vent
A fuel pump
A metering unit
What makes the needle valve open and close against the seat?
The mixture lever
The throttle lever
Air pressure
The float assembly
When would the seat and needle valve be adjusted?
As required
At overhaul
Annually
Every 100hrs
When will the main metering system be active in a carburetor?
Only when operating at idle
At engine speeds above idle
Only when operating full rich
At engine speeds below idle
How often will the fuel bowl be drained?
Weekly
Daily
500hrs
100hrs
Which of the following does a float type carburetor have in it? #3
A metering unit
A fuel injector
A fuel pump
A spider valve
A float bowl
What does the float assembly do in a carburetor?
It stores fuel and houses metering and discharge components
It controls air flow through the carburetor
It controls fuel flow into the float bowl
It controls fuel flow out of the float bowl
Why does a simple carburetor work poorly at idle?
At idle the air flow is so slow that there is no pressure differential to draw the fuel out of the nozzle
At idle the air flow is so fast that there is no pressure differential to draw the fuel out of the nozzle
At idle the air flow is so fast that there is too much pressure differential which draws too much fuel out of the nozzle
At idle the air flow is so slow that there is too much pressure differential which draws too much fuel out of the nozzle
What does the mixture control do in a carburetor?
It opens and closes a valve between the venturi and the butterfly valve
It opens and closes a valve between the main metering jet and the discharge nozzle
It opens and closes a valve between the fuel strainer and the fuel bowl
It opens and closes a valve between the fuel bowl and the main metering jet
What is the most common type of mixture control valve in a carburetor?
The needle valve type
The butterfly type
A rotary sleeve valve
The fixed orifice type
How do you make the mixture go to full lean with a carburetor?
Push the mixture lever forward
Push the throttle forward
Pull the mixture lever aft
Push the throttle aft
How does a back pressure mixture control adjust fuel flow in a carburetor?
By changing the position of a rotary type sleeve valve to the discharge nozzle
By use of a butterfly valve to the manifold pressure
By raising and lowering the position of the float valve
By changing the exposure of the bowl vent air to the venturi air pressure
Where is the idle port located in a carburetor?
Just downstream or above the throttle valve
Just upstream or below the throttle valve
Just downstream or below the throttle valve
Just upstream or above the throttle valve
What controls the flow of fuel into the air in a carburator?
The differential between fuel and venturi air pressures
The differential between venturi and float bowl pressures
The differential between venturi and fuel pressures
The differential between manifold and float bowl pressures
Which type of mixture control in a carburetor uses air pressure to control mixture?
The forward pressure mixture control
The butterfly valve
The back pressure mixture control
The step cut rotary valve
What kind of valve is used to control the idle mixture?
Needle valve
Slide valve
Rotary valve
Butterfly valve
Where is idle fuel drawn from in a carburetor?
Directly from the fuel bowl
Directly from the fuel strainer
From downstream of the main metering jet
From upstream of the main metering jet
What does a modern carburetor add to eliminate the idling problem of simple carburetors?
A pump to force the fuel out
Extra air bleeds to reduce surface tension at the main fuel nozzle
Fuel nozzles upstream of the throttle valve
Fuel nozzles downstream of the throttle valve
How do you make the mixture go to full rich with a carburetor?
Push the mixture lever forward
Push the throttle aft
Pull the mixture lever aft
Push the throttle forward
What causes a nozzle to spray droplets instead of a fine mist?
Friction
Surface tension
Surface torsion
Turbulence in the fluid flow
What is the fuel flowing through the fuel nozzle called in a carburetor?
Discharged fuel
Metered fuel
Unmetered fuel
Undischarged fuel
What is done to promote a finer spray out of the discharge nozzle in a carburetor?
Air is introduced into the fuel flow going to the nozzle
Nitrogen is introduced into the fuel flow going to the nozzle
Manifold pressure is introduced into the fuel flow going to the nozzle
Vacuum is introduced into the fuel flow going to the nozzle
How does a back pressure mixture control stop fuel flow in a carburetor?
By connecting venturi air to the float chamber
By connecting venturi air to the float
By connecting vent air to the float chamber
By connecting manifold pressure to the float chamber
What is the most common type of mixture control valve in a carburetor?
The butterfly type
The variable orifice type
The needle valve type
The fixed orifice type
What determines the amount of fuel drawn through the fuel nozzle in a carburetor?
The amount of fuel flowing through the venturi
The amount of fuel flowing past the throttle valve
The amount of air flowing through the venturi
The position of the prop control
What happens to the air/fuel mixture during a rapid opening of the throttle when using a carburetor?
The mixture will richen causing the engine to hesitate or stagger
The mixture will richen causing the engine to provide a surge of power
The mixture will lean out causing the engine to provide a surge of power
The mixture will lean out causing the engine to hesitate or stagger
What are the two types of acceleration systems used in a carburetor?
Acceleration well & accelerator pump
Air bleed & accelerator pump
Variable orifice and step cut rotary valve
Acceleration well & air bleed
When will the accelerator pump of a carburetor push out fuel?
As the mixture goes to full lean
As the throttle goes to full power
As the throttle goes to idle
As the mixture goes to full rich
How is hesitation prevented in a carburetor when advancing the throttle quickly?
By addition of an air bleed system to provide a brief boost in air flow
By addition of an air bleed system to provide a brief drop in air flow
By addition of an accelerator system to provide a brief boost in fuel flow
By addition of an accelerator system to provide a brief drop in fuel flow
How does an acceleration well provide extra fuel in a carburetor?
It has a mechanical fuel pump which will inject extra fuel through the discharge nozzle as needed
It has a storage area for fuel between the main jet and the discharge nozzle that can be drawn upon as needed
It has a mechanical fuel pump which will inject extra fuel through a dedicated fuel nozzle as needed
It has a storage area for fuel which will inject extra fuel through a dedicated fuel nozzle as needed
When will the accelerator pump of a carburetor draw in fuel?
As the throttle goes to idle
As the mixture goes to full lean
As the mixture goes to full rich
As the throttle goes to full power
How does a bleed type economizer work in a carburetor?
As the throttle moves to full open the needle valve will open to provide additional fuel to the discharge nozzle
As the throttle moves to full open the needle valve will close to reduce the fuel flow to the discharge nozzle
As the throttle moves to full open the bleed needle valve will close to reduce the air flow to the discharge nozzle
As the throttle moves to full open the bleed needle valve will open to increase the air flow to the discharge nozzle
Why does the air/fuel mixture lean when opening the throttle quickly when using a carburetor?
Because fuel has lower density than fuel and will accelerate quicker
Because air has lower density than fuel and will accelerate quicker
Because fuel has lower density than fuel and will accelerate slower
Because air has higher density than fuel and will accelerate slower
What is the purpose of the economizer system in a carburetor?
To enrich the mixture at high power setting to improve fuel efficiency
To lean the mixture at high power setting to improve fuel efficiency
To enrich the mixture to reduce engine temperatures at high power settings
To enrich the mixture to reduce engine temperatures at low power settings
How does a bleed type economizer work in a carburetor? #2
It operates in parallel with the air bleed to increase air flow to the discharge nozzle
It operates in series with the main metering jet to decrease fuel flow
It operates in series with the air bleed to decrease air flow to the discharge nozzle
It operates in parallel with the main metering jet to increase fuel flow
How does a needle type economizer work in a carburetor?
As the throttle moves to full open the needle valve will open to provide additional fuel to the discharge nozzle
As the throttle moves to full open the bleed needle valve will open to increase the air flow to the discharge nozzle
As the throttle moves to full open the needle valve will close to reduce the fuel flow to the discharge nozzle
As the throttle moves to full open the bleed needle valve will close to reduce the air flow to the discharge nozzle
What are the two types of economizer systems?
Needle type and bleed type
Needle type and butterfly type
Rotary type and butterfly type
Rotary type and needle type
Where will the accelerator pump of a carburetor spray out extra fuel?
Through the fuel nozzles just downstream of the throttle valve
Through the discharge nozzle
Through a dedicated fuel nozzle
Through the fuel nozzles just upstream of the throttle valve
How does a needle type economizer work in a carburetor? #2
It operates in series with the air bleed to decrease air flow to the discharge nozzle
It operates in parallel with the air bleed to increase air flow to the discharge nozzle
It operates in series with the main metering jet to decrease fuel flow
It operates in parallel with the main metering jet to increase fuel flow
What provides the force to spray the extra fuel in the accelerator pump of a carburetor?
Air pressure dropping in the venturi
An engine driven fuel pump
A mechanical fuel pump driven by the throttle lever
A electrically driven fuel pump
What provides the force to spray the extra fuel in an acceleration well of a carburetor?
Air pressure dropping in the venturi
A mechanical fuel pump driven by the throttle lever
A electrically driven fuel pump
A n engine driven fuel pump
Which of the following is a limitation of a carburetor?
High operating pressures results in incomplete fuel vaporization
Low operating pressures results in incomplete fuel vaporization
High operating pressures results in excessive fuel vaporization
Low operating pressures results in excessive fuel vaporization
Which of the following is a limitation of a carburetor? #3
Pressure drops and vaporization can result in large temperature increases in the venturi
Pressure drops and vaporization can result in large temperature drops in the venturi
Temperature drops and vaporization can result in large pressure increases in the venturi
Low operating pressures results in excessive fuel vaporization
Which of the following is a limitation of a carburetor? #5
Moisture in the intake air can freeze and cause icing
Float design does not react well to harsh manoeuvres or inverted flight
Relatively low operating pressures can result in incomplete vaporization of fuel
All of the above
Which of the following is a limitation of a carburetor? #2
Low operating pressures results in excessive fuel vaporization
High operating pressures results in incomplete fuel vaporization
Float design does not react well to harsh manoeuvers or inverted flight
Float design does not react well to upright flight
Which of the following is a limitation of a carburetor? #4
Moisture in the intake air can freeze and cause icing
Temperature drops and vaporization can result in large pressure increases in the venturi
Pressure drops and vaporization can result in large temperature increases in the venturi
Low operating pressures results in excessive fuel vaporization
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