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Aircraft General Knowledge > Hydraulic Principles > Flashcards

Hydraulic Principles Flashcards

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1
Q

How is pressure generated in a hydraulic system?

A

Resistance to flow.

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2
Q

True or false: oil is incompressible?

A

True.

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3
Q

A passive hydraulic system is a system that requires human power to raise blank.

A

A system that requires human power to raise tempurature.

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4
Q

How many pumps does an active hydraulic system have?

A

One or more.

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5
Q

What type of centred system uses pressure only when demanded?

A

Open centred.

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6
Q

What type of oil container - should you replenish an aircraft with?

A

Unopened.

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7
Q

What viscosity do we want hydraulic fluid to have?

A

Low viscosity.

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8
Q

What colour is mineral hydraulic fluid?

A

Red.

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9
Q

If there is a purple puddle under . Your aircraft what is it?

A

Hydraulic fluid.

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10
Q

What is a bonus of hydraulic systems in regards to energy?

A

Very little energy lost in the processes.

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11
Q

Is hydraulic fluid corrosive?

A

Yes, very.

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12
Q

What is the range of hydraulic pressure in modern aircraft?

A

3000 → 4000 psi.

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13
Q

What should you do to the power transfer value if there is a lease in one of the hydraulic systems.

A

Close it.

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14
Q

What type of valve uses a ball and spring? (NV valve)

A

Non return valve

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15
Q

During the aircraft walk around what level would you expect to see the hydraulic resouvior at??

A

Almost full

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16
Q

Why is the hydraulic resouiour under high pressure?

A

To reduce evaporation.

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17
Q

What property does nitrogen gas have that means it is used in a hydraulic accumulator?

A

It is inert.

18
Q

When are accumulators used for hydraulic pressure? To do with the pumps.

A

If the pump fails.

19
Q

What type of delivery pump goes hand in hand with the automatic cut out value?

A

Constant delivery pump

20
Q

True or false : In constant pressure pumps, the pump output is dependant on speed.

A

False.

21
Q

On start up of an engine, the pump swash playe is at what degree?

A

Zero.

22
Q

How many microns is the size of debris a hydraulic filter can stop?

A

5 microns.

23
Q

What valve allows for the most appropriate supply to be used in hydraulics?

A

Shuttle valve.

24
Q

Hydraulic fuses close when there is a pressure blank.

A

When there is a pressure differential?

25
Q

What does the blue system control on an airbus?

A

Flight controls.

26
Q

Which colour reservoir has a stack pipe in an airbus?

A

Yellow.

27
Q

What is a ram air turbine?

A

Emergency generator.

28
Q

High pressure blank air powers a turbine which powers a hydraulic pump (this is used on older aircraft)

A

Bleed.

29
Q

What is the pressure differential when the PTU activated in the 320?

A

500psi.

30
Q

A hydraulic accumulator serves to blank the hydraulic pressure fluctuations and act as a blank resorviour.

A

Dampen - backup.

31
Q

During a normal aircraft service, an engineer notices an oily mist leaving the pressure release valve whilst draining the nitrogen from a horizontally mounted hydraulic accumulator. What does this indicate?

A

Theres a leak.

32
Q

A possible pneumatic source in a single engine piston aircraft is…

A

Compressor

33
Q

A FADEC piston engine has two _____ to achieve redundancy.

A

Power supplies

34
Q

An aircraft is equipped with two individual hydraulic systems. One of the systems has a pump failure. How will the system alert the pilot?

A

A master caution and an amber light.

35
Q

To prevent vapour locking, which can lead to fuel starvation, a common type of limitation imposed by the Minimum Equipment List (MEL) in large transport aeroplanes for complete boost pump failure is…

A

Max limiting altitude.

36
Q

Which one of the following liquids are considered highly corrosive?

(1) Anti-icing fluid
(2) De-icing fluid
(3) Window washer
(4) Hydraulic fluid
(5) Engine oil
(6) Jet fuel

A

4

37
Q

What is the component that converts hydraulic pressure into linear motion? (Pressure regulator / jack / hydraulic pump / accumulator)

A

Jack

38
Q

What is cavitation?

A

Air bubbles

39
Q

A constant delivery hydraulic pump provides (1) _____ and (2) _____.

(Constant/varying pressure - constant/varying volume)

A

Varying P - constant V

40
Q

The hydraulic device, which functionality is comparable to a diode in an electrical circuit, is a… blank valve

A

Check

41
Q

What becomes damaged if a mineral based hydraulic oil is used in in a system designed for synthetic hydraulic oil?

A

Seal

Aircraft General Knowledge (42 decks)

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