Cabin pressure

A decrease in the temperature of the air causes the density to. Decrease. Increase.

A decrease in the pressure of the air causes the density to. Decrease. Increase.

The two gases that make up the majority of the atmosphere are _____ AND. Nitrogen, oxygen. Oxygen , helium.

Oxygen____ burn. Does. Does not.

Long exposure at an altitude of 10_,000 feet without supplemental oxygen will result in$__ AND fatigue. Headache. Corrosion.

A condition in which the human body is deprived of the oxygen it needs is called. Hypoxia. Hypoxemya.

The rate and depth of our breathing is controlled by ________ un our blood. Carbon dioxide. Hydrogen.

Carbon monoxide is dangerous because it takes the place of the ___ the brain needs to function. Oxygen. Hydrogen.

The basic difference between ice, water, and steam is the amount of _____ each contains. Heat Energy. Electry Energy.

. The basic unit of heat in the English system is the ____ AND. Un the metric system ir Is the ____. British thermal unit, calorie. Caloriie, kelvin.

Heat energy that causes a material to change its temperature is called. Sensible. Latent.

Heat energy that causes a material to change its physical state without changing its temperature is called___heat. Sensible. Latent.

The two reference points used for measuring temperature are: The freezing point of water, the boiling point of water. The boiling point water, the british thermal.

Absolute zero is the temperature at which there is no _____motion. Molecular. Nonmolecular.

The absolute temperature scale that uses the same graduations as the Celsius scale is the ______ scale. Kelvin. Celsius.

. Pressure that is referenced from zero pressure is called_______ pressure. Absolute. Gage.

Pressure that is referenced from the existing atmospheric pressure is called____ pressure. Gage. Differential.

Pressure that is referenced from another pressure is called______ pressure. Gage. Differential.

The number of Btu of heat energy needed to change the temperature of one pound of a substance one degree Fahrenheit is called the_________ of the substance. Specific heat. Specific cold.

Three methods of heat transfer are: Conduction, convection, radiation. Radiation, current, electric.

A vacuum is usually measured in units of. Inches of Mercury. Inches of Titanium.

A "deep vacuum" is usually measured in units of. Microns. Macrons.

When oxygen is needed for a backup in a pressurized aircraft the _______ _______ _ system is used because of its simplicity, efficiency, and minimum maintenance required. Chemical oxygen chandle. Chemical hydrogen.

Aviators oxygen is different from hospital oxygen because of its low _______ content. Water. Oil.

The type of contaminant most generally found in gaseous oxygen systems is. Water. Vapor.

In the onboard oxygen generating system (OBOGS), engine compressor bleed air flows through beds of a _ _ _____ _____ material that mechanically filters the oxygen from the nitrogen and other constituents of the air. Molecular si. Nonmolecular.

The rate of release of the oxygen from a chemical oxygen candle system _____ be adjusted for the altitude flow. May. Mayo not.

The generators used in a chemical oxygen candle system are inert below ______ °F even under a severe impact. 500. 400.

Supplemental oxygen is normally provided for passengers of a pressurized aircraft by the_____________ type system. Continuos flow. Demand.

. In a continuous-!low oxygen system, the pressure of the oxygen in the high-pressure cylinder is reduced before it goes to the regulator by a/an ______valve. Pressure reducer. Pressure relief.

If the pressure reducer valve in a continuous-flow oxygen system should malfunction, a ____________ valve will prevent damage to the system. Pressure reducer. Pressure relief.

Two types of regulators that may be used in a continuous-flow oxygen system are ______ _ and _______regulators. Manual, automatic. Automatic, semiautomatic.

The amount of oxygen a regulator will deliver to flow to a continuous-flow mask is determined by a ____________ in the mask outlet. Calibrated orifice. Calibrated holes.

The continuous-flow oxygen mask worn by a person with a known respiratory or heart problem should receive its oxygen from a ________mask outlet. Therapeutic. Thermal.

. A rebreather-bag-type oxygen mask is used with a______type oxygen system. Continuos flow. Demand.

The cockpit crew of a pressurized aircraft normally have their supplemental oxygen supplied by a________ type oxygen system. Continuos flow. Demand.

A diluter-demand oxygen regulator dilutes the oxygen it meters at the lower altitudes with. Cabin air. Passenger air.

The demand valve on a diluter-demand oxygen regulator opens each time the wearer of the mask. Inhales. Mask.

High-pressure oxygen cylinders installed in an aircraft must meet the specifications of the ________________ orthe ________________. Interstate commerce misión( ICC) , department of transportation( doy). Interstate commerce misión, air transport.

. Oxygen cylinders are required to be ____________ tested periodically and the date of the test stamped on it. Hydrostatically. Mechanically.

Standard high-pressure oxygen cylinders should be hydrostatically tested every _____ years. 5. 3.

Lightweight high-pressure oxygen cylinders should be hydrostatically tested every _____ years. 5. 3.

. A lightweight high-pressure oxygen cylinder should be hydrostatically tested to a pressure of ______ psi. 3083. 3069.

A lightweight high-pressure oxygen cylinder should be retired from service after _____ years. 12. 15.

The pressure inside an oxygen bottle should never be allowed to drop below _ _ ___ psi. 50. 80.

High-pressure oxygen bottles are painted. Green. Yellow.

Low-pressure oxygen bottles are painted. Green. Yellow.

The amount of oxygen in a gaseous oxygen bottle is indicated by its. Pressure. Torque.

If a gaseous oxygen system is to be charged to 1,850 psi at 70°F when the ambient temperature is 60°F, the filling pressure should be ____ psi. 1925. 1935.

Any time an oxygen system has been opened, it should be purged for about _____ minutes to remove a ll of the air from the oxygen lines. 10. 20.

Thread lubricants used with oxygen system components must contain no. Petroluem. Nonpetolum.

Leaks in an oxygen system are located by spreading a __________ soap solution over the suspected area and watching for bubbles. Nonpetroleum. Petroleum.

A blowout plug on the side of the fuselage will be blown out if the oxygen system has been discharged through the. Pressure relief valve. Pressure outle valve.

Thread lubricants approved for use in an oxygen system have alan _______ base. Vapor. Water.

Pressurization air for reciprocating-engine-powered general aviation aircraft is compressed by the. Turbocharger. Turbochamber.

Two types of mechanical compressors used to supply pressurizing air for a reciprocating-engine-powered airplane are: Roots blower type, centrifugal type. Centrifugal. Type , pressure type.

When two or more mechanical air compressors supply the cabin pressure for a pressurized aircraft, the loss of cabin pressure if one compressor should fail is prevented by a delivery air duct ____________ _ valve. Check. Relief.

In a turbine-engine-powered aircraft the air for pressurization comes from the ________________ __ section of the engine. Combustion. Compressor.

The air used for pressurizing a turbine-engine-powered aircraft is called --------------------- air. Compressor bleed. Turbine bleed.

The cabin altitude is the same as the flight altitude when the aircraft is operating in the ______________ __ mode. Isobaric. Metric.

The cabin altitude is the same as the flight altitude when the aircraft is operating in the ______________ __ mode. Unpressurized. Pressurized.

The cabin pressure is maintained a given amount higher than the outside air pressure when the pressuriza- tion system is operating in the _______mode. Constant differential. Constant gauge.

The maximum differential pressure allowed in a pressurized aircraft is determined by the strength of the. Aircraft structure. Aircraft propeller.

The amount of air the cabin pressure regulator in Figure 9-23 allows to leave the cabin is determined by _________ the pressure. Reference number. Reference alpha.

When the cabin pressure regulator in Figure 9-23 is operating in the isobaric mode, cabin pressure is held constant by reducing the now of reference-chamber air through the isobaric_______ valve. Metering. Relief.

Refer to Figure 9-23. Anytime an increase in cabin pressure causes the isobaric metering valve to move toward the OPEN position, the outflow valve. Opens. Closes.

Refer to Figure 9-23. When the outside air pressure decreases enough that the difference between the cabin pressure and the outside pressure reaches the pressure-differential limit allowed by the airframe manufac- turer, the differential metering valve. Opens. Closes.

Refer to Figure 9-23. The isobaric metering valve is controlled by the. Bellows. Diaphgram.

Refer to Figure 9-23. The differential metering valve is controlled by the. Belows. Diaphgram.

lf the cabin rate of climb is too great, the rate control will cause the outflow valve to close. Faster. Slower.

A negative-pressure relief valve is incorporated in a pressurization system to prevent cabin pressure ever becoming ________ than the surrounding air pressure. Lower. Higher.

All positive pressure inside the cabin is relieved when the aircraft is on the ground by the _____ _ valve opening. Dump. Pump.

If "auxiliary ventilation" is selected on the pressurization control while cruising at altitude, cabin pressur- ization will be dumped, and the cabin altitude will. Increase. Decrease.

Airflow is increased in some areas of an aircraft by using a _____________ to augment the airflow. Jet pump. Turbine pump.

Aircraft that are heated with exhaust system heaters should have ____________ detectors installed on the instrument panel. Carbon,monoxide. Carbon dioxide.

Two types of airflow through a combustion heater are __________ air and _ ________ air. Combustion, ventilatin. Compressor, ventilating.

Too much combustion air is prevented from flowing through a combustion heater by either a combustion air_________ valve or a _________regulator. Relief, differential pressure. Check, differential pressure.

Regu lar ma intenance of a combustion heater consists of cleaning or replacing the fuel _______ _ and checking all connections for______. Filter, leaks. Valve, leaks.

The temperature produced by a combustion heater is controlled by the thermostat which controls the _ ______ going to the heater. Fuel. Oxygen.

Heat for the cabin of a jet transport airplane is provided by ____ air. Compressor bleed. Turbine bleed.

In a jet transport airplane, hot compressor bleed air is mixed with cold air from the ________ _ machine to get air of the correct temperature for the cabin. Air cycle. Vapor cycle.

The first heat that is lost from the hot compressor bleed air in an air-cycle machine is removed by the _ _ _ ____ heat exchanger. Primary. Secondary.

After the air leaves the primary heat exchanger it is heated as it is compressed by the __________ compressor. Centrifugal. Axial.

After leaving the air-cycle machine centrifugal compressor the air gives up some of its heat as it passes through the_______ heat exchanger. Primary. Secondary.

More heat is removed from the pressuri zing air after it leaves the secondary heat exchanger as it spins the ___________which drives the centrifugal compressor. Expansión turbine. Expansión compressor.

The final stage of cooling is done when the air ___ ____ _ upon leaving the turbine. Expans. Expansion.

Moisture that condenses from the pressurizing air after it leaves the expansion turbine is removed by the. Fuel separator. Water separator.

Water is prevented from freezing in the water separator by routing some _________ around the air-cycle machine to mix with cold air and raise its temperature. Warm air. Warm fuel.

. In a vapor-cycle cooling system, heat from the cabin is absorbed into the refrigerant in the. Evaporator. Condenser.

Heat taken from the cabin is transferred into the outside air by the. Evaporator. Condenser.

The refrigerant enters the evaporator as a ______ -pressure ______. Low-liquid. Low-vapor.

The refrigerant leaves the evaporator as a _ _____ -pressure _____. Low- liquid. Low-vapor.

The refrigerant enters the condenser as a ______ pressure _____. High-liquid. High-vapor.

The refrigerant leaves the condenser as a _ _____ -pressure _______. High-liquid. High-vapor.

The receiver-dryer holds the refrigerant in its _______ state. Liquid. Vapor.

The two units that divide an air conditioning system into a high side and a low side are the _ ___________ __ andthe_________. Thermostatic expansión Valve,. Compressor. Pressure relief Valve, compressor.

. The component in an air conditioning system that increases both the temperature and the pressure of the gaseous refrigerant is the. Compressor. Turbine.

Cycling of a compressor that is belt-driven from the aircraft engine is accomplished by using an electro- magnetic _______in the drive pulley. Clucth. Dump.

The condenser is in the _ _ _ ___ side of an air conditioning system. High. Low.

The air conditioning system component that meters liquid refrigerant into the evaporator coils is the. Thermostatic expansión valve. Pressure relief valve.

The evaporator is in the _ _____ side of an air conditioning system. Low. High.

The air leaving the evaporator of a properly functioning air conditioning system should have a temperature of between ____F and °F. 35, 45. 20 ,45.

When using an electronic leak detector, the probe should be held ______ a location of a suspected leak. Above. Below.