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Hydraulics > Hydraulics And Pneumatics > Flashcards

Hydraulics And Pneumatics Flashcards

1
Q

Vegetable type hydraulic fluid?

A

MIL-H-7644

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2
Q

What is the chemical base for MIL-H-7644

A

Castor Oil & alcohol

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3
Q

What color is MIL-H-7644 (vegetable)

A

Blue Green

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4
Q

In regards to MIL-H-7644, what kind of seals are used?

A

Natural Rubber

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5
Q

In regards to MIL-H-7644, what is the flush?

A

Castor oil & alcohol

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6
Q

In regards to MIL-H-7644, any advantages?

A

NONE

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7
Q

In regards to MIL-H-7644, what are the disadvantages?

A

CONTAMINATION

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8
Q

What natural type of hydraulic fluid is MIL-H-5606

A

MIL-H-5606 is MINERAL type

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9
Q

In regards to MIL-H-5606 (natural), what is the chemical base?

A

Petroleum ( kerosene )

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10
Q

In regards to MIL-H-5606, (natural/mineral), what color is it identified by?

A

RED

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11
Q

In regards to MIL-H-5606, (mineral/natural) what kind of seals are used?

A

SYNTHETIC RUBBER NITRILE FLUROSILICONS

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12
Q

In regard to MIL-H-5606, what is the flush?

A

MIL-H-5606

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13
Q

In regards to MIL-H-5606, what is the advantage?

A

Stable

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14
Q

In regards to MIL-H-5606, what are the disadvantages?

A

FLAMMABLE
DAMAGES TIRES

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15
Q

2 examples of synthetic/POLYALPHAOLEFINS type of hydraulic fluid

A

MIL-H-83282
MIL-H-81019

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16
Q

In regards to MIL-H-83282/MIL-H-81019, what is the chemical base?

A

HYDROCARBON SYNTHETIC

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17
Q

In regards to MIL-H-83282/MIL-H-81019, what color is it?

A

RED

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18
Q

In regards to MIL-H-83282/MIL-H-81019, what kind of seals are used?

A

NITRILE

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19
Q

In regards to MIL-H-83282/MIL-H-81019, what is the flush?

A

MIL-H-83282 / MIL-H-81019

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20
Q

In regards to MIL-H-83282/MIL-H-81019 what is an advantage?

A

FIRE RESISTANT

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21
Q

In regards to MIL-H-83282/MIL-H-81019, what are disadvantages

A

FLAMMABLE
DAMAGES TIRES
Mil-h-83282) HIGH VISCOSITY AT LOW TEMPERATURE LIMITED TO -40 FARENHEIT

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22
Q

What type of hydraulic fluid is MIL-H-8446/SKYDROL 500 A&B

A

Phosphate ester (synthetic)

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23
Q

What is the chemical base for MIL-H-8446 / SKYDROL 500 A&B

A

PHOSPHATE ESTER SYNTHETIC

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24
Q

What color identifies MIL-H-8446

A

PURPLE ( yellow with age )

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25
Q

What type of seals are used with MIL-H-8446

A

BUTYL RUBBER / ETHYLENE PROPLENE / TEFLON

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26
Q

What is used to flush MIL-H-8446

A

SKYDROL
PHOSPHATE ESTER
MIL-H-8446

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27
Q

What are the advantages of MIL-H-8446

A

NON-FLAMMABLE AND WIDE TEMP RANGE

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28
Q

What are the disadvantages of MIL-H-8446

A

Human Tissue Hazard
Sensitive to Water Contamination
Destructive to some paint coatings, electrical wiring and tires

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29
Q

When adjusting pressure settings you go from ____ to ____

A

Highest ( thermal relief valve ) —-pressure relieve valve —— lowest (pressure regulator)

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30
Q

To figure out precharge in a liquid locked system

A

Run a hydraulic component to test
At the point where pressure drops quickly that is the precharge

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31
Q

Variable displacement pump will pump ____ or ____ ____ of fluid depending on how much system needs

A

More or less volume of fluid

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32
Q

Fluid can be a ___ , can also be a ____.

A

Gas or liquid

33
Q

Micronic filter has what kind of paper?

A

Specially treated cellulose micron paper

34
Q

How much fluid is discharged from pump discharge depends on the movement of the ___ (internal pressure regulator)

A

Sleeves

35
Q

In a displacement pump:
When pressure is high the …

A

Spring is compressed
moves sleeves to the right
relief holes are uncovered
no fluid moves out

36
Q

In a displacement pump:
When pressure is low the …

A

Spring moves spider
Sleeves to the left
Relief holes are covered
Fluid is moved out

37
Q

In a closed system the actuating cylinder converts hydraulic pressure into

A

Linear motion

38
Q

2 actuating cylinders with the same source of hyd fluid, same cross section, same source of pressure but have DIFFERENT lengths in stroke will:

A

Will move at the same rate of speed
Will have the same amount of force
F X A = P

39
Q

Relief valves - damage preventing units on both____ systems and ____ systems

A

Hydraulic and pneumatic

40
Q

When trying to pump a single acting hand pump, there is a liquid lock- this means it could be a possible defect from:

A

Possible defect from repair station of inverting ball + spring inside pump

41
Q

A flap overload valve avoids _____

A

A flap overload valve prevents flaps from being lowered at too high airspeed
Excessive structural load

42
Q

Low accumulator preload means what will happen?

A

Will cause the electric hydraulic pump to cycle too often

43
Q

What is used for o ring extrustion

A

Back up rings are installed on downstream side of O-ring to prevent extrusion

44
Q

When installing o-rings over raised / sharp edges

A

Use a suitable sleeve ( paper, metallic,smooth)

45
Q

Teflon hose permanent set maintains it shape, what if its bent?

A

Do not straighten or bend any further - replace

46
Q

In a hydraulic system ( closed system ) a selector valve

A

Directs pressurized fluid to one end of your actuating cylinder while simultaneously directing return fluid from the other end back to the reservoir

47
Q

In a constant displacement pump (gear type pump) it has

A

Has 2 gears that rotate and trap fluid
Delivers uniform rate of fluid flow
How much Fluid flow depends on pump RPM

48
Q

( in a liquid system ) if liquid pressure is dropping it means its losing air pressure most likely through

A

A leaky air valve

49
Q

When changing filter elements you must:

A

Relieve all system pressure
Depressurize (both liquid / gas systems)

50
Q

( in a gas system / pneumatic ) a pressure relief valve will relieve pressure when the ______ _____ is damaged

A

Pressure regulator

51
Q

(In a liquid system) the ____ ____ allows fluid to flow in one direction and stops fluid in the opposite direction

A

Check valve

52
Q

In a pneumatic system, air that is expended has _____ _____

A

NO return

53
Q

If air gets into the liquid hydraulic system you should:

A

Operate the various hydraulic components through several cycles to expend air out of the system

54
Q

First step to remove accumulator is to:

A

Relieve all system pressure

55
Q

In a (off) neutral open center system, fluid flows through the selector valve in the ___ position

A

Off

56
Q

Restrictors do what ?

A

Control the rate of movement of hydraulic components

57
Q

What must be done before adjusting the pressure relief valve?

A

Eliminate the action of the pump unloading valve

58
Q

A shuttle valve directs fluid from ___

A

The normal source to emergency source

59
Q

All fluids readily transmit ___

A

Pressure

60
Q

What expands when it is heated and contracts when it is cooled?

A

Fluids

61
Q

What would be the cause of a pump that chatters?

A

Air entering the system ( chatter air )

62
Q

Which hydraulic fluid type is most common on aircraft?

A

Mineral

63
Q

If a system using MIL-H-5606 is contaminated, what would you flush the system with?

A

Naphtha or Varsol

64
Q

SKYDROL fluid is NOT compatible with nylon and natural fibers and is most common with aircraft metals and paints?

A

FALSE

65
Q

What should be done before removing a filler cap?

A

Relieve air pressure

66
Q

What can be used in both a hydraulic system and pneumatic system?

A

A check valve

67
Q

If a hydraulic line is too short for the flare to reach its seat, tightening/pulling into place, you will ___

A

Distort the flare

68
Q

Shuttle valves do what?

A

Automatically directs pressure from the normal source of pressure or the emergency source to an actuating cylinder

69
Q

What is used for normal operation to assure fluid is available for emergency pump?

A

Stand pipe

70
Q

What safety device is located between drive unit and pump?

A

A coupling shear section

71
Q

Where would power packs system have all hydraulic power components located?

A

In one unit

72
Q

TRUE OR FALSE :
Pneumatic systems utilize relief valves

A

True

73
Q

TRUE OR FALSE: Fluids readily transmit pressure

A

True

74
Q

TRUE OR FALSE: Constant displacement pumps do NOT deliver a uniform rate of fluid flow?

A

FALSE

75
Q

Hydraulic systems that cycle more frequent may have ____

A

Low accumulator air preload

76
Q

What prevents pump cavitation?

A

Pressurized reservoirs

77
Q

(According to the faa) what is the most common selector valve?

A

4 port closed center selector valve

78
Q

Relief valves are also known as___

A

Damage preventing units

Hydraulics (1 decks)

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