Learn: Aircraft systems II test 3

Oxygen _________________ (does or does not) burn.

does not

A decrease in the temperature of the air causes the density to _________________ (increase or decrease).

increase

A decrease in the pressure of the air causes the density to _________________ (increase or decrease).

decrease

The two gases that make up the majority of the atmosphere are _________________ and _________________ .

nitrogen and oxygen

Long exposure at an altitude of 10,000 feet without supplemental oxygen will result in __________________ and fatigue.

headaches

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

hypoxia

The rate and depth of our breathing is controlled by _______________________ in our blood.

carbon dioxide

Carbon monoxide is dangerous because it takes the place of the _______________ the brain needs to function.

Oxygen

The basic difference between ice, water, and steam is the amount of ____________________ each contains.

Heat energy

The basic unit of heat in the U.S. system is the _____________________________ , and in the metric system it is the ________________ .

British thermal unit, calorie

Heat energy that causes a material to change its temperature is called _________________ heat.

sensible

Heat energy that causes a material to change its physical state without changing its temperature is called _______________ heat.

latent

The two reference points used for measuring temperature are:

a. __________________________________

b. __________________________________

a. the freezing point of water

b. the boiling point of water

Absolute zero is the temperature at which there is no __________________ motion.

molecular

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

Kelvin

Pressure that is referenced from zero pressure is called _________________ pressure.

absolute

Pressure that is referenced from the existing atmospheric pressure is called _____________ pressure.

Gage

Pressure that is referenced from another pressure is called _____________________ pressure.

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

Three methods of heat transfer are:

a. _______________________________________

b. _______________________________________

c. _______________________________________

A. Conduction

B. Convection

C. Radiation

A vacuum is usually measured in units of __________________________ .

inches of mercury

A "deep vacuum" is usually measured in units of _________________ .

Microns

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 candle

Aviators' oxygen is different from hospital oxygen because of its low ______________ content.

Water

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

water

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 sieve

The rate of release of the oxygen from a chemical oxygen generator system ________________ (may or may not) be adjusted for the altitude flow.

may not

The generators used in a chemical oxygen generator system are inert below ____________ ° F even under a severe impact.

400

Supplemental oxygen is normally provided for passengers of a pressurized aircraft by the ________________________ (continuous-flow or demand)-type system.

continuous flow

In a continuous-flow 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

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

pressure relief

Two types of regulators that may be used in a continuous-flow oxygen system are _______________ and __________________ regulators.

manual and automatic

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

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

A rebreather-bag-type oxygen mask is used with a ________________________ (continuous-flow or demand)-type oxygen system.

continuous flow

The cockpit crew of a pressurized aircraft normally have their supplemental oxygen supplied by a _______________ (continuous-flow or demand)-type oxygen system.

demand

A diluter-demand oxygen regulator dilutes the oxygen it meters at the lower altitudes with __________________ .

Cabin air

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

inhales

High-pressure oxygen cylinders installed in an aircraft must meet the specifications of the ____________________________________ or the ___________________________________ .

Interstate Commerce Commission (ICC), Department of Transportation (DOT)

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

hydrostatically

Standard high-pressure oxygen cylinders should be hydrostatically tested every __________ years.

5

Lightweight high-pressure oxygen cylinders should be hydrostatically tested every __________ years.

3

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

3,083

A lightweight high-pressure oxygen cylinder should be retired from service after ___________ years.

24

The pressure inside an oxygen bottle should never be allowed to drop below ___________ psi.

50

High-pressure oxygen bottles are painted ______________ .

green

Low-pressure oxygen bottles are painted _______________ .

yellow

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

pressure

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.

1,925

Any time an oxygen system has been opened, it should be purged for about ___________ minutes to remove all of the air from the oxygen lines.

10

Thread lubricants used with oxygen system components must contain no ________________ .

petroleum

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

nonpetroleum

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

Thread lubricants approved for use in an oxygen system have a/an ______________ base.

water

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

turbocharger

Two types of mechanical compressors used to supply pressurizing air for a reciprocating-engine-powered airplane are:

a. _____________________________________

b. _____________________________________

A. Roots blower type

B. Centrifugal 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

In a turbine-engine-powered aircraft the air for pressurization comes from the ___________________ section of the engine.

compressor

The air used for pressurizing a turbine-engine-powered aircraft is called ______________________ air.

compressor bleed

The cabin altitude is the same as the flight altitude when the aircraft is operating in the ______________________ mode.

unpressurized

The cabin altitude is maintained at a constant value as the flight altitude changes when the pressurization system is operating in the _________________ mode.

isobaric

The cabin pressure is maintained a given amount higher than the outside air pressure when the pressurization system is operating in the ______________________________ mode.

constant differential

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

aircraft structure

The amount of air the cabin pressure regulator (Figure above) allows to leave the cabin is determined by the ___________________________ pressure.

reference chamber

When the cabin pressure regulator (Figure above) is operating in the isobaric mode, cabin pressure is held constant by reducing the flow of reference-chamber air through the isobaric _________________ valve.

Metering

Refer to (Figure above). Anytime an increase in cabin pressure causes the isobaric metering valve to move toward the OPEN position, the outflow valve ______________ (opens or closes).

opens

Refer to (Figure above). 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 manufacturer, the differential metering valve ______________ (opens or closes).

opens

Refer to (Figure above). The isobaric metering valve is controlled by the ________________ (bellows or diaphragm).

bellows

Refer to (Figure above). The differential metering valve is controlled by the __________________ (bellows or diaphragm).

diaphragm

If the cabin rate of climb is too great, the rate control will cause the outflow valve to close _______________ (faster or slower).

faster

A negative-pressure relief valve is incorporated in a pressurization system to prevent cabin pressure ever becoming ______________ (lower or higher) than the surrounding air pressure.

lower

All positive pressure inside the cabin is relieved when the aircraft is on the ground by the ____________ valve opening.

dump

If "auxiliary ventilation" is selected on the pressurization control while cruising at altitude, cabin pressurization will be dumped, and the cabin altitude will _________________ (increase or decrease).

Increase

Airflow is increased in some areas of an aircraft by using a __________________________ to augment the airflow.

Jet pump

Aircraft that are heated with exhaust system heaters should have ________________________ detectors installed on the instrument panel.

carbon monoxide

Two types of airflow through a combustion heater are ____________________ air and ____________________ air.

combustion, 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

Regular maintenance of a combustion heater consists of cleaning or replacing the fuel _______________ and checking all connections for _________ .

filter, leaks

The temperature produced by a combustion heater is controlled by the thermostat which controls the _____________ going to the heater.

fuel

Heat for the cabin of a jet transport airplane is provided by _________________________ air.

compressor 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

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

primary

After the air leaves the primary heat exchanger it is heated as it is compressed by the _____________________ compressor.

Centrifugal

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

secondary

More heat is removed from the pressurizing air after it leaves the secondary heat exchanger as it spins the __________________________ which drives the centrifugal compressor.

expansion turbine

The final stage of cooling is done when the air ________________ upon leaving the turbine.

expands

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

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

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

Evaporator

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

condenser

The refrigerant enters the evaporator as a ____________ (high or low)-pressure _______________ (liquid or vapor).

low, liquid

The refrigerant leaves the evaporator as a ____________ (high or low)-pressure ______________ (liquid or vapor).

low, vapor

The refrigerant enters the condenser as a _____________ (high or low)-pressure ______________ (liquid or vapor).

high, vapor

The refrigerant leaves the condenser as a _____________ (high or low)-pressure ________________ (liquid or vapor).

high, liquid

The receiver-dryer holds the refrigerant in its _______________ (liquid or vapor) state.

liquid

The two units that divide an air conditioning system into a high side and a low side are the ________________________________ and the ___________________ .

thermostatic expansion valve, compressor

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

compressor

Cycling of a compressor that is belt-driven from the aircraft engine is accomplished by using an electromagnetic _______________ in the drive pulley.

clutch

The condenser is in the _____________ (high or low) side of an air conditioning system.

high

The air conditioning system component that meters liquid refrigerant into the evaporator coils is the _____________________________________ .

Thermostatic expansion valve