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A&P - Airframe > Cabin Atmosphere Control Systems > Flashcards

Cabin Atmosphere Control Systems Flashcards

1
Q

In a typical high pressure-pneumatic system, if the moisture separator does not vent accumulated water when the compressor shut down, a likely cause is a

A

malfunctioning solenoid dump valve

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2
Q

Which section of a turbine engine provides high pressure bleed air to an air cycle machine for pressurization and air-conditioning?

A

Low or high pressure compressor

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3
Q

At which component in an air cycle machine cooling system does air undergo a pressure and temp drop?

A

Expansion turbine

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4
Q

In a freon vapor-cycle cooling system, where is cooling air obtained for the condensor?

A

Ambient air

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5
Q

What is ventilating air used for an combustion heater?

A

Carries heat to the places where it is needed

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6
Q

Turbine engine air used for air conditioning and pressurization is generally called

A

bleed air

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7
Q

In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases?

A

Either a combustion air relief valve or differential pressure regulator

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8
Q

How is the cabin pressure of an aircraft maintained in flight?

A

By controlling the rate of air flowing out the cabin

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9
Q

What control the operation of the cabin pressure regulator?

A

Cabin altitude

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10
Q

The basic air cycle cooling system consists of

A

a source of compressed air, heat exchangers and a turbine

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11
Q

The purpose of the dump valve in a pressurized aircraft is to relieve

A

all positive pressure from the cabin

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12
Q

What component might possibly be damaged if liquid refrigerant is introduced into the low side of a vapour cycle cooling system when the pressure is too high or the outside air temp is too low?

A

Compressor

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13
Q

How can it be determined that a vapor-cycle cooling system is charged with the proper amount of freon?

A

Air bubbles in the sight glass disappear

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14
Q

When charging a vapor cycle cooling system after evacuation, the low-pressure gauge fails to come out of a vacuum. What is indicated?

A

Blockage in the system

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15
Q

What component in a vapour cycle cooling system would most likely be at fault if a system would not take a freon charge?

A

Expansion valve

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16
Q

Frost or ice buildup on a vapour cycle cooling system evaporator would most likely be caused by

A

inadequate airflow through the evaporator

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17
Q

What test is used to determine the serviceability of an oxygen cylinder?

A

Pressure test with water

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18
Q

How often should standard weight high-pressure oxygen cylinders be hydrostatically tested?

A

Every 5 years

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19
Q

To be eligible for recharging, a DOT 3HT oxygen cylinder must have been hydrostatically tested every three years and be retired from service after

A

24 years or 4380 filing cycles

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20
Q

Which type of oxygen system uses the rebreather bag-type mask?

A

Continuous flow

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21
Q

The component that determines the pressure level in the cabin is the cabin air pressure

A

outflow valve

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22
Q

Hot compressor bleed air operates the conditioned air system on some turbine aircraft, cold air supplied by the

A

air cycle air conditioning

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23
Q

For use in pressurized aircraft, which is generally the least complicated and requires the least maintenance?

A

Chemical oxygen generator systems

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24
Q

What is the main cause of contamination of gaseous oxygen systems?

A

Mositure

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25
Q

Where does the last stage of cooling in an air-cycle air conditioning system occur?

A

Expansion turbine

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26
Q

The point at which Freon flowing through a vapour-cycle cooling system gives up heat and changes from a gas to a liquid is the

A

condenser

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27
Q

The point at which Freon flowing through a vapour-cycle cooling system gives up heat and changes from a liquid to a gas is the

A

evaporator

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28
Q

How is the cabin pressure of a pressurized aircraft usually controlled?

A

By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set

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29
Q

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?

A

Supplement physical inspections with periodic operational carbon monoxide detection tests

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30
Q

On some cabin pressurization systems, pressurization on the ground is restricted by the

A

main landing gear operated switch

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31
Q

The cabin pressure control setting has a direct influence upon the

A

outflow valve opening

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32
Q

The function of the evaporator in a freon cooling system is to

A

lower the temp of the cabin air

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33
Q

What is the purpose of a mixing valve in a compressor bleed air, air conditioning system?

A

Control the supply of hot, cool and cold air

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34
Q

What component of a pressurization system prevents the cabin altitude from becoming higher than airplane altitude?

A

Negative pressure relief valve

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35
Q

If the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, the system should

A

be operated for a period of time to reach a stable condition and then the freon level rechecked

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36
Q

If the cabin rate of climb is too high, the control should be adjusted to cause

A

the outflow valve to close faster

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37
Q

The position of the thermostatic expansion valve in a vapor cycle cooling system is determined by temp and pressure of the

A

freon in the outlet of the evaporator

38
Q

The function of the condenser in a freon cooling system is to

A

transfer the heat from the freon gas to ambient air

39
Q

The function of the condenser in a freon cooling system is to

A

transfer heat from the freon gas to ambient air

40
Q

The function of the expansion valve in a freon cooling system is to act as a metering device and to

A

reduce the pressure of the liquid freon

41
Q

Which prevents a sudden loss of pressurization in the event that there is a loss of pressurization source?

A

Delivery air duct check valve

42
Q

When servicing an air conditioning system that has lost all its freon, it is necessary to

A

check oil and add as necessary, evacuate the system and add freon

43
Q

The primary function of the cabin pressurization system outflow valve is to

A

maintain the desired cabin pressure

44
Q

One purpose of a jet pump in a pressurization and air conditioning system is to

A

provide for augmentation of airflow in some areas of the aircraft

45
Q

After cleaning or replacing the filtering element in a combustion heater fuel system, the system should be pressurized and

A

all connections checked for leaks

46
Q

The operation of an aircraft combustion heater is usually controlled by a thermostat circuit which

A

alternately turns the fuel on and off, a process known as cycling

47
Q

The air-cycle cooling system produces cold air by

A

extracting heat energy across an expansion turbine

48
Q

What does a steady stream of bubbles indicate when servicing a vapor cycle air condition system?

A

The system is under charged

49
Q

An aircraft pressurization cycle is normally considered to be

A

one complete series of events or operations that recur regularly

50
Q

Which best describes cabin differential pressure?

A

Difference between the ambient and internal air pressure

51
Q

Composite oxygen bottles that conform to DOT-E-8162 have a service life of

A

15 years or 10,000 filing cycles which ever occur first

52
Q

The cabin pressurization modes of operations are

A

differential, unpressurized and isobaric

53
Q
  1. Usually bleed air from a gas-turbine engine compressor can be safely used for cabin pressurization.
  2. Independent cabin condition air machines (air cycle machine) can be powered by bleed air from an aircraft turbine engine compressor
A

Both No.1 and No. 2 is true

54
Q

A pressurization controller uses

A

Barometric pressure, cabin altitude, and cabin rate of change

55
Q

What unit in a vapour cycle cooling system serves as a reservoir for the refrigerant?

A

Reciever-dryer

56
Q

What is the condition of the refrigerant as it enters the evaporator of a vapour cycle cooling system?

A

Low-pressure liquid

57
Q

What is the condition of the refrigerant as it enters the condensor of a vapour cycle cooling system?

A

High pressure vapor

58
Q

The evacuation of a vapor-cycle cooling system removes any water that may be present by

A

lowering the boiling point of the water and drawing out the vapor

59
Q

What is the condition of the refrigerant as it leaves the evaporator of a vapour cycle cooling system?

A

Low pressure vapor

60
Q

What is the condition of the refrigerant as it enters the condensor of a vapour cycle cooling system?

A

High pressure liquid

61
Q

In what position should the bottle be placed when adding liquid freon to a vapour cycle cooling system?

A

Vertical with the outlet at the bottom

62
Q

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?

A

Prevent excessive loss of refrigerant oil

63
Q

When a vapor cycle cooling system is not in operation, what is an indication that the system is leaking freon?

A

Oil seepage

64
Q

When refrigerant is leaking from a vapor cycle system, what is the preferred method of finding the leak?

A

Electronic leak detection

65
Q

In an operating vapor cycle cooling system, if two lines connected to the expansion valve are essentially the same temp, what does it indicate?

A

The expansion valve is not metering freon properly

66
Q

The purpose of a subcooler in a vapour-cycle cooling system is to

A

cool the freon to prevent premature vaporization

67
Q

A small amount of water in a vapor cycle cooling system can freeze

A

in the expansion valve and stop the system operation

68
Q

No.2 Water in a vapour cycle cooling system will react with refrigerant to form hydrochloric acid which is highly corrosive to the metal in the system

A

No.2 is only true

69
Q

When refrigerant-12 is passed over an open flame, it

A

changes to phosgene gas

70
Q

What type of oil is suitable for use in vapor cycle cooling system?

A

Special high grade refrigerant oil

71
Q

When an aircraft oxygen system has developed a leak, the lines and fittings should be

A

bubble tested with special soap solution manufactured specially for this purpose

72
Q

If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause

A

moisture to collect in the bottle

73
Q

What controls the amount of oxygen delivered to a mask in a continuous flow oxygen system?

A

Calibrated orifice

74
Q

When does the diluter demand regulator operate?

A

When the user inhales

75
Q

The primary difference between aviation breathing oxygen and other types of commercially available compressed oxygen is that

A

aviation breathing oxygen has had all the water vapour removed

76
Q

What is used in some oxygen systems to change high cylinder pressure to low system pressure

A

Pressure reducer valve

77
Q

In a high pressure oxygen system, if the pressure reducer fails, what prevents high-pressure oxygen from entering the system downstream?

A

Pressure relief valves

78
Q

High-pressure cylinders containing oxygen for aviation use can be identified by their

A

green color and the words - ‘AVIATORS BREATHING OXYGEN’ stenciled in 1” white letters

79
Q

An oxygen bottle may be considered airworthy if it has been hydrostatically tested and identified

A

with a test date, DOT number and serial number stamped on the cylinder near the neck

80
Q

In a gaseous oxygen system, which of the following are vented to blow out plugs in the fuselage skin?

A

Pressure relief valves

81
Q

What is the purpose of pressurizing the aircraft cabin?

A

To make human flight possible at hostile environment of the upper atmosphere

82
Q

Oxygen used in aircraft systems

A

is atleast 99.5% pure and is practically water free

83
Q

Oxygen systems in unpressurized aircraft are generally of the

A

continuous flow and pressure demand types

84
Q

The purpose of the airflow metering aneroid found in oxygen diluter demand regulators is to

A

regulate airflow in relation to cabin altitude when in diluter demand position

85
Q

If a high-pressure oxygen cylinder is to be installed in an airplane, it must meet the specifications of the

A

Department of Transport

86
Q

Before a high-pressure oxygen cylinder is serviced, it must be the correct type and have been

A

hydrostatically tested within the proper time interval

87
Q

A contaminated oxygen system is normally purged with

A

oxygen

88
Q

How should you determine the amount of oxygen in a portable, high pressure cylinder?

A

Read the pressure gauge mounted in the cylinder

89
Q

What may be used as a lubricant on oxygen system tapered pipe thread connections

A

Teflon tape

90
Q

On transport category aircraft what might be an indication of an over pressure event of the aircraft oxygen system?

A

The green thermal expansion disk missing

91
Q

Which of the following are characteristics of a chemical or solid state oxygen system?

A

A volume storage capacity about three times that of compressed oxygen and the system generators are inert below 400F even under severe impact

92
Q

An aircraft magnetic compass is swung to up-date the compass correction card when

A

equipment is added that could affect compass deviation

A&P - Airframe (18 decks)

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