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M11 R > M11.11 > Flashcards

M11.11 Flashcards

1
Q

Why are hydraulics used?

A

To activate or move heavy loads

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2
Q

What is the units for force?

A

Newtons

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3
Q

How is pressure calculated?

A

Force
——-
Area

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4
Q

What is the unit for pressure?

A

Pascals

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5
Q

What does one pascal also equal?

A

One newton per square meter

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6
Q

What is hydraulic pressure normally measured in?

A

Bar or psi

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7
Q

What is one bar equal to in psi?

A

14.5 psi

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8
Q

If an aircraft operates at 3,000 psi, what is the amount of pressure in bar?

A

207 bar

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9
Q

What is hydrostatic pressure?

A

Pressure produced by static fluids

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10
Q

What is hydrodynamic pressure?

A

Pressure produced by moving liquids

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11
Q

In a series of pipe work where would the high pressure be?

A

On the outside of the bends

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12
Q

What type of oil is made from natural substances?

A

Mineral oil

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13
Q

What type of oil is man made?

A

Synthetic oil

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14
Q

What colour is mineral oil?

A

Red

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15
Q

What type of oil can be mixed together?

A

Mineral oil

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16
Q

What colour is synthetic oil?

A

Violet

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17
Q

What type of oil cant you mix?

A

Synthetic oil

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18
Q

What does hygroscopic mean?

A

If a fluid has the tendency to absorb water

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19
Q

What type of oil is harmful to humans?

A

Synthetic oil

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20
Q

What is another word for a seal?

A

Packing

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21
Q

What happens if a seal comes in contact with the wrong hydraulic oil?

A

It will tend to increase in size

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22
Q

What are seals normally made from?

A

Rubber or Teflon

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23
Q

Where are static seals used?

A

Steady or pulsating pressure occurs

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24
Q

Where are dynamic seals used?

A

Where stroking or rotational movement occur

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25
Q

What are baffle plates used for?

A

To ensure there is a positive fluid supply to the system

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26
Q

Where is the drain plugs located on a reservoir?

A

At the lowest point

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27
Q

Why is the reservoir pressurised?

A

To keep a positive supply and to prevent foaming, evaporation, and cavitation

28
Q

What are the two methods for pressurising the reservoir?

A

Hydraulic pressure or air pressure

29
Q

What must you do when you want to work on the reservoir?

A

Depressurise the system

30
Q

Where is the depressurisation valve located?

A

At the ground service panel

31
Q

What is an accumulator?

A

A device with stored potential energy to exert a force

32
Q

What is hydro-pneumatic accumulators a combination of?

A

Hydraulic fluid and gas

33
Q

What are hydraulic reservoirs pressurised to?

A

50psi

34
Q

What is meant by pre-charging?

A

When a boost pump increase fluid pressure as it enters the pump

35
Q

What time of pump is most commonly used?

A

Engine-driven pump

36
Q

What type of pump is a engine-driven pump?

A

A variable displacement pump

37
Q

In an event of a fire, What is installed in the engine driven pump?

A

Fire shut off valve to stop flow of hydraulic fluid

38
Q

What colour system is the electric pump used on?

A

Blue

39
Q

When do electric pumps start automatically?

A

When the engines start

40
Q

What type of pump is the electric pump?

A

A variable displacement pump

41
Q

How are electric pumps cooled?

A

By air or hydraulic fluid

42
Q

How are the air driven pumps activated?

A

When the engine driven pump can’t maintain pressure or by flight crew

43
Q

What type of pump is a air driven pump?

A

A variable displacement pump

44
Q

How is the RAT deployed?

A

By the flight crew

45
Q

What type of pump is inside of the RAT?

A

Variable displacement pump

46
Q

How long does the RAT take to deploy?

A

Less than a second

47
Q

What are filters used for?

A

Used to remove FOD from air or fluid systems

48
Q

What can filters be made from?

A
  • metal
  • plastic
  • paper
49
Q

When would the filter bypass open?

A

When the filter is clogged and caused a pressure increase

50
Q

What is the mechanical visitation that a filter is clogged?

A

A red button pops out

51
Q

What is meant by high pressure distribution?

A

The process for moving pressurised fluid from pumps to users

52
Q

What is the job of a check valve?

A

Checks that flow is in the correct direction and prevents back flow

53
Q

What does the priority valve do?

A

It priorities the more important systems if there is a large demand

54
Q

What does the low pressure distribution do?

A

It combines all of the return lines back to the reservoir

55
Q

What must there be to operate the hydraulic pumps?

A

Fuel otherwise there wouldn’t be any coolant

56
Q

What is swaging?

A

A repair sleeve on a pipe that can’t be removed

57
Q

What are the different classification of hoses?

A

Low, medium, high

58
Q

What’s the inside of a hose made from?

A

Teflon

59
Q

Wha is the protective cover on hose made from?

A

Steel wire

60
Q

Hose fittings are always?

A

Disconnectable

61
Q

Where does pressurised filling of the hydraulic system take place?

A

The service panel

62
Q

Where is a sampling valve located?

A

On the HP manifold

63
Q

What is the hydraulic fluid sampled for?

A

Water contamination and fluid performance

64
Q

What would a low air pressure fault in the reservoir lead to?

A

Cavitation

65
Q

How is the engine driven pump output regulated?

A

By the wobble plate

66
Q

What must you do to hydraulic system if it starts to overheat?

A

Completely shut it down

M11 R (21 decks)

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