Piston 2 Week 5C
When will a rate of change controller operate?
At mid range throttle settings
Only in descent
At full throttle
At all throttle settings
When will overshooting occur? #2
When rapid large decreases in throttle setting are made
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
If an engine uses an APC what else must it also have?
Something to prevent overboost
Something to prevent underboost
Something to prevent the engine from operating underspeed
Something to prevent the engine from operating overspeed
Why is a rate of change controller added to a turbocharger system?
To prevent rapid changes in boost resulting from abrupt throttle changes
To prevent rapid changes in boost resulting from abrupt propeller pitch changes
To prevent rapid changes in boost resulting from abrupt engine speed changes
To prevent rapid changes in boost resulting from abrupt attitude changes
When will overshooting occur? #1
When rapid small decreases in throttle setting are made
When rapid small increases in throttle setting are made
When rapid large increases in prop setting are made
When rapid large increases in throttle setting are made
What is a VAPC?
A variable mixture controller
A variable attitude pressure controller
A variable absolute pressure controller
A variable altitude pressure controller
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?
The speed will stay the same
Slow down
Turn around
Speed up
What will a VAPC do? #1
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
It will maintain a minimum boost pressure that will vary from idle to full power
What is overshooting?
A momentary underboost due to the turbocharging system's inability to stop increasing immediately
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 decreasing immediately
A momentary overboost due to the turbocharging system's inability to stop increasing immediately
In an aircraft with an APC controlled turbocharger, what will happen as the aircraft climbs?
The bellows will sense decreasing pressure, and position the valve more open
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 increasing pressure, and position the valve more open
How is an APC adjusted?
By turning a screw on the bellows
By turning a screw on the side of the valve
By turning a screw on the same end from the bellows
By turning a screw on the opposite end from the bellows
If the wastegate controller closes its valve, what will happen?
More 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
Less exhaust gas will bypass the turbine and it will slow down
What will a VAPC do? #2
It will maintain lower max boost pressure at idle and a higher max boost pressure at full power
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
What will an pressure ratio controller do?
Prevent upper deck pressure from exceeding 2.2 times that of the outside air 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 manifold pressure at all throttle settings
When will a VAPC be operating?
At all throttle settings
At full throttle
At idle throttle setting
At mid throttle settings
Which of the following best describes a rate of change controller?
Normally open, closing if boost decreases too fast
Normally open, closing if boost increases too fast
Normally closed, opening if boost increases too fast
Normally closed, opening if boost decreases too fast
How will a wastegate controller close the wastegate?
By "trapping" hydraulic pressure by closing its valve
By "dumping" hydraulic pressure by opening its valve
By "dumping" hydraulic pressure by closing its valve
By "trapping" hydraulic pressure by opening its valve
How will a wastegate controller open the wastegate?
By "trapping" hydraulic pressure by opening its valve
By "dumping" hydraulic pressure by closing its valve
By "trapping" hydraulic pressure by closing its valve
By "dumping" hydraulic pressure by opening its valve
What is added to the wastegate actuator to make sure it moves faster in one direction than the other?
A hydraulic damper is added to the output shaft
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
In an automatic turbocharger control system what will open the wastegate?
A pneumatically driven actuator
Springs
An oil pressure driven hydraulic actuator
An electric actuator
In an automatic turbocharger control system what will clsoen the wastegate?
An oil pressure driven hydraulic actuator
An electric actuator
Springs
An air driven pneumatic actuator
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 closing 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 opening the wastegate actuator
What is the power source for the wastegate actuator?
The engine driven starter/generator
The engine driven vacuum/air pump
The engine driven alternator/generator
The engine driven oil pump
Where is a wastegate controller located?
Downstream of the actuator
In parallel with the actuator
Upstream of the actuator
In series before the actuator
What will an APC do?
Control the minimum upper deck pressure at full throttle
Control the maximum manifold pressure at full throttle
Control the maximum upper deck pressure at all throttle settings
Control the maximum upper deck pressure at full throttle
In an aircraft with an APC controlled turbocharger, what will happen as the aircraft descends?
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
The bellows will sense increasing pressure, and position the valve more closed
When will overshooting occur? #3
When rapid small increases in throttle setting are made
When rapid small decreases in throttle setting are made
When rapid large increases in prop setting are made
When the engine is operated with too low oil temperatures
In an automatic turbocharger control system what will control the turbine speed?
An oil pressure operated hydraulic actuator driving the wastegate closed
An electrically operated actuator driving the wastegate closed
An oil pressure operated hydraulic actuator driving the wastegate open
An electrically operated actuator driving the wastegate open
What will the sloped controller do to upper deck pressure as the throttle is advanced?
The pressure will decrease
The pressure will increase
The pressure across the throttle valve will be held constant
The pressure will stay constant
What is one of the advantages of using a differential pressure controller?
It prevents bootstrapping
It prevents rough idling
It prevents underboosting
It prevents overboosting
What does the density controller do?
It controls manifold pressure
It controls the pressure difference between the manifold and upper deck
It controls maximum boost at all throttle settings
It controls full throttle maximum boost
What is the purpose of a sea level boosted engine?
To maintain sea level performance above the critical altitude
To maintain sea level performance below sea level
To maintain sea level performance up to the aircraft's service ceiling
To maintain sea level performance up to the critical altitude
What does the differential pressure controller do?
It controls the pressure difference between the manifold and upper deck
It controls full throttle maximum boost
It controls manifold pressure
It controls maximum boost at all throttle settings
When does the density controller control the turbocharger?
It does not, that is the job of the differential pressure controller
At idle
At full throttle
At all throttle settings
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 oil 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 oil 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 oil 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 oil pressure to bypass exhaust gasses around the turbocharger
How will the density controller control the speed of the turbocharger?
When the air density in the upper deck is too high it will close its valve and dump oil 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 oil 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 dump oil 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 oil pressure to bypass exhaust gasses around the turbocharger
What will happen to the performance of a sea level boosted engine once it is above it's critical altitude?
Nothing
Performance (hp) will rise
Performance (min engine RPM) will drop
Performance (hp) will drop
What is the purpose of a sloped turbo controller system?
To limit maximum boost at part throttle settings
To limit maximum boost at idle
To limit maximum boost at full throttle
To limit maximum boost at all throttle settings
What was the purpose of turbo-compounding?
To reduce the crankshaft power requirement to supercharge the engine
To recover some of the energy lost in the intake gas stream
To increase the volumetric efficiency of the engine
To recover some of the energy lost in the exhaust gas stream
How much of the exhaust energy could a turbo-compounding system recover?
10%
20%
30%
40%
What kind of joints are used in a collector type exhaust system?
Slip type, expansion type, flex or ball type joints
Slip type and expansion type joints
Slip type
Slip type and flex type joints
What kind of exhaust system will an opposed type engine use?
A collector type system
A short stack system
An open port system
A collector ring type system
What kind of engine would use a short stack exhaust? #2
An v-type engine
A radial engine
A horizontally opposed engine
An inverted radial engine
What kind of exhaust system will an radial type engine use?
An open port system
A collector ring type system
A short stack system
A collector type system
What kind of engine would use a short stack exhaust? #1
A horizontally opposed engine
An inverted radial engine
A radial engine
An early inline engine
What was the disadvantage of a short stack exhaust?
In a side-slip cold air could crack the exhaust valve
Poor scavenging during the valve overlap period
In a side-slip cold air could crack the intake valve
Excessive back pressure in a side slip
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