ATAC303 - Ice Rain - Week 1
ATAC303 - Ice Rain Quiz
Test your knowledge on aircraft pressurization systems with this comprehensive quiz designed for Aviation students and professionals. With 30 engaging multiple-choice questions, you'll explore essential concepts like ACM, PACK systems, and heat exchangers.
Prepare to challenge yourself and enhance your understanding of aviation pressurization by:
- Learning key terms and components
- Understanding the fun
ctions of pressurization systems - Gaining insight into aircraft mechanics
What does ACM stand for?
Air Circular Machine
Atmosphere Cycle Machine
Air Cycle Machine
Air Centrifugal Machine
The ___ is the most common method for pressurizing large _______ engine aircraft.
ACM, Turbine
ASL, Turbine
ASL, Piston
ACM, Piston
What component is used to regulate the bleed air flow as the demands of the PACK change?
Outflow Valve
Dump Valve
Flow Control Valve
Shut Off Valve
Where does the air travel when it leaves the Compressor?
Water Separator
Primary Heat Exchanger
Secondary Heat Exchanger
Main Heat Exchanger
On large transport category aircraft, what provides pressurization and air conditioning to the crew and passengers?
PUCK
Freon Cycle
PACK
Vapour Cycle
While operating the aircraft pressurization in Isobaric mode, the controller switches to Constant Differential mode. Why did that happen?
Excessive use in Isobaric
Excessive pressure differential
Excessive use of Outflow valve
Excessive altitude
Expanding air being released at the turbine outlet ______ the temperature to near ________.
Lowers, condensing
Raises, freezing
Lowers, freezing
Raises, condensing
Air has weight; what is the pressure at sea level?
29.92 psi
14.7 psi
10 psi
15 psi
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, moisture
Engine, circulate, conditioning
Cabin, circulate, moisture
What type of material is used to construct the heat exchanger?
Composites
Steel
Aluminum
Glass
Clean air provided for Crew and Pax comfort is regulated between __-__ and __-__ relative humidity.
60-90'C, 10-20%
65-85'C, 10-20%
60-90'F, 10-20%
65-85'F, 10-20%
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
Hot air coming from the turbine engine is directed to which component?
Primary Heat Exchanger
ACM
Secondary Heat Exchanger
Bleed Air
What section of the turbine engine provides the PACK system with bleed air?
Hot
Intake
Cold
Turbine
What powers the compressor section of the ACM?
Turbine
Ram air
Compressor
Bleed air
Where is the outflow valve located on most aircraft?
Aft bulkhead
Baggage compartment
Behind the pilot
Forward bulkhead
Aircraft pressurization can be controlled in what two modes?
Isobaric, Continual
Intermittent, Constant
Constant Differential, Continual
Constant Differential, Isobaric
What is the approximate temperature drop of the bleed air passing through the Primary Heat Exchanger?
50' C
75' C
100' C
150' C
In "manual" mode the pilot can select the position of what component?
Alternate controller
Pressure regulator
Outflow valve
Inflow valve
What state is the Freon when it exits the Evaporator?
Low press. gas
High press. gas
High press. liquid
Low press. liquid
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
The pressure _________ controls the position of the _______ valve to maintain the pressure level in the aircraft.
Outflow, regulator
Controller, regulator
Regulator, control
Regulator, outflow
What range would aircraft pressure be limited to?
8-10 psi
1-3 psi
10 -15 psi
5-6 psi
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
As aircraft get older, more in-depth inspections are required to look for signs of _______ due to the ______________ cycle
Fatigue, differential
Fatigue, pressurization
Contact, pressurization
Contact, differential
What component ensures the aircraft doesn't pressurize while on the ground before take-off?
Throttle fuses, safety valve
WOW switches, safety valve
Throttle switches, safety valve
WOW fuses, safety valve
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?
Differential, 15
Directional, 15
Differential, 9
Directional, 9
How many pressure controllers are mandated for use in transport type aircraft?
2 with alternate
1 with alternate
1 only
1 with manual
How can the aircraft remove air quickly in maintenance or emergency situations?
Dump Door
Safety Limiter
Dump Valve
Safety Door
Air exiting the first stage of heat exchange is cooled and enters where?
Water Separator
Turbine
Plenum
Compressor
What system uses bleed air from a small turbine engine to drive a turbine, then mixes compressed outside air with the bleed?
Turbocharger
Turbo-compressor
Supercharger
Turbo-fan
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
Reduces, expands, rotate
Lessens, reduces, rotates
What pressurization control mode maintains a single pressure input despite changes in altitude?
Isotope
Isobaric
Constant
Differential
How does the turbine section get driven as it extracts heat from the air?
Decreased blade pitch angle
Using the mixing valve
Compressor drives the turbine
Steep blade pitch angle
What type of aircraft will most often use a vapor cycle system to cool the cabin?
Ramjets
M2
Piston Engine
Large Transport
What is a preferred rate of climb or descent range?
300-500 ft/sec
100-200 ft/sec
100-200 ft/min
300-500 ft/min
What state is the Freon upon exiting the Compressor?
Low press. gas
High press. gas
Low press. liquid
High press. liquid
An electro-pneumatic pressurization system uses __ motors to move the outflow valve with __ motors for ______
DC, AC backup
DC, AC normal
AC, DC, normal
AC, DC backup
Heat exchangers are of the _____ & ___ type and have a ______ -pass cross-flow configuration.
Plate & fin, double
Plate & fin, quadruple
Plate & fin, triple
Plate & fin, single
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
How does the pilot know if the outflow valve is "open" or "closed" in manual mode?
Selector Indicator
Position Valve
Selector Valve
Position Indicator
Modern aircraft pressure control is fully automatic and all input parameters are processed through the ___ which directly _________ the outflow valve.
FMS, positions
ACM, positions
ACM, selects
FMS, selects
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
Bleed air, cooling
Ram air, efficiency
Bleed air, efficiency
What happens to the air when it cycles through the compressor?
Volume and Temp is lowered
Volume & Speed is increased
Temp & Pressure is raised
Temp & Pressure is reduced
Hot air is supplied by the aircraft engines is known as what?
Exhaust Air
Bleed Air
Hot Air
Ventilation Air
Which system on a small turbine engine aircraft utilizes a Venturi to mix ram air with bleed air for cabin pressurization?
Jet pump
Turbo-Prop
Jet engine
Turbo-Comp
Regarding pressurization of an aircraft, the vessel must ensure crew & passengers have enough ______ at sufficient pressure for proper _____ saturation.
Oxygen, blood
Nitrogen, carbon
Nitrogen, oxygen
Carbon, blood
What means are available to ensure the aircraft doesn't over-pressurize?
Relief valves
Intake plugs
Dump plugs
Check valves
What is the temperature of the air exiting the ACM for the final time?
Well below freezing
Near 0' C
Well above freezing
Near 0' F
Small turbine engine aircraft may use one of two methods to provide air for pressurization. They are...
Jet engine & Turbo-fan
Jet engine & Turbo-compressor
Jet pump & Turbo-fan
Jet pump & Turbo-compressor
The outflow valve opens, closes or _________ to establish the correct pressure _______.
Modulates, setting
Transfers, setting
Modulates, position
Transfers, position
The air pressure felt by the crew and passengers is known as what?
Differential Pressure
Differential Altitude
Cabin Altitude
Cabin Differential
What is the average pressure & temperature of the bleed air as it enters the primary heat exchanger?
30-40 psi, 50' C
30-40 psi, 150' C
100-120 psi, 50' C
100-120 psi, 150' C
Air quality during flight is maintained at close tolerances by using ____ filters and air "change" that occurs approximately ___ times per hour
OILY, 12.5
OILY, 2.5
HEPA 12.5
HEPA, 2.5
Cabin pressure controllers on modern transport category aircraft use an ______-_________ means of changing the position of the _______ valve to achieve precise control.
Electro-mechanical, outflow
Electro-pneumatic, regulator
Electro-mechanical, regulator
Electro-pneumatic, outflow
What are the three primary components of the vapor cycle system?
Evaporator, Condenser, Blower
Evaporator, Compressor, Condenser
Condenser, Compressor, Turbine
Condenser, Evaporator, Turbine
What is used to remove heat from the bleed air?
Conditioned air
Iced air
Turbine air
Ram air
What are the components of the ACM?
Compressor & Bleed Air
Fan & Turbine
Fan & Bleed Air
Compressor & Turbine
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
Ambient limiters
Altitude filters
Altitude limiters
How is the water removed from the air?
Low Pressure
High Pressure
Centripetal Force
Centrifugal Force
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