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Mod 13 > Air Con 13.11.2 Q’s > Flashcards

Air Con 13.11.2 Q’s Flashcards

1
Q

HEPA filters are used in

A

A cabin air recirculating system

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2
Q

If pressurisation air supplies come from an engine compressor an internal oil leak will

A

Contaminate the air and be hazardous to the passengers and crew

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3
Q

International markings for air conditioning pipelines are

A

Dots

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4
Q

Ozone is removed from cabin charge air

A

At the inlet to the air conditioning system

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5
Q

When carrying out a ground pressure run you should use

A

The aircraft engines because you can test the whole system

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6
Q

HEPA stands for

A

High efficiency particulate arrestor

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7
Q

A cabin humidifier is operated at

A

High altitudes

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8
Q

A combustion heater overheats during flight

A

It will automatically reset but the pilot needs to relight

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9
Q

A high pressure water separator in a ACM consists of what heat exchangers

A

Reheater
Condensor

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10
Q

A skin heat exchanger may be used to cool

A

Electronic equipment

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11
Q

Air conditioning systems

A

Decrease the temperature of the air

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12
Q

An air to air heat exchanger in an air conditioning system is provided to

A

Reduce the air supply temp

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13
Q

An aircraft can is air conditioned and pressurised in order to

A

Maintain human performance and comfort during flights at high altitudes

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14
Q

Where is a low pressure water separator located in a ACM

A

After the turbine

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15
Q

How does a combustion heater vary its temp

A

Switches fuel and ignition on and off as required

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16
Q

In air conditioning system distribution the preferred dictons section for wase of manufacturing and fitting and for strength is

A

Circular

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17
Q

Maintenance tasks to be carried out on the air conditioning can be found in

A

AMM chapter 21

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18
Q

On a combustion heater fitted to a rotorcraft where the heat exchanger or the ventilation air temp exceed safe limits

A

There must be a automatic cut off for ignition and fuel supply at a point remote from the heater

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19
Q

Which of the following sometimes inhibits an air conditioning pack

A

Throttle switches

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20
Q

A variable expansion valve in a vapour cycle cooling system is responsive to

A

The temperature at the evaporator

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21
Q

After passing through the primary heat exchangers the supply air in an air cycle system flows to the

A

Fan

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22
Q

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

A

Receiver dryer

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23
Q

Air exiting the turbine of an air cycle machine

A

Will have decreased pressure and temp

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24
Q

An advantage of using an air cycle system over the vapour cycle system in large aircraft is

A

Both air con and pressurisation are obtained

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25
Q

What is the condition of refrigerant when it enters the condenser of vapour cycle cooling

A

High pressure vapour

26
Q

An air cycle machines turbine

A

Drives a compressor where the temp increases

27
Q

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

A

Inadequate airflow through the evaporator

28
Q

An air cycle pack usually has protection temp sensors

A

At pack out let at the compressor outlet and at the turbine inlet

29
Q

An air cycle system used for air cycle cooling will

A

Decrease pressure and temp of the charge air

30
Q

Before filling a vapour cycle cooling system

A

Apply suction to remove air and moisture

31
Q

Humidifiers are operated at

A

High altitude

32
Q

In a three wheel air cycle machine air circulated from the cabin is directed to the

A

Efflux turbine / mixer unit

33
Q

In a boot strap air conditioning system a low pressure water separator is located

A

Down stream of the turbine

34
Q

In a vapour cycle cooling system water will condense from the air at the

A

Evaporator

35
Q

In pressurised aircraft temperature conditioning is mainly achieved by

A

Extracting heat from the pressurised air

36
Q

In the case of a vapour cycle cooling system heat is removed from the charge air by

A

Changing a liquid into a vapour

37
Q

Name the components of a vapour cycle system in order

A

Compressor condenser expansion valve evaporator

38
Q

One of the principles of cooling employed in an air cycle system is

A

Conversion of heat energy to mechanical energy in the air cycle machine

39
Q

R134a is used in

A

A vapour cycle cooling system

40
Q

Temperature control of cabin air is achieved by

A

Regulating the amount of air bypassing the cooling system

41
Q

The compressor of a vapour cycle cooling system is found to be operating intermittently

A

This is normal

42
Q

The effective temperature of a cabin is given by

A

Temperature and humidity

43
Q

The expansion valve in a vapour cooling system is located

A

Before the evaporator

44
Q

The heat exchanger in a air cycle system is cooled by

A

Ambient ram air

45
Q

The humidity within a passenger cabin should be

A

Be between 30% & 70%

46
Q

The purpose of the expansion valve in a vapour cycle cooling system is to

A

Reduce the pressure of the refrigerant

47
Q

The receiver/dryer in a vapour cycle air cooling system

A

Removed moisture from the refrigerant fluid

48
Q

The temperature at which an air cycle system outputs conditioned air is determined by

A

The selected temperature of the coldest cabin

49
Q

The temperature within the cabin of the aircraft is normally selectable between

A

18-30 degrees centigrade

50
Q

The thermostatic valve sensing bulb is located just before

A

The evaporator

51
Q

When a new cabin temperature is selected temperature overshoot and hunting is protected by

A

An anticipator circuit and damping bridge circuit

52
Q

When a vapour cycle cooling system is topped up with refrigerant the new refrigerant is put into the

A

Low pressure side only

53
Q

When the refrigerant dissipates heat in a vapour cycle system

A

The vapour converts to a liquid

54
Q

Where is the last stage of cooling in an air cycle system

A

Expansion tube or space

55
Q

Which of the following can be used on the ground

A

Turbofan

56
Q

Which refrigerant type is no longer allowed to be use

A

R12

57
Q

Which vapour cycle air conditioning system component must have protection form ice formation

A

The evaporator

58
Q

Which vapour cycle system component is located on the aircraft cabin

A

Evaporator

59
Q

Which vapour cycle system component is required to be most strongly constructed

A

Condenser

60
Q

Which zone normally has the greatest cooling demand

A

The flight deck

Mod 13 (22 decks)

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