Final Review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 1. Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air conditioning? | show 🗑
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| 2. At which component in an air-cycle cooling system does air undergo a pressure and temperature drop? | show 🗑
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| show | A. Turbine engine compressor.
B. Ambient air.
C. Pressurized cabin air.
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| 4. What is ventilating air used for on a combustion heater? | show 🗑
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| show | A. compressed air.
B. ram air.
C. bleed air.
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| 6. In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases? | show 🗑
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| 7. How is the cabin pressure of an aircraft maintained in flight? | show 🗑
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| 8. What controls the operation of the cabin pressure regulator? | show 🗑
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| 9. The basic air-cycle cooling system consists of | show 🗑
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| 10. The purpose of the dump valve in a pressurized aircraft is to relieve | show 🗑
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| show | A. Compressor.
B. Condenser.
C. Evaporator.
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| 12. How can it be determined that a vapor-cycle cooling system is charged with the proper amount of freon? | show 🗑
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| 13. When charging a vapor-cycle cooling system after evacuation, the low-pressure gauge fails to come out of a vacuum. What is indicated? | show 🗑
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| 14. What component in a vapor-cycle cooling system would most likely be at fault if a system would not take a freon charge? | show 🗑
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| show | A. the mixing valve sticking closed.
B. moisture in the evaporator.
C. inadequate airflow through the evaporator.
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| 16. What test is used to determine the serviceability of an oxygen cylinder? | show 🗑
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| 17. How often should standard weight high-pressure oxygen cylinders be hydrostatically tested? | show 🗑
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| show | A. 24 years or 4,380 filling cycles.
B. 15 years or 10,000 filling cycles.
C. 10 years or 5,000 filling cycles.
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| 19. Which oxygen system employs a regulator that operates only when the user inhales? | show 🗑
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| 20. The component that determines the pressure level in the cabin is the cabin air pressure | show 🗑
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| 21. Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the | show 🗑
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| show | A. Chemical oxygen generator systems.
B. High-pressure oxygen systems.
C. Low-pressure oxygen systems.
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| show | A. Moisture.
B. Dust.
C. Nitrogen.
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| show | A. Refrigeration unit compressor.
B. Secondary heat exchanger.
C. Expansion turbine.
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| 25. 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 | show 🗑
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| show | A. condenser.
B. evaporator.
C. expansion valve.
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| show | A. By a pressure-sensitive switch that causes the pressurization pump to turn on or off as required
B. By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set
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| 28. 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? | show 🗑
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| show | A. main landing gear operated switch.
B. cabin pressure regulator.
C. negative pressure-relief valve.
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| show | A. outflow valve opening.
B. pneumatic system pressure.
C. inflow valve opening.
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| 31. The function of the evaporator in a freon cooling system is to | show 🗑
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| show | A. Control the supply of hot, cool, and cold air.
B. Distribute conditioned air evenly to all parts of the cabin.
C. Combine ram air with conditioned air.
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| 33. What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude? | show 🗑
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| show | A. be operated and a pressure check performed.
B. be operated for a period of time to reach a stable condition and then the freon level rechecked.
C. not be operated until freon and oil have been added.
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| show | A. outflow valve to close slower.
B. outflow valve to close faster.
C. cabin compressor speed to decrease.
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| 36. The position of the thermostatic expansion valve in a vapor-cycle cooling system is determined by temperature and pressure of the | show 🗑
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| show | A. transfer heat from the freon gas to ambient air.
B. change liquid freon into a gas before it enters the compressor.
C. transfer heat from the cabin air to the liquid freon.
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| 38. The function of an expansion valve in a freon cooling system is to act as a metering device and to | show 🗑
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| 39. Which prevents a sudden loss of pressurization in the event that there is a loss of the pressurization source? | show 🗑
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| show | A. check oil and add as necessary, evacuate the system, relieve vacuum, and add freon.
B. check oil and add as necessary, evacuate the system, and add freon.
C. check oil and add as necessary, and add freon.
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| 41. The primary function of the cabin pressurization system outflow valve is to | show 🗑
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| 42. One purpose of a jet pump in a pressurization and air conditioning system is to | show 🗑
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| 43. After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and | show 🗑
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| 44. The operation of an aircraft combustion heater is usually controlled by a thermostat circuit which | show 🗑
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| 45. The air-cycle cooling system produces cold air by | show 🗑
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| 46. What does a steady stream of bubbles indicate when servicing a vapor cycle air conditioning system? | show 🗑
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| 47. An aircraft pressurization cycle is normally considered to be | show 🗑
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| 48. Which best describes cabin differential pressure? | show 🗑
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| 49. Composite oxygen bottles that conform to DOT-E-8162 have a service life of | show 🗑
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| show | A. isobaric, differential, and maximum differential.
B. differential, unpressurized, and isobaric.
C. ambient, unpressurized, and isobaric.
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| show | A. bleed air pressure, outside air temperature, and cabin rate of climb.
B. barometric pressure, cabin altitude, and cabin rate of change.
C. cabin rate of climb, bleed air volume, and cabin pressure.
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| 52. What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant? | show 🗑
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| 53. What is the condition of the refrigerant as it enters the condenser of a vapor-cycle cooling system? | show 🗑
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| show | A. High-pressure liquid.
B. Low-pressure liquid.
C. High-pressure vapor.
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| 55. The evacuation of a vapor-cycle cooling system removes any water that may be present by | show 🗑
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| show | A. Low-pressure liquid.
B. Low-pressure vapor.
C. High-pressure vapor.
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| show | A. Low-pressure liquid.
B. High-pressure liquid.
C. High-pressure vapor.
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| show | A. Vertical with the outlet at the top.
B. Horizontal with the outlet to the side.
C. Vertical with the outlet at the bottom.
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| 59. 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? | show 🗑
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| show | A. Oil seepage.
B. Bubbles in the sight glass.
C. An ozone-like odor in the immediate area.
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| show | A. The system is functioning normally.
B. The expansion valve is not metering freon properly.
C. The compressor is pumping too much refrigerant.
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| show | A. augment the cooling capacity during periods of peak demand.
B. aid in quick cooling a hot aircraft interior.
C. cool the freon to prevent premature vaporization.
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| show | A. in the receiver-dryer and stop the entire system operation.
B. in the expansion valve and stop the entire system operation.
C. but the system is designed to continue operation.
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| 64. When Refrigerant-12 is passed over an open flame, it | show 🗑
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| 65. What type of oil is suitable for use in vapor-cycle cooling system? | show 🗑
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| 66. When an aircraft's oxygen system has developed a leak, the lines and fittings should be | show 🗑
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| show | A. the pressure reducer to fail.
B. the automatic altitude control valve to open.
C. moisture to collect in the bottle.
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| 68. What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system? | show 🗑
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| 69. In the diluter demand oxygen regulator, when does the demand valve operate? | show 🗑
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| 70. The primary difference between aviation breathing oxygen and other types of commercially available compressed oxygen is that | show 🗑
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| 71. What is used in some oxygen systems to change high cylinder pressure to low system pressure? | show 🗑
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| show | A. Check valve.
B. Pressure relief valve.
C. Manifold control valve.
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| 73. High-pressure cylinders containing oxygen for aviation use can be identified by their | show 🗑
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| 74. An aircraft oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified | show 🗑
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| 75. In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin? | show 🗑
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| show | A. To permit the aircraft to operate in thunderstorms.
B. To allow aircraft systems to operate properly.
C. To make human flight possible in the hostile environment of the upper atmosphere.
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| show | A. is at least 99.5 percent pure and is practically water free.
B. is at least 99.5 percent pure and is the same as hospital-quality oxygen.
C. contains a higher level of water vapor than hospital-quality oxygen.
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| show | A. continuous-flow and pressure-demand types.
B. pressure-demand type only.
C. portable-bottle type only.
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| 79. The purpose of the airflow metering aneroid assembly found in oxygen diluter demand regulators is to | show 🗑
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| show | A. aircraft manufacturer or the cylinder manufacturer.
B. Department of Transportation.
C. National Transportation Safety Board or the Standards of Compressed Gas Cylinders.
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| show | A. hydrostatically tested within the proper time interval.
B. approved by the National Transportation Safety Board.
C. inspected by a certificated airframe mechanic.
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| 82. A contaminated oxygen system is normally purged with | show 🗑
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| 83. How should you determine the amount of oxygen in a portable, high-pressure cylinder? | show 🗑
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| 84. What may be used as a lubricant on oxygen system tapered pipe thread connections? | show 🗑
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| show | A. The green thermal expansion disk missing.
B. The green thermal expansion disk in the cockpit missing.
C. The green thermal expansion disk on the oxygen regulator missing.
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| 86. Which of the following are characteristics of a chemical or solid-state oxygen system? | show 🗑
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Created by:
cpeters2