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