Final apmosheric controls
Final Atmospheric Controls Quiz
Test your knowledge of atmospheric control systems in aviation with our comprehensive quiz! This quiz covers key concepts related to air cycle cooling systems, combustion heaters, and vapor cycle cooling systems.
Whether you are a student, a professional in the field, or just an aviation enthusiast, this quiz will enhance your understanding and retention of crucial air conditioning and heating concepts in aircraft.
- 46 targeted questions
- Multiple-choice format
- Instant feedback on answers
At which component in an aircycle cooling system does air under go a pressure and temperature drop.
Expansion side
The primary heat exchanger
Refridgeration bypass valve
Turbine engine air used for AC and pressurization is generally called what
Compressed air
Ram air
Bleed air
The basic air cycle cooling system consists of what
A source of compressed air, heat exchangers and turbine
Heaters coolers and compressors
Where does the last stage of cooling in an aircycle AC system occur
Refridgeration unit compressor
Secondary heat exchanger
Expansion turbine
What is ventilating air used for on a combustion heater
Provide combustion air for ground blower
Carries heat to cabin
Provides air to support the plane
Where does the combustion heater generally receive fuel from
Main fuel tanks
Its own tank
It does not fuel driven by engine
What does considering good practice conserning the inspection of heating and exhaust systems of aircraft utalizing a jacket around the engine exhaust as a heat source.
Frequent inspections with periodic operational carbon monoxide detection test
All exhaust systems components should be removed periodically and the condition determined by magnetic particle inspection method
All exhaust systems should be entirely replaced at each 100 hour inspection
Why are electric heating systems uncomman in the aviation industry
They require significant output from aircraft generators
They catch fire
Too difficult to service
The operation of an aircraft combustion heater is usually controlled by a thermister thermistat circuit
Alternitavely turning the fuel on and off, process is known as cycling
By metering the amount of fuel continuosly entering the heater and there for regulates the heater by output
By regulating voltage applied to the heaters and gives them transformer
How many heat exchangers are generally in an aircycle machine system
1
2
3
Which of the following is not a characterstic of an pack valve
Regulates bleed air from pnuematic manifold to aircycle system
Closes the shuttle air conditioning system when it overheats
Extracts heat energy from bleed air
Which air cycle air conditioning component is responsible for pulling excess moisture out of the air
Heat exchanger
Water seperator
Bleed air bypass
In an electric heating system which of the following is utilized to produce heat
Bleed air
Heat exchanger
Heating elements
What is a major concern with exhaust shroud heaters
Carbon monoxide
Internal combustion
Which heating system is completely independant from aircraft enginges
Combustion heaters
Exhaust shroud
Bleed air systems
Where are the air cycle and air conditioning systems usually installed
Lower half of fuselage or tail
Nose compartment
Baggage compartment
Which component in the air cycle AC system regulates warm bypass air to be mixed with the cold air produced by the air cycle system to produce a comfortable temperature for the passengers
Bleed air bypass
Heat exchanger
Pack
Distribution of cabin air on presurized aircraft is managed how
Single air duct that runs from ACM to cabin
Single airduct that runs from presurization source to cabin
System of airducts leading from pressurization source in and throughout cabin
The valve in the distribution system for mixing the air going into cabin is controlled by what
Bleed air source selector
Cockpit or cabin by temp selector
What is the function of the air distribution vs circulation system
Recuirculates air from bleed air source into mixing manifold to heat up the air condition air coming out of the acm to a temperature required for the cabin
Recirculates air from cabin back into the fixed manifold to reduce required air output from airconditoning system lessening the impact on engines bleed air
In a freon vapor cycle cooling system the condensor transfers its heat to which of the following
Turbine engine compressor
Ambient outside air
Pressurized cabin
What component might possibly be dmamaged if liquid refriderant is introduced to the low side of the vapor cycle cooling system when the pressure is too high or the outside temperature is too low
The compressor
The condensor
The evaporator
How can it be determined the vapor cycle cooling system is charged with the proper amount of freon
No bubbles in sight glass
Compressor loads up and rpm decreases
Air bubbles in sight glass
Heat always flows from what
Hot to cold
Cold to hot
What is relationship between pressure and boiling point.
Pressure increases boiling point increases
Pressure increases boiling point decreases
Frost or ice buildup on a vapor cycle cooling system evaporator would most likely be caused by what
Mixing valve sticking closed
Moisture in evaporator.
Inadequit airflow to the evaporator
The point a which freon flowing through a vapor cycle cooling system gives heat and changes from a gas to a liquid is the what
Condensor
Evaporator
Expansion valve
The point a which freon flowing through a vapor cycle cooling system absorbs heat and changes from a liquid to a gas is the what
Condesor
Evaporator
Expansion valve
The function of an evaporator in a freon cooling system is what
Liquify freon in the line between the comporessor and condesnor
Transfer heat from cabin air tor refriderant to cool it down
Transfer heat from the freon gas to ambiant air
The position of the thermal expansion valve in a vapor cycle system is determined by temperature and pressure of what
Freon entering evaporator
Air in outlet of condenser
Freon in outlet of evaporator
The function of the condenser in a freon cooling system is to do what
Transfer heat from gassius refridgerant to ambient outside air
Change liquid freon into gas before it enters the compressor
Transfer heat from cabin air to the liquid freon
The state of refridgerant inside the compressor is what
Gas
Liquid
What are the two sides of a vapor cycle air conditioning system
Low and high
Top and bottom
What does a steady stream of bubbles indicate when servicing a vapor cycle air condtitoning system
System overcharged
System properly charged
System undercharged
What unit in a vapor cycle cooling system serves as a reservior and filter for refridgerant
Receiver dryer
Evaporater
Condesnor
What is the condition of the refridgerant as it enters the condesor
High pressure liquid
High pressure vapor
What is the condition of the refridgerant as it enters the evaporator of a vapor cycle cooling system
High pressure liquid
Low pressure liquid
High pressure vapor
Water in the vapor cycle system is problematic because of the potential formation of ice
Reaction of refridgerant that makes acid
It has potential to mold
What is the condition of refridgerant as it leaves the evaporator of a vapor cycle cooling system
Low pressure liquid
High pressure vapor
Low pressure vapor
The centerhose of a manifold set is connected and used how when servicing vapor cycle system
Attaches to service valve located at the high side of the system
Attaches to service valve located in the lower side of the system
Attaches to vaccuum pump to evacute system or to supply refriderant
When pruging a freon air conditioning system is is important to release the charge at a slow rate, WHY?
To prevent large amount of freon from contaminating the surrounding atmosphere
Prevent excessive loss of refrigerant oil
Prevent condensation
What component in a vapor cycle cooling system would most likely be at fault if a system will not take a freon charge
Thermal expansion valve
Condensor
Receiver dryer
A small amount of water in a vapor cycle cooliung system can freeze
Receiver dryer
Expansion valve
What unit is located downstream of the exansion valve in a freon refridgeration system
Condensor
Compressor
Evaporator coils
After cleaning or replacing the filter element in a combustion heater fuel system the system should be pressurized
And all connections checked for leaks
The fuel filter bypass valvle resets to the filter position
A sample of fuel taken downstream from the filter to insure proper operation of the filter element
In an operating vapor cycle cooling system if the two lines connected to the expansion valve are essentially the same temperature what does this indicate
The system functioning normally
The expansion valvle is not metering freon properly
The compressor is pumping too much refriderant
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