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module 11b > 11.4.2 - Air Con - 4q > Flashcards

11.4.2 - Air Con - 4q Flashcards

1
Q

The Loss of trim air valve control will cause what?

A
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2
Q

What uses refrigerant?

A
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3
Q

Conversion of energy from what form to what form occurs in the turbine section of the ACM?

A

.

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4
Q

What happens pressure in the turbine section of the ACM?

A
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5
Q

The ACM machine does what to the pneumatic air supply?

A
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6
Q

What does the Mass flow controller do?

A
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7
Q

How does the ACM produce a temp drop?

A
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8
Q

Cabin blower/Supercharger provides what?

A
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9
Q

Where is the Water separator located?

A

Water separator is downstream of the turbine

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10
Q

What is ‘Gasper Air’?

A
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11
Q

What is the ACM also known as?

A
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12
Q

The Mixing chamber has _________________

A
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13
Q

Where does the Air go after the ACM?

A

Air leaves the ACM and goes to the mix chamber

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14
Q

How is the cabin humidity increased?

A
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15
Q

ACM secondary heat exchangers are located where?

A

ACM secondary heat exchangers are between the ACM compressor and turbine

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16
Q

What does Ram Air supply need added to it?

A
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17
Q

Heat for cabin is obtained using what process?

A
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18
Q

Where is the Water Extractor located?

A

Water extractor = After the ACM

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19
Q

What does the Thermal Expansion Valve do?

A
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20
Q

Cooling for the Vapour cycle compressor/pump is done by?

A
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21
Q

What is the likely problem if the Vapour cycle system wont take a charge?

A
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22
Q

Bubbles in the sight glass indicate what? (Reciever Dryer - Vapour Cycle System)

A

Bubbles in the sight glass, needs more fluid

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23
Q

Max velocity of air from the cabin ventilation system is what?

A
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24
Q

Air Con systems does what to air temp?

A
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25
Q

Where is the Water Trap located in a bootstrap compressor?

A
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26
Q

Where is the Silencer located?

A

Silencer located at the outlet of the blower

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27
Q

What is the % of fresh air vs recirculated?

A
28
Q

What effect does the Air to Air heat exchanger have on air supply temp.?

A
29
Q

What is the Minimum humidity value? (%)

A
30
Q

Cabin air temp range is what?

A
31
Q

Punkah Louvre is another name for what and min flow rate is what?

A
32
Q

Vapour into a liquid does what in terms of heat?

A
33
Q

What is Effective Temp?

A
34
Q

Air con pipes contain what symbol marking?

A
35
Q

How is heat added to the air?

A
36
Q
A

Check the indicator with air passing through the water separator

37
Q
A

ACM over speed

38
Q
A

Loss of Temp control for that zone

39
Q
A

Vapour cycle cooling

40
Q
A

The turbine section of the Air cycle machine

41
Q
A

The turbine section of an air cycle machine

42
Q
A

To cool the bleed air at the heat exchangers

43
Q
A

Ensure that a constant Volume of air is delivered at all times

44
Q
A

Expanding hot air across a turbine, which drives a compressor

45
Q

A cabin supercharger or ‘Blower’ is a device which:
1/ Removes stale air from the cabin galley
2/ Keeps electronic or galley equipment cool
3/ Provides compressed air for cabin pressurisation purposes

A

3/ Provides compressed air for cabin pressurisation purposes

46
Q
A

Air drawn from the compressor section of an engine

47
Q
A

Adding heat to the pressurized air

48
Q
A

Downstream of the turbine

49
Q
A

a mixture of hot and cold air

50
Q
A

expanding hot air across a turbine that is driving a compressor

51
Q

To ensure the correct mixing of the cabin conditioned air, the mixing chamber has:
1/ jet pumps
2/ cooler
3/ swirl devices

A

3/ swirl devices

52
Q
A

cabin/mix chamber

53
Q
A

Between the ACM compressor and the turbine

54
Q
A

Ram air supply

55
Q

Heating for turbo-jet aircraft with pressure cabins is obtained by using:
1/ the pressurising process
2/ electrical heating
3/ the engine exhaust

A

1/ the pressurising process

56
Q

The water extractor is normally located:
1/ before the cold air unit (ACM)
2/ after the cold air unit
3/ after the turbine before the compressor

A

2/ after the cold air unit

57
Q

Vapour cycle cooling, what is at fault if it will not take a Freon charge:
1/ expansion valve
2/ condenser
3/ receiver-dryer

A

1/ expansion valve

58
Q
A

pressure for the evaporator is too low

59
Q
A

control refrigerant to evaporator

60
Q

What cools the compressor/pump of the Vapour Cycle cooling system:
1/ the refrigerant
2/ the ram air
3/ special oil

A

3/ Special oil (highly refined mineral oil)

61
Q
A

Expansion valve

62
Q
A

compressor to heat the air going through it (the compressor)

63
Q
A

high altitudes

64
Q
A

Heat exchanger

65
Q

What is the most important part that the vacuum pump plays in servicing a vapour cycle system:
1/ it ensures that all of the refrigerant is absent from the system before recharge
2/ it ensures that all the water vapour is removed from the system before recharge
3/ it ensures that all the air is free from the system before recharge

A

2/ it ensures that all the water vapour is removed from the system before recharge

66
Q

When checking the receiver dryer for quantity of refrigerant, you see bubbles through the site glass, this is an indication of:
1/ that the system needs more fluid
2/ that the system is running correctly
3/ that the system is running too cold

A

1/ that the system needs more fluid

67
Q
  1. A common method of increasing cabin humidity is:
    1/ Injecting water across the heat exchangers
    2/ using an atomising spray just prior to the conditioned air entering the cabin
    3/ decreasing the use of the air cycle machine
A

2/ using an atomising spray just prior to the conditioned air entering the cabin

module 11b (42 decks)

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