Airframe Written
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| 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
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| At which component in an air-cycle cooling system does air undergo a pressure and temperature drop? | expansion turbine
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| 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
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| 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.
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| The function of the condenser in a freon cooling system is to | transfer heat from the freon gas to ambient air
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| The purpose of a subcooler in a vapor-cycle cooling system is to | cool the freon to prevent premature vaporization
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| Which oxygen system employs a regulator that operates only when the user inhales? | continuous-flow system
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| 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 properly
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| How often should standard weight high-pressure oxygen cylinders be hydrostatically tested? | Every 5 years
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| 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
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| Oxygen systems in unpressurized aircraft are generally of the | continuous-flow and pressure-demand types
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| 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
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| After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and | all connections checked for leaks
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| For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance? | Chemical oxygen generator systems
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| What controls the operation of the cabin pressure regulator? | Cabin altitude
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| 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
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| When Refrigerant-12 is passed over an open flame, it | changes to phosgene gas
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| The purpose of the dump valve in a pressurized aircraft is to relieve | all positive pressure from the cabin
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| Composite oxygen bottles that conform to DOT-E-8162 have a service life of | 15 years or 10.000 filling cycles whichever occurs first
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| When a vapor-cycle cooling system is not in operation, what is an indication that the system is leaking freon? | oil seepage
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| (Refer to Figure 13.) Determine what unit is located immediately downstream of the expansion valve in a freon refrigeration system. | Evaporator coils
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| In a high-pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream? | Pressure relief valve
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| 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
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| 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
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| 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
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| 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
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| If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the | Department of Transportation
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| Frost or ice buildup on a vapor-cycle cooling system evaporator would most likely be caused by | inadequate airflow through the evaporator
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