10 Cabin Atmosphere Word Scramble

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Question	Answer
An aircraft oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified	with the test date, DOT number, and serial number stamped on the cylinder near the neck.
What test is used to determine the serviceability of an oxygen cylinder?	Pressure test with water.
The operation of an aircraft combustion heater is usually controlled by a thermostat circuit which	alternately turns the fuel on and off, a process known as cycling.
How is the cabin pressure of a pressurized aircraft usually controlled?	By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set.
What is ventilating air used for on a combustion heater?	Carries heat to the places where needed.
A contaminated oxygen system is normally purged with	oxygen
To be eligible for recharging, a DOT 3HT oxygen cylinder must have been hydrostatically tested every three years and be retired from service after	24 years or 4,380 filling cycles.
The evacuation of a vapor-cycle cooling system removes any water that may be present by	lowering the boiling point of the water and drawing out the vapor.
What type of oil is suitable for use in vapor-cycle cooling system?	Special high grade refrigeration oil.
Where does the last stage of cooling in an air-cycle air conditioning system occur?	Expansion turbine.
An aircraft pressurization cycle is normally considered to be	one complete series of events or operations that recur regularly.
The cabin pressure control setting has a direct influence upon the	outflow valve opening.
One purpose of a jet pump in a pressurization and air conditioning system is to	provide for augmentation of airflow in some areas of the aircraft.
Before a high-pressure oxygen cylinder is serviced, it must be the correct type and have been	hydrostatically tested within the proper time interval.
In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream?	Pressure relief valve.
Which of the following are characteristics of a chemical or solid-state oxygen system?	A volume storage capacity about three times that of compressed oxygen and system generators that are inert below 400°F, even under severe impact.
Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source?	Delivery air duct check valve.
What controls the operation of the cabin pressure regulator?	Cabin altitude.
In the diluter demand oxygen regulator, when does the demand valve operate?	When the user breathes.
In a freon vapor-cycle cooling system, where is cooling air obtained for the condenser?	Ambient air.
If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the	Department of Transportation.
A pressurization controller uses	barometric pressure, cabin altitude, and cabin rate of change.
The point at which freon flowing through a vapor-cycle cooling system absorbs heat and changes from a liquid to a gas is the	evaporator.
When servicing an air conditioning system that has lost all of its freon, it is necessary to	check oil and add as necessary, evacuate the system, and add freon.
The air-cycle cooling system produces cold air by	extracting heat energy across an expansion turbine.
After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and	all connections checked for leaks.
The component that determines the pressure level in the cabin is the cabin air pressure	outflow valve.
(Refer to Figure 13.) Determine what unit is located immediately downstream of the expansion valve in a freon refrigeration system.	Evaporator coils.
When Refrigerant-12 is passed over an open flame, it	changes to phosgene gas.
The function of the condenser in a freon cooling system is to	transfer heat from the freon gas to ambient air.
What is the purpose of pressurizing the aircraft cabin?	To make human flight possible in the hostile environment of the upper atmosphere.
The purpose of a subcooler in a vapor-cycle cooling system is to	cool the freon to prevent premature vaporization.
On some cabin pressurization systems, pressurization on the ground is restricted by the	main landing gear operated switch.
What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system?	Low-pressure vapor.
How is the cabin pressure of an aircraft maintained in flight?	By controlling the rate of the air flowing out of the cabin.
What is the condition of the refrigerant as it enters the evaporator of a vapor-cycle cooling system?	Low-pressure liquid.
The cabin pressurization modes of operation are	differential, unpressurized, and isobaric.
What is the condition of the refrigerant as it leaves the condenser of a vapor-cycle cooling system?	High-pressure liquid.
When a vapor-cycle cooling system is not in operation, what is an indication that the system is leaking freon?	Oil seepage.
When purging a freon air conditioning system, it is important to release the charge at a slow rate. What is the reason for the slow-rate discharge?	Prevent excessive loss of refrigerant oil.
A small amount of water in a vapor cycle cooling system can freeze	in the expansion valve and stop the entire system operation.
Oxygen systems in unpressurized aircraft are generally of the	continuous-flow and pressure-demand types.
Oxygen used in aircraft systems	is at least 99.5 percent pure and is practically water free.
Which is considered a good practice concerning the inspection of heating and exhaust systems of aircraft utilizing a jacket around the engine exhaust as a heat source?	Supplement physical inspections with periodic operational carbon monoxide detection tests.
Which oxygen system employs a regulator that operates only when the user inhales?	Continuous-flow system.
In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases?	Either a combustion air relief valve or a differential pressure regulator.
For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance?	Chemical oxygen generator systems.
If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause	moisture to collect in the bottle.
Composite oxygen bottles that conform to DOT-E-8162 have a service life of	15 years or 10,000 filling cycles whichever occurs first.
When charging a vapor-cycle cooling system after evacuation, the low-pressure gauge fails to come out of a vacuum. What is indicated?	Blockage in the system.
When an aircraft's oxygen system has developed a leak, the lines and fittings should be	bubble tested with a special soap solution manufactured specifically for this purpose.
What is the condition of the refrigerant as it enters the condenser of a vapor-cycle cooling system?	High-pressure vapor.
What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude?	Negative pressure relief valve.
What does a steady stream of bubbles indicate when servicing a vapor cycle air conditioning system?	The system is under charged.
The function of the evaporator in a freon cooling system is to	lower the temperature of the cabin air.
How often should standard weight high-pressure oxygen cylinders be hydrostatically tested?	Every 5 years.
How can it be determined that a vapor-cycle cooling system is charged with the proper amount of freon?	Air bubbles in the sight glass disappear.
In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin?	Pressure relief valves.
What is the purpose of a mixing valve in a compressor bleed air air conditioning system?	Control the supply of hot, cool, and cold air.
The basic air-cycle cooling system consists of	a source of compressed air, heat exchangers, and a turbine.
What component in a vapor-cycle cooling system would most likely be at fault if a system would not take a freon charge?	Expansion valve.
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 expansion valve is not metering freon properly.
The point at which freon flowing through a vapor-cycle cooling system gives up heat and changes from a gas to a liquid is the	condenser.
If the cabin rate of climb is too great, the control should be adjusted to cause the	outflow valve to close faster.
Turbine engine air used for air conditioning and pressurization is generally called	bleed air.
The primary function of the cabin pressurization system outflow valve is to	maintain the desired cabin pressure.
High-pressure cylinders containing oxygen for aviation use can be identified by their	green color and the words AVIATOR'S BREATHING OXYGEN stenciled in 1-inch white letters.
Which best describes cabin differential pressure?	Difference between the ambient and internal air pressure.
What may be used as a lubricant on oxygen system tapered pipe thread connections?	Teflon tape.
The function of an expansion valve in a freon cooling system is to act as a metering device and to	reduce the pressure of the liquid freon.
Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air conditioning?	Low or high pressure compressor.
Frost or ice buildup on a vapor-cycle cooling system evaporator would most likely be caused by	inadequate airflow through the evaporator.
What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant?	Receiver-dryer.
Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the	air cycle air conditioning.
The primary difference between aviation breathing oxygen and other types of commercially available compressed oxygen is that	aviation breathing oxygen has had all the water vapor removed.
The position of the thermostatic expansion valve in a vapor-cycle cooling system is determined by temperature and pressure of the	freon in the outlet of the evaporator.
On transport category aircraft what might be an indication of an over pressure event of the aircraft oxygen system?	The green thermal expansion disk missing.
If the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, the system should	be operated for a period of time to reach a stable condition and then the freon level rechecked.
In what position should the bottle be placed when adding liquid freon to a vapor-cycle cooling system?	Vertical with the outlet at the bottom.
The purpose of the airflow metering aneroid assembly found in oxygen diluter demand regulators is to	regulate airflow in relation to cabin altitude when in diluter demand position.
At which component in an air-cycle cooling system does air undergo a pressure and temperature drop?	Expansion turbine.
What is the main cause of contamination in a gaseous oxygen system?	Moisture.
What component might possibly be damaged if liquid refrigerant is introduced into the low side of a vapor-cycle cooling system when the pressure is too high or the outside air temperature is too low?	Compressor
What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system?	Calibrated orifice.
What is used in some oxygen systems to change high cylinder pressure to low system pressure?	Pressure reducer valve.
The purpose of the dump valve in a pressurized aircraft is to relieve	all positive pressure from the cabin.
How should you determine the amount of oxygen in a portable, high-pressure cylinder?	Read the pressure gauge mounted on the cylinder.

Created by: Jack Mollohan