Piston 2 - Week 5B
What is the purpose of a sonic venturi?
To limit the amount of air coming off upper deck, going to the cabin for pressurization
To limit the amount of air coming off the manifold, going to the cabin for pressurization
To limit the amount of air coming off the turbine, going to the cabin for pressurization
To limit the amount of air coming off upper deck, going to the engine for increased volumetric efficiency
What is an intercooler for?
To cool the turbocharger outlet gasses
To cool the engine oil
To cool induction air before it has been compressed
To cool induction air after it has been compressed
In a turbocharged induction system what is used in case of air filter blockage?
Alternate air
Carburetor heat
Intercoolers
A sonic venturi
What is an aftercooler for?
To cool induction air before it has been compressed
To cool the engine oil
To cool the turbocharger outlet gasses
To cool induction air after it has been compressed
What will control the speed of a supercharger?
Nothing or the pilot with manual control, depending on the version
The variable absolute pressure controller and pressure relief valve
The absolute pressure controller
The slope controller
What will happen to a supercharged engine's power as it climbs?
It will slowly drop
It will stay constant until the critical altitude, after which it will drop
It will stay constant for the aircraft's whole altitude range
It will stay constant until the critical altitude, after which it will climb
What is used to drive the compressor of a supercharger?
Power from the crankshaft
Power from a ram air turbine
Power from the propeller reduction unit
Power from an exhaust driven turbine
What will happen to a supercharged engine's power as it decends?
It will stay constant until the critical altitude, after which it will climb
It will stay constant until the critical altitude, after which it will drop
It will slowly rise
It will stay constant for the aircraft's whole altitude range
What is used to turn the compressor of a turbocharger?
Exhaust gasses passing through a turbine will turn the compressor
The compressor will be turned by the crankshaft
Intake gasses passing through a turbine will turn the compressor
The compressor will be turned by the propeller gearbox
What will happen to a turbocharged engine's power as it decends?
It will stay constant for the aircraft's whole altitude range
It will stay constant until the critical altitude, after which it will drop
It will slowly drop
It will increase until the critical altitude, after which it will level out
How is the speed of the compressor controlled in a turbocharger system?
By controlling the flow of air out of the compressor
By controlling the flow of air into the compressor
By controlling the flow of air into the turbine
By controlling the flow of air our of the turbine
Why would a turbocharger be used? #1
To create a pressure source to drive instruments and the de-ice systems
To decrease sea level horsepower
To increase sea level horsepower
To create a vacuum source to drive instruments and the de-ice systems
Why would a turbocharger be used? #2
To normalize, to maintain sea level horsepower
To decrease sea level horsepower
To decrease horsepower at altitude
To create a pressure source to drive instruments and the de-ice systems
In a turbocharger how is the turbine connected to the compressor?
It is directly driven by a shaft
It is driven by a fluid coupling
It is chain driven
It is gear driven
What will happen to a turbocharged engine's power as it climbs?
It will increase until the critical altitude, after which it will level out
It will slowly drop
It will stay constant until the critical altitude, after which it will drop
It will stay constant for the aircraft's whole altitude range
Why would a turbocharger be used? #3
To create a vacuum source to drive instruments and the de-ice systems
To provide air to pressurize the cabin
To decrease sea level horsepower
To create a pressure source to drive instruments and the de-ice systems
Which of the following is a basic component of a turbocharger? #1
APC
VAPC
Centrifugal compressor
Axial compressor
Which of the following is a basic component of a turbocharger? #2
Slope controller
Axial turbine
Centrifugal turbine
APC
Which of the following is a basic component of a turbocharger? #4
Density controller
APC
The core
Axial turbine
Which of the following is a basic component of a turbocharger? #3
Housing
APC
Axial turbine
Density controller
Which of the following is a basic component of a turbocharger? #5
Axial turbine
The shaft
Density controller
APC
What is the compressor discharge tube of a turbocharger also called?
Intake manifold
Throttle body
Upper deck
Exhaust manifold
Where will the exhaust gasses enter a turbocharger?
Through the circular plenum around the outside of the turbine
Through the center of the turbine
Through the center of the compressor
Through the circular plenum around the outside of the compressor
Where will the intake gasses enter a turbocharger?
Through the circular plenum around the outside of the turbine
Through the center of the compressor
Through the circular plenum around the outside of the compressor
Through the center of the turbine
What is the compressor discharge pressure of a turbocharger also called?
Exhaust gas pressure
Exhaust back pressure
Upper deck pressure
Manifold pressure
What will be the exhaust gas path through the turbocharger?
In through the center of the turbine wheel and out through the circular plenum
In through the circular plenum and out through the center of the turbine wheel
In through the center of the compressor wheel and out through the divergent passage
In through the divergent passage and out through the center of the compressor wheel
What will be the intake gas path through the turbocharger?
In through the center of the turbine wheel and out through the circular plenum
In through the divergent passage and out through the center of the compressor wheel
In through the circular plenum and out through the center of the turbine wheel
In through the center of the compressor wheel and out through the divergent passage
Where will the intake gasses leave a turbocharger?
Through the center of the compressor
Through the circular plenum around the outside of the compressor
Through the circular plenum around the outside of the turbine
Through the center of the turbine
What kind of air will go into the compressor of a turbocharger?
Filtered air from an external inlet
Filtered air from around the engine
Unfiltered air from an external inlet
Unfiltered air from around the engine
Where will the exhaust gasses leave a turbocharger?
Through the center of the turbine
Through the circular plenum around the outside of the turbine
Through the circular plenum around the outside of the compressor
Through the center of the compressor
What could happen if all the exhaust gasses passed through the turbocharger? #2
Overboosting
UInderboosting
Too low manifold pressure
Too low upper deck pressure
What is often used to protect the engine from excessive turbocharger "boost"?
A pressure relief valve, set 1.5 - 2mm of Hg above max specified boot.
A pressure relief valve, set 1.5 - 2" of Hg above max specified boot.
A bypass valve which will redirect some of the turbochargers output air back into the inlet
A bypass valve which will redirect some of the turbochargers exhaust air back into the inlet
What is used to control the amount of exhaust gasses that will go through the turbocharger? #1
A pressure relief valve
A wastegate
A restriction in the exhaust pipe
Variable valve timing of the engine's exhaust valves
What is used to control the amount of exhaust gasses that will go through the turbocharger? #2
Variable valve timing of the engine's exhaust valves
An exhaust bypass valve
A restriction in the exhaust pipe
A pressure relief valve
What are the three basic manual turbocharger control systems?
Linked waste gate control, manual waste gate control, and VAPC
Linked waste gate control, manual waste gate control, and ground APC
Manual waste gate control, and ground adjustable restrictor
Linked waste gate control, manual waste gate control, and ground adjustable restrictor
What could happen if all the exhaust gasses passed through the turbocharger? #1
Too low manifold pressure
Excessive manifold pressure
Too low upper deck pressure
Excessive exhaust back pressure
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