Daily Quiz Flashcards
What percent of the air is comprised of oxygen?
21%
What is one thing ozone does?
Blocks UV rays
How do the ratios of gases change with elevation?
No change
What drops as altitude increases?
Atmospheric pressure
How do you treat hyperventilation?
Calm the person down
What does carbon monoxide smell like?
Nothing, it’s odorless
How does carbon monoxide affect the human body?
Displaces oxygen
What is the effect of low doses of carbon monoxide over long periods of time?
Death
How does a carbon monoxide sticker detector work?
changes color
Exhaust shroud heaters may be a source of what?
Carbon Monoxide
How can hypoxia be overcome?
Increase cabin pressure
What is the primary method of avoiding hypoxia in small aircraft without pressurization?
Supplemental Oxygen
Up to what altitude does supplemental oxygen prevent hypoxia?
40,000 ft
What is the primary means a large transportation type aircraft prevent hypoxia?
Pressurized cabin
What happens when you combine petroleum with oxygen?
creates heat
What color are pressurized oxygen bottles used in aviation?
Green
What must be marked on oxygen bottles used in aviation?
Aviators Breathing Oxygen
What is produced by liquifying air and boiling off Nitrogen?
Oxygen
What is the purpose of a molecular sieve?
Produce Oxygen
What is the container that holds liquid oxygen called?
Dewar Bottle
Where is the liquid oxygen primarily used?
Military aircraft
How is liquid oxygen made?
Lowering the temperature
What percent of the air is comprised of oxygen?
21%
What is one thing ozone does?
Blocks UV rays
How do the ratios of gases change with elevation?
No change
What drops as altitude increases?
Atmospheric pressure
How do you treat hyperventilation?
Calm the person down
What does carbon monoxide smell like?
Nothing, it’s odorless
How does carbon monoxide affect the human body?
Displaces oxygen
What is the effect of low doses of carbon monoxide over long periods of time?
Death
How does a carbon monoxide sticker detector work?
changes color
Exhaust shroud heaters may be a source of what?
Carbon Monoxide
How can hypoxia be overcome?
Increase cabin pressure
What is the primary method of avoiding hypoxia in small aircraft without pressurization?
Supplemental Oxygen
Up to what altitude does supplemental oxygen prevent hypoxia?
40,000 ft
What is the primary means a large transportation type aircraft prevent hypoxia?
Pressurized cabin
What happens when you combine petroleum with oxygen?
creates heat
What color are pressurized oxygen bottles used in aviation?
Green
What must be marked on oxygen bottles used in aviation?
Aviators Breathing Oxygen
What is produced by liquifying air and boiling off Nitrogen?
Oxygen
What is the purpose of a molecular sieve?
Produce Oxygen
What is the container that holds liquid oxygen called?
Dewar Bottle
Where is the liquid oxygen primarily used?
Military aircraft
How is liquid oxygen made?
Lowering the temperature
What starts oxygen flow after oxygen masks drop?
Pull the lanyard
What mixes with oxygen in a diluter demand oxygen system?
Cabin air
How do you know that oxygen is flowing to the mask?
Flow indicator shows flow
What are high pressure oxygen tubes made of?
Stainless Steel
What are low pressure oxygen lines made of?
Aluminum
How are oxygen lines marked?
Green/White tape band with rectangle bars
What could happen if you raise the pressure in an oxygen system to quickly?
Creates heat that could ignite something
What visual indication do you have of thermal discharge of the oxygen system?
Green indicator disc blows out
What oxygen system avoids the use of long tubing runs and extra components?
Chemical oxygen system
What kind of fluid do you use to check for leaks in an oxygen system?
Oxygen safe detection fluid
This ensures the best chance of sealing oxygen system connections…
Torque to specification
The cascade method of servicing oxygen systems calls for what?
Start with the bottle with the lowest pressure first then work your way up
What do you use to seal the threads on flared fittings on oxygen system?
Nothing
How many inches from moving parts, electrical wires and fluid lines must oxygen system components be?
2 inches
Barometric pressure does what as altitude increases?
Goes down
Most flights occur where?
Troposphere
Cabin altitude is expressed in what units?
Feet above sea level
Cabin differential pressure is expressed in what units?
Pounds per square inch
Cabin rate-of-climb is expressed in what units?
Feet per minute
What does cabin differential pressure measure?
Difference in pressure between the cabin and outside ambient air
This ensures the best chance of sealing oxygen system connections…
Torque to specification
The cascade method of servicing oxygen systems calls for what?
Start with the bottle with the lowest pressure first then work your way up
What do you use to seal the threads on flared fittings on oxygen system?
Nothing
How many inches from moving parts, electrical wires and fluid lines must oxygen system components be?
2 inches
Barometric pressure does what as altitude increases?
Goes down
Most flights occur where?
Troposphere
Cabin altitude is expressed in what units?
Feet above sea level
Cabin differential pressure is expressed in what units?
Pounds per square inch
Cabin rate-of-climb is expressed in what units?
Feet per minute
What does cabin differential pressure measure?
Difference in pressure between the cabin and outside ambient air
This ensures the best chance of sealing oxygen system connections…
Torque to specification
The cascade method of servicing oxygen systems calls for what?
Start with the bottle with the lowest pressure first then work your way up
What do you use to seal the threads on flared fittings on oxygen system?
Nothing
How many inches from moving parts, electrical wires and fluid lines must oxygen system components be?
2 inches
Barometric pressure does what as altitude increases?
Goes down
Most flights occur where?
Troposphere
Cabin altitude is expressed in what units?
Feet above sea level
Cabin differential pressure is expressed in what units?
Pounds per square inch
Cabin rate-of-climb is expressed in what units?
Feet per minute
What does cabin differential pressure measure?
Difference in pressure between the cabin and outside ambient air
R134
An aircraft pressurization system must be capable of maintaining a cabin altitude of ________ ft or lower.
8000
What can be an issue with pressurized cabin aircraft?
Metal fatigue
What is a source of air for cabin pressurization in a reciprocating engine aircraft?
Turbocharger
What is a disadvantage of using a supercharger or turbocharger for cabin pressurization?
Takes power from the engine
Which source of air pressure is NOT mechanically coupled to the engine?
Turbocharger
Which type air source for cabin pressure has less risk for carbon monoxide contamination of cabin air?
Engine driven compressor
What is the source of air for cabin pressurization on turbine engine aircraft?
Bleed air
What uses the venturi effect to aid air volume into the cabin for pressurization?
Jet pump multiplier
What mode of cabin pressure control maintains a single cabin pressure despite altitude?
Isobaric mode
What mode of cabin pressurization maintains cabin pressure at a set differential psi?
Constant differential pressure mode
What is a typically desirable rate-of-change for cabin pressure?
300-500 ft/min
The maximum cabin differential pressure of an aircraft is dictated by what?
Aircraft design limits
The cabin pressure controller sends a signal directly to what component?
Pressure regulator
All pressurization systems have what feature for override?
Manual mode
How does an outflow valve maintain a set pressure?
It opens, closes and modulates
What power source will manually actuate outflow doors?
D/C
The cabin air pressure safety valve opens when…
a predetermined pressure differential is reached
Some outflow valves incorporate a safety valve function but you must have what?
Two total valves
What closes the outflow valve if true cabin pressure drops well below setting pressure?
Cabin altitude limiter
What ensures outside air pressure does not exceede inside air pressure?
Negative pressure relief valve
What may be a result of a negative pressure situation?
Structural damage
What may be used during an abnormal/maintenance or emergency situation to relieve cabin pressure?
Dump valves
At touchdown the WOW switch sends a signal to do what?
Open safety/dump valves
What air system has nozzles at each passenger station for ventilating air?
Gasper air system
What is provided to prevent wear-and-tear on engines and APU for aircraft pressure checks?
Ground receptacle for air
What type aircraft utilize Air-cycle air conditioning?
Turbine engine powered aircraft
What is NOT a possible source of air for the air-cycle air conditioning system?
Engine exhaust gas
What regulates bleed air into the air cycle system?
Pack valve
What directs bleed air around the ACM to mix with ACM output air to control temperature?
Bleed air bypass valve
What carries away heat within the primary heat exchanger in an air cycle system?
Outside ram air
How is air moved through the air cycle primary heat exchanger when on the ground?
Fan
What are the two components on a common shaft inside an ACM?
Compressor and turbine
What is the correct sequence of air flow in an ACM system?
Primary heat exchanger, compressor, secondary heat exchanger, turbine
What item coalesces moisture to remove water from the ACM output air?
Fiberglass sock
What item prevents water from freezing in the water separator?
Refrigeration bypass valve (35 deg valve)
What type of air conditioning system operates under the theory of evaporation and condensation?
Vapor cycle
What is the name of the type of energy that causes a substance to change state?
Latent heat energy
What type of heat energy raises actual substance temperature?
Sensible heat energy
Temperature rise above what is required to change freon from a liquid to a vapor is called what?
Superheat
Temperatures below what is required to change freon from a vapor to a liquid is called what?
Subcooling
The boiling point is dependent upon what?
Pressure
What are the two basic sides of a vapor cycle air conditioning system?
High and low
What side of a vapor cycle air conditioning system gives up heat?
High side
What side of a vapor cycle air conditioning system receives heat?
Low side
What two components divide the high side from low side in a vapor cycle air conditioning system?
Expansion valve and compressor
What type freon is the older type that has been replaced with a newer type?
R12
What is NOT a hazard of freon?
Poisonous
What freon type is better for the environment?
R134
