2AX5X Volume 3
- 1.In its natural state oxygen is?
- A.
Tasteless, colorless, and odorless
- B.
Tasteless, volumeless and odorless
- C.
Tasteless, colorless, and Weightless
- D.
Volumesless, weightless and colorless
- 2.What gaseous oxygen (GOX) system valve type prevents a complete loss of oxygen?
- A.
Filler
- B.
Check
- C.
Shutoff
- D.
Pressure-reducing
- 3.The supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape that is
- A.
Brown and orange
- B.
blue and yellow
- C.
Green and white
- D.
Black and red
- 4.The disadvantage of a continuous-flow oxygen regulator is that it
- A.
Wastes oxygen
- B.
Is usable below 10,000 feet
- C.
Is usable only above 20,000 feet
- D.
Delivers oxygen at varying pressures
- 5.What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?
- A.
16 man-minutes of oxygen
- B.
93 percent oxygen-enriched gas.
- C.
97 percent nitrogen-enriched gas.
- D.
100 percent oxygen-enriched gas.
- 6.Liquid oxygen (LOX) converts to gaseous oxygen (GOX) at an expansion ratio of
- A.
600 to 1
- B.
680 to 1
- C.
800 to 1
- D.
860 to 1
- 7.Except during servicing, the liquid oxygen (LOX) system’s combination fill, buildup, and vent valve is always in the
- A.
Fill position
- B.
Vent position
- C.
Normal position
- D.
Buildup position
- 8.On an aircraft liquid oxygen (LOX) system, the handle on a manually operated buildup and vent valve is designed to prevent
- A.
Slow pressure buildup
- B.
Rapid venting of system pressure
- C.
LOX system pressure loss during maintenance
- D.
The filler access door from closing in the vent position
- 9.Bleed air is usually taken from which part of the engine section?
- A.
Intake
- B.
Turbine
- C.
Exhaust
- D.
Compressor
- 10.Aircraft engine temperature and pressure as it applies to the bleed air system is determined by the
- A.
Ambient pressure and ambient temperature.
- B.
Engine throttle setting and ambient altitude.
- C.
Ambient pressure and engine throttle setting.
- D.
Engine throttle setting and ambient temperature.
- 11.What is the purpose of the engine bleed air (EBA) check valves?
- A.
Prevent the loss of compressed bleed air.
- B.
Maintain balanced airflow from each engine.
- C.
Provide a primary source for compressed bleed air.
- D.
Reduce bleed air pressure when the pressure is too high.
- 12.What engine bleed air (EBA) component prevents loss of air through the engine when it is shutdown
- A.
Check valve
- B.
Shutoff valve.
- C.
Isolation valve
- D.
Crossover valve.
- 13.The ducting for high-pressure/high-temperature air-conditioning is usually made of
- A.
Titanium.
- B.
Aluminum.
- C.
Stainless steel.
- D.
Aluminum/nickel alloy.
- 14.What tool do you use to ensure alignment and sealing when installing a V-band clamp on air-conditioning ducting
- A.
Screwdriver
- B.
Center punch.
- C.
Rawhide mallet.
- D.
Ball peen hammer.
- 15.What type of high-pressure/high-temperature ducting does not require a gasket?
- A.
Clamp flange.
- B.
Bolted flange.
- C.
Beaded flange.
- D.
Compressible flange
- 16.What lubricant can be used on a beaded channel clamp sleeve to ease installation?
- A.
Soap.
- B.
Water
- C.
Grease
- D.
Silicone.
- 17.The crush-type gasket used in aircraft ducting is made of
- A.
Fiber and fiberglass
- B.
Fiberglass and neoprene, or rubber
- C.
A soft aluminum, or fiber and metal mesh.
- D.
A soft aluminum, and fiber reinforced rubber or plastic.
- 18.Expansion joints in bleed air systems are best used for
- A.
Ram air ducting.
- B.
A long run of ducting.
- C.
A short run of ducting.
- D.
Low-temperature/low-pressure ducting.
- 19.What prevents fiberglass fabric ducts from swelling when the aircraft climbs to high altitudes?
- A.
Thermal compensators.
- B.
Expansion bellows
- C.
Puckered flaps.
- D.
Vent holes.
- 20.What is defined as “a depression in the duct wall, where the surface of the material isn’t cut or removed but the depression has caused sharp bends or creases in the material?”
- A.
Minor dent.
- B.
Major dent.
- C.
Scratch.
- D.
Gouge.
- 21.“The simultaneous control of temperature, humidity, and air distribution within a space” is the definition of
- A.
Engine bleed air.
- B.
Air conditioning.
- C.
Pressurization.
- D.
Air control.
- 22.What aircraft air conditioning system component is a radiator that cold ram air passes through in order to cool the hot bleed air from the engine(s)?
- A.
Primary heat exchanger.
- B.
Air cycle machine.
- C.
Water separator.
- D.
Air cooler.
- 23.What aircraft air conditioning system component controls the flow of ram air through the primary heat exchangers?
- A.
Air cycle machine.
- B.
Refrigeration bypass valve.
- C.
Movable inlet and exit doors
- D.
Primary ram air controller assemblies.
- 24.The rapid cooling of bleed air causes
- A.
The air pressure to increase.
- B.
Moisture to condense in the form of fog.
- C.
Ice to form in the secondary heat exchanger.
- D.
A loss of pressure as it exits the air cycle machine compressor.
- 25.As bleed air enters the compressor of the air cycle machine, its pressure is increased. With the increase in pressure, there is also an increase in temperature. Which component removes most of this increased temperature?
- A.
Primary heat exchanger.
- B.
Secondary heat exchanger
- C.
Air cycle machine bypass valve.
- D.
Air cycle machine expansion turbine.
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