Maintenance Procedure Week 3
What will happen to the performance of a sea level boosted engine once it is above it's critical altitude?
The engine will overspeed and overheat
Nothing
Performance (horsepower) will drop
Performance (horsepower) will rise
When does the density controller control the turbocharger?
At full throttle
It does not, that is the job of the differential pressure controller
At idle
At all throttle settings
What does the density controller do?
It controls full throttle maximum boost
It controls maximum boost at all throttle settings
It controls manifold pressure
It controls the pressure difference between the manifold and upper deck
What does the differential pressure controller do?
It controls maximum boost at all throttle settings
It controls manifold pressure
It controls full throttle maximum boost
It controls the pressure difference between the manifold and upper deck
How will the density controller control the speed of the turbocharger?
When the air density in the upper deck is too low it will open its valve and dump pressure to bypass exhaust gasses around the turbocharger
When the air density in the upper deck is too high it will close its valve and dump pressure to bypass exhaust gasses around the turbocharger
When the air density in the upper deck is too low it will open its valve and build pressure to bypass exhaust gasses around the turbocharger
When the air density in the upper deck is too high it will open its valve and dump pressure to bypass exhaust gasses around the turbocharger
How will the differential pressure controller control the speed of the turbocharger?
When the air difference between the upper deck and the manifold pressure is too low it will close its valve and dump pressure to bypass exhaust gasses around the turbocharger
When the air difference between the upper deck and the manifold pressure is too high it will open its valve and dump pressure to bypass exhaust gasses around the turbocharger
When the air difference between the upper deck and the manifold pressure is too high it will close its valve and dump pressure to bypass exhaust gasses around the turbocharger
When the air difference between the upper deck and the manifold pressure is too low it will open its valve and dump pressure to bypass exhaust gasses around the turbocharger
What is one of the advantages of using a differential pressure controller?
It prevents bootstrapping
It prevents underboosting
It prevents overboosting
It prevents rough idling
Which of the following components prevents the boost from fluctuating up and down?
Density Controller
Sloped Controller
Wastegate
Differential Pressure Controller
What will a VAPC do?
It will allow the pilot to control and set the cabin altitude
It will maintain higher max boost pressure at idle and a lower max boost pressure at full power
It will maintain lower min boost pressure at idle and a higher min boost pressure at full power
It will maintain lower max boost pressure at idle and a higher max boost pressure at full power
How is turbine speed controlled in an automatic turbocharger system (typically found on a Continental Engine)?
An electrically operated actuator operating the relief valve
An oil and spring-operated wastegate that ports exhaust gases to or away from the turbine
An electrically operated actuator driving VAPC
An oil and spring-operated wastegate that ports exhaust gases to or away from the compressor
In an automatic turbocharger control system what will open the wastegate?
Springs
An oil pressure driven hydraulic actuator
An electric actuator
A pneumatically driven actuator
In an automatic turbocharger control system what will close the wastegate?
Springs
An air driven pneumatic actuator
An electric actuator
An oil pressure driven actuator
What is the power source for the wastegate actuator?
The engine driven starter/generator
The engine driven alternator/generator
The engine driven vacuum/air pump
The engine driven oil pump
What is added to the wastegate actuator to make sure it moves faster in one direction than the other?
A restrictor is added to the inlet side
An automatic braking system is added to the output shaft
A restrictor is added to the outlet side
A hydraulic damper is added to the output shaft
How will a wastegate controller open the wastegate?
By "trapping" hydraulic pressure by opening its valve
By "dumping" hydraulic pressure by opening its valve
By "dumping" hydraulic pressure by closing its valve
By "trapping" hydraulic pressure by closing its valve
What is the source of "muscle" pressure that drives the wastegate actuator towards the closed position?
Turbocharger compressor discharge pressure
Hydraulic pressure
Fuel pressure from the EDP
Oil pressure from the EDP
Where is a wastegate controller located?
Downstream of the actuator
In parallel with the actuator
In series before the actuator
Upstream of the actuator
If the wastegate controller opens its valve, what will happen?
More exhaust gas will bypass the turbine and it will slow down
Less exhaust gas will bypass the turbine and it will speed up
Less exhaust gas will bypass the turbine and it will slow down
More exhaust gas will bypass the turbine and it will speed up
If the wastegate controller closes its valve, what will the turbocharger do?
Turn around
Speed up
The speed will stay the same
Slow
If the wastegate controller closes its valve, what will happen?
Less exhaust gas will bypass the turbine and it will slow down
More exhaust gas will bypass the turbine and it will speed up
Less exhaust gas will bypass the turbine and it will speed up
More exhaust gas will bypass the turbine and it will slow down
What will an APC do?
Control the maximum manifold pressure at full throttle
Control the maximum upper deck pressure at full throttle
Control the minimum upper deck pressure at full throttle
Control the maximum upper deck pressure at all throttle settings
If an engine uses an APC what else must it also have?
Something to prevent the engine from operating overspeed
Something to prevent underboost
Something to prevent the engine from operating underspeed
Something to prevent overboost
How is an APC adjusted?
By turning a screw on the side of the valve
By turning a screw on the bellows
By turning a screw on the opposite end from the bellows
By turning a screw on the same end from the bellows
In an aircraft with an APC controlled turbocharger, what will happen as the aircraft climbs?
The bellows will sense increasing pressure, and position the valve more closed
The bellows will sense decreasing pressure, and position the valve more closed
The bellows will sense decreasing pressure, and position the valve more open
The bellows will sense increasing pressure, and position the valve more open
In an aircraft with an APC controlled turbocharger, what will happen as the aircraft descends?
The bellows will sense increasing pressure, and position the valve more closed
The bellows will sense decreasing pressure, and position the valve more open
The bellows will sense increasing pressure, and position the valve more open
The bellows will sense decreasing pressure, and position the valve more closed
What will a pressure ratio controller do?
Prevent upper deck pressure from exceeding 2.2 times that of the manifold pressure at all throttle settings
Prevent upper deck pressure from exceeding 2.2 times that of the outside air pressure at full throttle
Prevent upper deck pressure from exceeding 2.2 times that of the manifold pressure at full throttle
Prevent upper deck pressure from exceeding 2.2 times that of the outside air pressure at all throttle settings
When upper deck pressure exceeeds 2.2 times ambient air pressure what will an pressure ratio controller do?
It will open its valve, dumping oil pressure and opening the wastegate actuator
It will close its valve, dumping oil pressure and closing the wastegate actuator
It will close its valve, dumping oil pressure and opening the wastegate actuator
It will open its valve, dumping oil pressure and closing the wastegate actuator
Why is a rate of change controller added to a turbocharger system?
To prevent rapid changes in boost resulting from abrupt engine speed changes
To prevent rapid changes in boost resulting from abrupt propeller pitch changes
To prevent rapid changes in boost resulting from abrupt throttle changes
To prevent rapid changes in boost resulting from abrupt attitude changes
Which of the following best describes a rate of change controller?
Normally closed, opening if boost decreases too fast
Normally open, closing if boost decreases too fast
Normally closed, opening if boost increases too fast
Normally open, closing if boost increases too fast
When will a rate of change controller operate?
At full throttle
At mid range throttle settings
At all throttle settings
Only in descent
When will a VAPC be operating?
At mid throttle settings
At idle throttle setting
At full throttle
At all throttle settings
What will a VAPC do?
It will maintain a minimum boost pressure that will vary from idle to full power
It will maintain a maximum manifold pressure that will vary from idle to full power
It will maintain a maximum boost pressure that will vary from idle to full power
It will maintain a minimum manifold boost pressure that will vary from idle to full power
What is a VAPC?
A variable altitude pressure controller
A variable mixture controller
A variable absolute pressure controller
A variable attitude pressure controller
Which of the following is NOT a use for a Turbocharger on an aircraft piston engine?
To create a pressure source to drive instruments and the de-ice systems
To increase sea level horsepower
To maintain sea level horsepower to a critical altitude
To provide air for cabin pressurization
In a turbocharged induction system what is used in case of air filter blockage?
A sonic venturi
A sonic venturi
Alternate air
Carburetor heat
What is an intercooler for?
To cool the engine oil
To cool the turbocharger outlet gasses
To cool induction air after it has been compressed
To cool induction air before it has been compressed
What is an aftercooler for?
To cool induction air after it has been compressed
To cool the engine oil
To cool the turbocharger outlet gasses
To cool induction air before it has been compressed
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 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
To limit the amount of air coming off the manifold, going to the cabin for pressurization
Why would a turbocharger be used?
To decrease sea level horsepower
To normalize, to maintain sea level horsepower
To create a pressure source to drive instruments and the de-ice systems
To decrease horsepower at altitude
Why would a turbocharger be used?
To create a vacuum source to drive instruments and the de-ice systems
To decrease sea level horsepower
To provide air to pressurize the cabin
To create a pressure source to drive instruments and the de-ice systems
What will happen to a turbocharged engine's power as it climbs?
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
It will stay constant for the aircraft's whole altitude range
What will happen to a turbocharged engine's power as it decends?
It will stay constant until the critical altitude, after which it will drop
It will slowly drop
It will stay constant for the aircraft's whole altitude range
It will increase until the critical altitude, after which it will level out
What is used to turn the compressor of a turbocharger?
The compressor will be turned by the crankshaft
Exhaust gasses passing through a turbine will turn the compressor
Intake gasses passing through a turbine will turn the compressor
The compressor will be turned by the propeller gearbox
In a turbocharger how is the turbine connected to the compressor?
It is driven by a fluid coupling
It is gear driven
It is directly driven by a shaft
It is a free wheel turbine
How is the speed of the compressor controlled in a turbocharger system?
By controlling the flow of exhaust gases out of the compressor
By controlling the flow of exhaust gases into the turbine
By controlling the flow of filtered air into the compressor
By controlling the flow of exhaust gases out of the turbine
Which of the following is a basic component of a turbocharger?
APC
Centrifugal compressor
Axial compressor
VAPC
Which of the following is a basic component of a turbocharger?
Slope controller
APC
Axial turbine
Centrifugal turbine
Which of the following is a basic component of a turbocharger?
Axial turbine
Density controller
Housing
APC
Which of the following is a basic component of a turbocharger?
The core
APC
Axial turbine
Density controller
Which of the following is a basic component of a turbocharger?
APC
Axial turbine
Density controller
The shaft
Where will the exhaust gasses enter a turbocharger?
Through the center of the turbine
Through the circular plenum around the outside of the compressor
Through the center of the compressor
Through the circular plenum around the outside of the turbine
Where will the intake gasses enter a turbocharger?
Through the center of the compressor
Through the circular plenum around the outside of the compressor
Through the center of the turbine
Through the circular plenum around the outside of the turbine
Where will the intake gasses leave a turbocharger?
Through the center of the turbine
Through the center of the compressor
Through the circular plenum around the outside of the turbine
Through the circular plenum around the outside of the compressor
Where will the exhaust gasses leave a turbocharger?
Through the center of the turbine
Through the center of the compressor
Through the circular plenum around the outside of the turbine
Through the circular plenum around the outside of the compressor
What will be the intake gas path through the turbocharger?
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
In through the circular plenum and out through the center of the turbine wheel
In through the center of the turbine wheel and out through the circular plenum
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 kind of air will go into the compressor of a turbocharger?
Filtered air from around the engine
Unfiltered air from an external inlet
Unfiltered air from around the engine
Filtered air from an external inlet
What is the compressor discharge pressure of a turbocharger also called?
Exhaust back pressure
Upper deck pressure
Manifold pressure
Exhaust gas pressure
What is the compressor discharge tube of a turbocharger also called?
Upper deck
Throttle body
Intake manifold
Exhaust manifold
What could happen if all the exhaust gasses passed through the turbocharger?
Too low upper deck pressure
Too low manifold pressure
Excessive exhaust back pressure
Excessive manifold pressure
What could happen if all the exhaust gasses passed through the turbocharger?
Overboosting
Too low manifold pressure
UInderboosting
Too low upper deck pressure
What is used to control the amount of exhaust gasses that will go through the turbocharger?
A pressure relief valve
A restriction in the exhaust pipe
A wastegate
Variable valve timing of the engine's exhaust valves
What are the three basic manual turbocharger control systems?
Linked wastegate control, manual waste gate control, and ground adjustable restrictor
Linked wastegate control, manual waste gate control, and ground APC
Manual wastegate control, and ground adjustable restrictor
Linked wastegate control, manual waste gate control, and VAPC
What is often used to protect the engine from excessive turbocharger "boost"?
A bypass valve which will redirect some of the turbochargers exhaust air back into the inlet
A bypass valve which will redirect some of the turbochargers output air back into the inlet
A pressure relief valve, set 1.5 - 2" of Hg above max specified boot.
A back-pressure sensing thermal compensating negative relief bypass valve
What is used to control the amount of exhaust gasses that will go through the turbocharger?
A pressure relief valve
Variable valve timing of the engine's exhaust valves
An exhaust bypass valve
A restriction in the exhaust pipe
What is overshooting?
A momentary underboost due to the turbocharging system's inability to stop decreasing immediately
A momentary overboost due to the turbocharging system's inability to stop increasing immediately
A momentary overboost due to the turbocharging system's inability to stop decreasing immediately
A momentary underboost due to the turbocharging system's inability to stop increasing immediately
When will overshooting occur?
When rapid small increases in throttle setting are made
When rapid small decreases in throttle setting are made
When rapid large increases in throttle setting are made
When rapid large increases in prop setting are made
When can an overshooting occur?
When the engine is operated with low oil temperatures
When rapid small increases in throttle setting are made
When rapid large increases in prop setting are made
When rapid small decreases in throttle setting are made
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