Piston 2 - Week 3C
What is the biggest advantage of a pressure carburetor?
It is less complicated and more reliable than a fuel injection system
It does not suffer from any icing issues
It is not affected by abrupt manoeuvers or inverted flight
It has better acceleration characteristics than a regular carburetor
What is the purpose of the throttle body on a pressure carburetor?
To control and measure the flow of air
To control and measure the flow of fuel
To control and measure the flow of air and fuel
To control and measure the flow of air, to add the correct amount of fuel to it
Which of the following is a subsystem of a pressure carburetor?
Metering system
Mixture control system
Idle system
Power enrichment system
Airflow power enrichment valve
Manual power enrichment valve
All of the above
What forces does a pressure carburetor use?
Gravity metering force
Air and fuel metering forces
Air metering forces
Fuel metering forces
What does the air metering force in a pressure carburetor do?
It uses regulated fuel pressure force acting on a diaphragm to adjust a control valve
It uses impact/inlet and venturi pressures acting on a diaphragm to move a control valve
It uses venturi pressure and fuel pressure acting on a diaphragm to move a control valve
It uses impact/inlet pressure and fuel pressure acting on a diaphragm to move a control valve
What is force used to deliver fuel to the discharge nozzle of a pressure carburetor?
Partial vacuum
Differential air pressure
Gravity
Fuel pump pressure
What does the fuel metering force in a pressure carburetor do?
It uses impact/inlet and venturi pressures acting on a diaphragm to move a control valve
It uses impact/inlet pressure and fuel pressure acting on a diaphragm to move a control valve
It uses regulated fuel pressure force acting on a diaphragm to adjust a control valve
It uses venturi pressure and fuel pressure acting on a diaphragm to move a control valve
What are the major components of a pressure caburetor?
The supercharger, automatic mixture control, regulator unit & fuel control units
The automatic mixture control, regulator unit & fuel control units
The throttle body, automatic mixture control, regulator unit & fuel control units
The throttle body, automatic mixture control, & regulator unit units
Why is the fuel discharge nozzle of a pressure carburetor after the throttle valve?
Reduced icing issues and increased vaporization efficiency
Reduced icing issues and decreased vaporization efficiency
Increased icing issues and decreased vaporization efficiency
Increased icing issues and increased vaporization efficiency
Where is the discharge nozzle of a pressure carburetor?
Before the venturi
After the throttle valve
After the venturi, before the throttle valve
In the venturi
What is used to control fuel flow to the discharge nozzle of a pressure carburetor?
The throttle and a combination of outlet and venturi air pressures
Fuel pressure and a combination of outlet and venturi air pressures
Fuel pressure and a combination of inlet and venturi air pressures
The float and a combination of inlet and venturi air pressures
What is contained in the throttle body of a pressure carburetor?
The throttle valves, mixture control & metering system
The throttle valves, metering system & power enrichment system
The throttle valves & mixture control system
The throttle valves, main and boost venturis and impact tubes
What controls the power enrichment valve in a pressure carburetor?
Venturi air pressure and a mechanical connection to the throttle valve
Impact air pressure and a mechanical connection to the throttle valve
Impact air pressure and a mechanical connection to the idle valve
Venturi air pressure and a mechanical connection to the idle valve
What does the manual mixture control in a pressure carburetor work like?
Like the variable orifice system in a regular carburetor
Like the back suction system in a regular carburetor
Like the air bleed system the the discharge nozzle in a regular carburetor
Like the butterfly valve in a regular carburetor
What is the purpose of the idle valve in a pressure carburetor?
To maintain minimum fuel flow at idle, based on throttle position and impact pressure
To maintain minimum fuel flow at idle, based on venturi pressure
To maintain minimum fuel flow at idle, based on throttle position and venturi pressure
To maintain minimum fuel flow at idle, based on throttle position
What kind of valve will control the fuel flow in pressure carburetor?
Differential air force will open the poppet valve
Fuel force will open the needle valve
Fuel force and differential air force will open the butterfly valve
Fuel force and differential air force will open the poppet valve
What moves the accelerating pump in a pressure carburetor?
A linkage from the throttle valve and diaphragm/spring action
The pressure after the throttle valve and diaphragm/spring action
The pressure before the throttle valve and diaphragm/spring action
The venturi pressure and diaphragm/spring action
What kind of valve will control the fuel flow in pressure carburetor?
A rotary valve
A poppet valve
A sleeve valve
A needle valve
What pressures are fed to the discharge nozzle of a pressure carburetor?
Unmetered fuel pressure, venturi pressure and impact air pressure
Metered fuel pressure, manifold pressure and impact air pressure
Metered fuel pressure and venturi pressure
Metered fuel pressure, venturi pressure and impact air pressure
How many different signatures are required for an independent inspection?
Four
Two
Three
One
Where is the independent inspection entered in the logs?
Before the maintenance release
After the maintenance release
In the record of modifications only
Before the description of the work performed
What must be done after disturbing the engine control linkages?
A dual or independent inspection
A single or individual inspection
A triple or triplicate inspection
Nothing special
What is required to be done as part of an independent inspection?
Fit must be checked, the sense of motion must be correct, the range of motion must be correct
All locking devices must be secured correctly, the sense of motion must be correct, the range of motion must be correct
Fit must be checked, all locking devices must be secured correctly, the sense of motion must be correct, the range of motion must be correct
All locking devices must be secured correctly, the sense of motion must be correct, the range of motion must be correct, airworthiness of the complete aircraft must be checked
What is the general procedure for removing a carburetor?
Ignition off, fuel off, hydraulics system off, lockwire the throttle closed, disconnect all fluid lines
Fuel off, disconnect throttle and mixture linkages, disconnect all fluid lines
Disconnect throttle and mixture linkages, lockwire the throttle closed, disconnect all fluid lines
Fuel off, disconnect throttle and mixture linkages, lockwire the throttle closed, disconnect all fluid lines
What should you always do before removing a carburetor?
Turn the ignition system off
Pull the throttle to idle
Pull the mixture to idle cut off
Shut the fuel off
When checking the idle mixture you find an RPM rise of 50-60 rpm. What is the issue with the mixture?
Mixture is too rich
Mixture is too lean
No issue, it is correct
Mixture is slightly rich
Mixture is slightly lean
How is the idle speed adjusted on a carburetor?
By turning the adjustment screw on the idle mixture scontrol, adjusted with the engine cold
By turning the adjustment screw on the idle mixture scontrol, adjusted with the engine hot
By turning the adjustment screw on the throttle arm, adjusted with the engine cold
By turning the adjustment screw on the throttle arm, adjusted with the engine hot
Why will engine RPM drop when pulling carburetor heat on?
Because heated air is less dense, leading to the mixture becoming more lean
Because heated air is more dense, leading to the mixture becoming more lean
Because heated air is more dense, leading to the mixture becoming more rich
Because heated air is less dense, leading to the mixture becoming more rich
What carburetor adjustment is shown by the finger?
Full throttle mixture
Idle speed
Throttle max speed
Idle mixture
How is the idle mixture checked?
At 1500 RPM, pull the mixture back and record the rpm rise
At full throttle, pull the mixture back and record the rpm rise
At idle, pull the mixture back and record the rpm rise
At 2000 RPM, pull the mixture back and record the rpm rise
How is the idle speed on a carburetor adjusted upwards?
Turn the idle screw counter-clockwise when cold
Turn the idle screw counter-clockwise when hot
Turn the idle screw clockwise when hot
Turn the idle screw clockwise when cold
How is a carburetor's float level adjusted?
By bending the needle valve tab on the float assembly
By adjusting the needle valve length
By turning the idle adjustment screw
By bending the needle valve tab on the float bowl assembly
What carburetor adjustment is shown by the green arrow?
Idle speed
Idle mixture
Full throttle mixture
Throttle max speed
When checking the idle mixture you find an RPM rise of 0-5 rpm. What is the issue with the mixture?
Mixture is too rich
Mixture is slightly rich
Mixture is slightly lean
No issue, it is correct
Mixture is too lean
How much of an RPM drop should there be when checking carburetor heat?
0-50 RPM
500-800 RPM
The engine should stop
150-200 RPM
When is a carburetor's float level adjusted?
Monthly
At overhaul
Annually
Every 100hrs
How do you richen out the idle mixture on a carburetor?
Push the idle mixture screw in
Turn the idle mixture screw all about
Turn the idle mixture screw in
Turn the idle mixture screw out
Why should the carburetor heat system by checked twice?
To make sure control movement is smooth in both directions
To make sure that it will always work
To ensure it works at both idle and higher engine speeds
It is part of the independent inspection requirements
How do you lean out the idle mixture on a carburetor?
Turn the idle mixture screw out
Push the idle mixture screw in
Turn the idle mixture screw all about
Turn the idle mixture screw in
When checking the idle mixture you find an RPM rise of 15-20 rpm. What is the issue with the mixture?
Mixture is too lean
Mixture is too rich
Mixture is slightly rich
Mixture is slightly lean
No issue, it is correct
When checking the idle mixture you find an RPM rise of 75-100 rpm. What is the issue with the mixture?
Mixture is slightly lean
Mixture is too rich
Mixture is too lean
No issue, it is correct
Mixture is slightly rich
When checking the idle mixture you find an RPM rise of 25-50rpm. What is the issue with the mixture?
No issue, it is correct
Mixture is too lean
Mixture is slightly lean
Mixture is slightly rich
Mixture is too rich
What is this carburetor part? #1
A plastic float
Salad tongs
A composite float
A brass float
What is this carburetor part? #3
A brass float
A composite float
Salad tongs
A plastic float
What is this carburetor part? #2
A plastic float
Salad tongs
A composite float
A brass float
What is pointed to by Arrow A?
Maximum speed adjustment
Fuel shut off
Mixture control
Idle speed adjustment
Idle mixture adjustment
Throttle control
What is pointed to by Arrow B?
Maximum speed adjustment
Throttle control
Idle mixture adjustment
Idle speed adjustment
Mixture control
Fuel shut off
What is pointed to by Arrow C?
Throttle control
Fuel shut off
Maximum speed adjustment
Mixture control
Idle speed adjustment
Idle mixture adjustment
What is pointed to by Arrow D?
Maximum speed adjustment
Fuel shut off
Throttle control
Idle speed adjustment
Mixture control
Idle mixture adjustment
What is this part? #5
Discharge nozzle
Boost venturi
Float
Main venturi
Idle mixture screw
Inlet screen
Float bowl
Pump discharge tube
Pump discharge check valve
Needle valve
Mixture control
Throttle valve
Accelerator pump
Drain plug
What is this part? #10
Boost venturi
Pump discharge check valve
Pump discharge tube
Throttle valve
Main venturi
Needle valve
Accelerator pump
Mixture control
Idle mixture screw
Inlet screen
Discharge nozzle
Float bowl
Float
Drain plug
What is this part? #4
Drain plug
Pump discharge check valve
Throttle valve
Pump discharge tube
Boost venturi
Float bowl
Float
Main venturi
Accelerator pump
Idle mixture screw
Needle valve
Discharge nozzle
Mixture control
Inlet screen
What is this part? #3
Accelerator pump
Pump discharge check valve
Boost venturi
Pump discharge tube
Idle mixture screw
Float bowl
Float
Drain plug
Main venturi
Discharge nozzle
Throttle valve
Mixture control
Inlet screen
Needle valve
What is this part? #6
Float
Idle mixture screw
Accelerator pump
Inlet screen
Main venturi
Float bowl
Boost venturi
Pump discharge check valve
Drain plug
Needle valve
Throttle valve
Mixture control
Discharge nozzle
Pump discharge tube
What is the part pointed to by A? #14
Accelerator pump
Pump discharge check valve
Boost venturi
Throttle valve
Float bowl
Inlet screen
Discharge nozzle
Main venturi
Needle valve
Mixture control
Pump discharge tube
Float
Drain plug
Idle mixture screw
What is the part pointed to by B? #13
Throttle valve
Pump discharge check valve
Needle valve
Drain plug
Float bowl
Mixture control
Accelerator pump
Float
Discharge nozzle
Pump discharge tube
Main venturi
Idle mixture screw
Inlet screen
Boost venturi
What is this part? #9
Accelerator pump
Float
Discharge nozzle
Float bowl
Mixture control
Drain plug
Inlet screen
Throttle valve
Pump discharge tube
Boost venturi
Main venturi
Needle valve
Idle mixture screw
Pump discharge check valve
What is this part? #1
Main venturi
Discharge nozzle
Idle mixture screw
Drain plug
Mixture control
Boost venturi
Accelerator nozzle
Throttle valve
Accelerator pump
Needle valve
Inlet screen
Float bowl
Accelerator check valve
Float
What is this part? #11
Drain plug
Idle mixture screw
Float bowl
Accelerator pump
Needle valve
Pump discharge check valve
Main venturi
Boost venturi
Throttle valve
Mixture control
Float
Discharge nozzle
Inlet screen
Pump discharge tube
What is this part? #8
Float
Discharge nozzle
Main venturi
Throttle valve
Mixture control
Pump discharge check valve
Float bowl
Idle mixture screw
Accelerator pump
Boost venturi
Inlet screen
Needle valve
Pump discharge tube
Drain plug
What is this part? #12
Discharge nozzle
Mixture control
Needle valve
Throttle valve
Main venturi
Drain plug
Accelerator pump
Inlet screen
Idle mixture screw
Pump discharge tube
Float
Pump discharge check valve
Boost venturi
Float bowl
What is this part? #2
Pump discharge tube
Accelerator pump
Discharge nozzle
Mixture control
Float
Accelerator check valve
Drain plug
Needle valve
Idle mixture screw
Float bowl
Boost venturi
Main venturi
Throttle valve
Inlet screen
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