Airframe 10 (Air Condition)

How is oxygen from a high-pressure bottle delivered at a low pressure for use?. Pressure reducer or regulator. Flow meter. Venturi tube.

On a pressure-demand oxygen system, when does the demand and regulator valve open?. Continuously. When the user breathes. When cabin altitude exceeds 10,000 ft.

Why should some oxygen be left in an oxygen cylinder?. To prevent freezing of the valve. To avoid contamination or prevent the cylinder from being completely empty. To maintain high-pressure reading.

How much oxygen is provided when "demand" is selected on a "diluter demand" oxygen system?. 50%. 75%. 100%.

What color are oxygen cylinders?. Green. Blue. White.

How do you evacuate an air conditioning vapor cycle system?. Using a vacuum pump. Using bleed air from the engines. Using cabin pressurization.

Why do you evacuate (or purge) an air conditioning vapor cycle system?. To remove trapped moisture. To increase system pressure. To filter refrigerant.

In an air-cooling system, what undergoes a pressure and temperature drop?. Refrigerant in the condenser. Air passing through the expansion chamber. Air entering the cabin.

Are auto-reset circuit breakers used in air conditioning systems?. Yes. No. Only in auxiliary systems.

Which component in an air-cycle system drops pressure and temperature when in use?. Heat exchanger. Expansion tube. Compressor.

Where is the air taken from on a vapor cycle system?. Outside ram air. Bleed air from engines. Cabin recirculation.

What does the cabin controller use to control differential in the isobaric range?. Cabin temperature. Cabin air. Cabin pressure switch.

What would happen when, in the isobaric range, the selector is moved to the open position?. Cabin altitude would decrease. Cabin altitude would increase. Cabin pressure would remain constant.

Which component in an air-cycle machine experiences the greatest pressure and temperature drop?. Expansion turbine. Heat exchanger. Compressor.

What is the air taken from the turbine engine compressor section called?. Ram air. Bleed air. Recirculated air.

When the isobaric valve is in the open position, what will happen to cabin pressure?. It increases slowly. Remains constant due to regulator bellows. Drops rapidly.

A particular aircraft is flying at 8,000 ft and cabin altitude is 3,500 ft. If the aircraft climbs to 9,500 ft, what would the cabin altitude be?. 3,800 ft. 4,000 ft. 4,500 ft.

What provides pressurization for a turbojet-powered aircraft?. Cabin air compressors. Bleed air from the turbo compressor. Air-cycle machine only.

How does the outflow valve work?. Controls cabin temperature. Regulates cabin pressure by manual or automatic control. Filters incoming air.

Where is air taken from for pressurization on a turbojet engine?. Supercharger. Exhaust manifold. Outside ram air.

What should be done if the rate of climb is too great?. Reduce engine power. Adjust the pressurization controller. Open cabin windows.

What controls the operation of the cabin pressure regulator?. Cabin air. Cabin temperature. Cabin pressure.

If the cabin rate of climb is too great, how should the controls be adjusted?. To cause the outflow valve to close faster. To open the outflow valve. To maintain cabin temperature.

In an aircraft heater, what does the thermostat control?. Fuel flow to the heater. Combustion air temperature via the fuel valve. Cabin temperature.