ATAC 303 week1
ATAC 303 Week 1 Pressurization Systems
Test your knowledge on aircraft pressurization systems with our comprehensive quiz designed for students and aviation enthusiasts alike. With 60 detailed questions, this quiz covers everything from pressurization control modes to the composition of airborne air quality.
Whether you're preparing for a certification exam or just want to brush up on your understanding of aviation systems, this quiz provides valuable insights into:
- Engine Performance
- Cabin Comfort
- Aircraft Systems
The outflow valve opens, closes or _________ to establish the correct pressure _______.
Modulates, position
Modulates, setting
Transfers, setting
Transfers, position
What is a preferred rate of climb or descent range?
100-200 ft/min
100-200 ft/sec
300-500 ft/min
300-500 ft/sec
What is the what is the approximate temperature rise of the air passing through the compressor section of the ACM?
10-20' C
20-30' C
30-40' C
40-50' C
While operating the aircraft pressurization in Isobaric mode, the controller switches to Constant Differential mode. Why did that happen?
Excessive pressure differential
Excessive use of Outflow valve
Excessive altitude
Excessive use in Isobaric
Which system on a small turbine engine aircraft utilizes a Venturi to mix ram air with bleed air for cabin pressurization?
Turbo-Comp
Jet engine
Jet pump
Turbo-Prop
Where is the outflow valve located on most aircraft?
Forward bulkhead
Aft bulkhead
Behind the pilot
Baggage compartment
What pressurization control mode maintains a single pressure input despite changes in altitude?
Isotope
Isobaric
Constant
Differential
The pressure _________ controls the position of the _______ valve to maintain the pressure level in the aircraft.
Outflow, regulator
Controller, regulator
Regulator, outflow
Regulator, control
What type of aircraft will most often use a vapor cycle system to cool the cabin?
Piston Engine
Large Transport
M2
Ramjets
Pressurization systems MUST provide comfort & safety to prevent rapid _____ pressurization changes, to _________ the air from inside to outside the vessel and provide air ____________.
Cabin, circulate, conditioning
Engine, circulate, conditioning
Engine, circulate, moisture
Cabin, circulate, moisture
Small turbine engine aircraft may use one of two methods to provide air for pressurization. They are...
Jet engine & Turbo-fan
Jet pump & Turbo-compressor
Jet engine & Turbo-compressor
Jet pump & Turbo-fan
What is the temperature of the air exiting the ACM for the final time?
Well above freezing
Near 0' C
Near 0' F
Well below freezing
What state is the Freon upon exiting the Compressor?
Low press. gas
High press. gas
High press. liquid
Low press. liquid
What component ensures the aircraft doesn't pressurize while on the ground before take-off?
WOW fuses, safety valve
Throttle switches, safety valve
Throttle fuses, safety valve
WOW switches, safety valve
An electro-pneumatic pressurization system uses __ motors to move the outflow valve with __ motors for ______
AC, DC, normal
DC, AC backup
DC, AC normal
AC, DC backup
Modern aircraft pressure control is fully automatic and all input parameters are processed through the ___ which directly _________ the outflow valve.
FMS, positions
ACM, selects
FMS, selects
ACM, positions
How is the water removed from the air?
Centrifugal Force
Low Pressure
High Pressure
Centripetal Force
Clean air provided for Crew and Pax comfort is regulated between __-__ and __-__ relative humidity.
65-85'F, 10-20%
60-90'C, 10-20%
65-85'C, 10-20%
60-90'F, 10-20%
Heat exchangers are of the _____ & ___ type and have a ______ -pass cross-flow configuration.
Plate & fin, triple
Plate & fin, double
Plate & fin, single
Plate & fin, quadruple
Where does the air travel when it leaves the Compressor?
Water Separator
Secondary Heat Exchanger
Main Heat Exchanger
Primary Heat Exchanger
Air quality during flight is maintained at close tolerances by using ____ filters and air "change" that occurs approximately ___ times per hour
OILY, 2.5
OILY, 12.5
HEPA 12.5
HEPA, 2.5
Aircraft pressurization can be controlled in what two modes?
Intermittent, Constant
Constant Differential, Continual
Isobaric, Continual
Constant Differential, Isobaric
What system uses bleed air from a small turbine engine to drive a turbine, then mixes compressed outside air with the bleed?
Turbo-compressor
Turbo-fan
Turbocharger
Supercharger
Regarding pressurization of an aircraft, the vessel must ensure crew & passengers have enough ______ at sufficient pressure for proper _____ saturation.
Nitrogen, carbon
Nitrogen, oxygen
Oxygen, blood
Carbon, blood
What are the components of the ACM?
Fan & Bleed Air
Compressor & Turbine
Fan & Turbine
Compressor & Bleed Air
As aircraft get older, more in-depth inspections are required to look for signs of _______ due to the ______________ cycle
Contact, differential
Fatigue, pressurization
Contact, pressurization
Fatigue, differential
What happens to the air when it cycles through the compressor?
Volume & Speed is increased
Temp & Pressure is raised
Volume and Temp is lowered
Temp & Pressure is reduced
What section of the turbine engine provides the PACK system with bleed air?
Hot
Turbine
Cold
Intake
What is used to remove heat from the bleed air?
Turbine air
Ram air
Iced air
Conditioned air
What are the three primary components of the vapor cycle system?
Condenser, Evaporator, Turbine
Evaporator, Condenser, Blower
Condenser, Compressor, Turbine
Evaporator, Compressor, Condenser
Hot air is supplied by the aircraft engines is known as what?
Hot Air
Bleed Air
Ventilation Air
Exhaust Air
The ___ is the most common method for pressurizing large _______ engine aircraft.
ASL, Turbine
ASL, Piston
ACM, Piston
ACM, Turbine
Air leaving the ACM for the final time has caused the moisture to condense. This must be removed to prevent _____ and this process is accomplished by using a _____ _________.
Icing, water purifier
Icing, heat sink
Icing, water separator
Icing, heat sock
Expanding air being released at the turbine outlet ______ the temperature to near ________.
Raises, freezing
Raises, condensing
Lowers, condensing
Lowers, freezing
On large transport category aircraft, what provides pressurization and air conditioning to the crew and passengers?
Freon Cycle
Vapour Cycle
PUCK
PACK
Air exiting the first stage of heat exchange is cooled and enters where?
Plenum
Compressor
Water Separator
Turbine
What powers the compressor section of the ACM?
Bleed air
Turbine
Compressor
Ram air
How many pressure controllers are mandated for use in transport type aircraft?
1 only
1 with manual
1 with alternate
2 with alternate
How can the aircraft remove air quickly in maintenance or emergency situations?
Safety Limiter
Dump Valve
Dump Door
Saftey Door
In "manual" mode the pilot can select the position of what component?
Outflow valve
Pressure regulator
Alternate controller
Inflow valve
In the event the aircraft pressure drops well below normal, what component will ensure outside air pressure doesn't exceed the cabin pressure?
Ambient filters
Altitude limiters
Altitude filters
Ambient limiters
Piston engine aircraft that fly below 25K feet may incorporate Superchargers, Turbochargers or EDCs to provide pressurized air to the cabin. What are the disadvantages of these components?
Oil or exhaust contamination
Decreased engine power
Extra weight
All the above
Water extracted from the air can be collected and fed to spray nozzles which direct this cold water into the ___ ___ duct to improve the __________ of the heat exchangers
Ram air, cooling
Ram air, efficiency
Bleed air, efficiency
Bleed air, cooling
When flying at altitude, large transport category aircraft must be strong enough to withstand ____________ pressures between outside and inside the vessel. This may be as high as how much psi?
Directional, 9
Directional, 15
Differential, 9
Differential, 15
What is the approximate temperature drop of the bleed air passing through the Primary Heat Exchanger?
50' C
75' C
100' C
150' C
Cabin pressure controllers on modern transport category aircraft use an ______-_________ means of changing the position of the _______ valve to achieve precise control.
Electro-pneumatic, regulator
Electro-pneumatic, outflow
Electro-mechanical, regulator
Electro-mechanical, outflow
Air has weight; what is the pressure at sea level?
10 psi
15 psi
29.92 psi
14.7 psi
What component is used to regulate the bleed air flow as the demands of the PACK change?
Flow Control Valve
Outflow Valve
Shut Off Valve
Dump Valve
What means are available to ensure the aircraft doesn't over-pressurize?
Check valves
Dump plugs
Relief valves
Intake plugs
What range would aircraft pressure be limited to?
8-10 psi
5-6 psi
1-3 psi
10 -15 psi
What does ACM stand for?
Air Centrifugal Machine
Atmosphere Cycle Machine
Air Circular Machine
Air Cycle Machine
The air pressure felt by the crew and passengers is known as what?
Cabin Altitude
Differential Pressure
Differential Altitude
Cabin Differential
Temperature drop of the air passing through the secondary heat exchanger is approximately how much?
10-20' C
60-70' C
70-80' C
80-100' C
What state is the Freon when it exits the Evaporator?
High press. liquid
Low press. liquid
Low press. gas
High press. gas
What type of material is used to construct the heat exchanger?
Aluminum
Glass
Composites
Steel
How does the turbine section get driven as it extracts heat from the air?
Steep blade pitch angle
Decreased blade pitch angle
Using the mixing valve
Compressor drives the turbine
What is the average pressure & temperature of the bleed air as it enters the primary heat exchanger?
30-40 psi, 50' C
100-120 psi, 50' C
30-40 psi, 150' C
100-120 psi, 150' C
Air enters the Turbine of the ACM where it _______ and ________ it's energy to ______ both wheels within the unit which are on a common shaft.
Expands, releases, stop
Expands, releases, rotate
Lessens, reduces, rotates
Reduces, expands, rotate
Hot air coming from the turbine engine is directed to which component?
ACM
Bleed Air
Secondary Heat Exchanger
Primary Heat Exchanger
How does the pilot know if the outflow valve is "open" or "closed" in manual mode?
Position Indicator
Position Valve
Selector Valve
Selector Indicator
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