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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
What type of seals are used with MIL-H-8446
BUTYL RUBBER / ETHYLENE PROPLENE / TEFLON
26
What is used to flush MIL-H-8446
SKYDROL PHOSPHATE ESTER MIL-H-8446
27
What are the advantages of MIL-H-8446
NON-FLAMMABLE AND WIDE TEMP RANGE
28
What are the disadvantages of MIL-H-8446
Human Tissue Hazard Sensitive to Water Contamination Destructive to some paint coatings, electrical wiring and tires
29
When adjusting pressure settings you go from ____ to ____
Highest ( thermal relief valve ) —-pressure relieve valve —— lowest (pressure regulator)
30
To figure out precharge in a liquid locked system
Run a hydraulic component to test At the point where pressure drops quickly that is the precharge
31
Variable displacement pump will pump ____ or ____ ____ of fluid depending on how much system needs
More or less volume of fluid
32
Fluid can be a ___ , can also be a ____.
Gas or liquid
33
Micronic filter has what kind of paper?
Specially treated cellulose micron paper
34
How much fluid is discharged from pump discharge depends on the movement of the ___ (internal pressure regulator)
Sleeves
35
In a displacement pump: When pressure is high the …
Spring is compressed moves sleeves to the right relief holes are uncovered no fluid moves out
36
In a displacement pump: When pressure is low the …
Spring moves spider Sleeves to the left Relief holes are covered Fluid is moved out
37
In a closed system the actuating cylinder converts hydraulic pressure into
Linear motion
38
2 actuating cylinders with the same source of hyd fluid, same cross section, same source of pressure but have DIFFERENT lengths in stroke will:
Will move at the same rate of speed Will have the same amount of force F X A = P
39
Relief valves - damage preventing units on both____ systems and ____ systems
Hydraulic and pneumatic
40
When trying to pump a single acting hand pump, there is a liquid lock- this means it could be a possible defect from:
Possible defect from repair station of inverting ball + spring inside pump
41
A flap overload valve avoids _____
A flap overload valve prevents flaps from being lowered at too high airspeed Excessive structural load
42
Low accumulator preload means what will happen?
Will cause the electric hydraulic pump to cycle too often
43
What is used for o ring extrustion
Back up rings are installed on downstream side of O-ring to prevent extrusion
44
When installing o-rings over raised / sharp edges
Use a suitable sleeve ( paper, metallic,smooth)
45
Teflon hose permanent set maintains it shape, what if its bent?
Do not straighten or bend any further - replace
46
In a hydraulic system ( closed system ) a selector valve
Directs pressurized fluid to one end of your actuating cylinder while simultaneously directing return fluid from the other end back to the reservoir
47
In a constant displacement pump (gear type pump) it has
Has 2 gears that rotate and trap fluid Delivers uniform rate of fluid flow How much Fluid flow depends on pump RPM
48
( in a liquid system ) if liquid pressure is dropping it means its losing air pressure most likely through
A leaky air valve
49
When changing filter elements you must:
Relieve all system pressure Depressurize (both liquid / gas systems)
50
( in a gas system / pneumatic ) a pressure relief valve will relieve pressure when the ______ _____ is damaged
Pressure regulator
51
(In a liquid system) the ____ ____ allows fluid to flow in one direction and stops fluid in the opposite direction
Check valve
52
In a pneumatic system, air that is expended has _____ _____
NO return
53
If air gets into the liquid hydraulic system you should:
Operate the various hydraulic components through several cycles to expend air out of the system
54
First step to remove accumulator is to:
Relieve all system pressure
55
In a (off) neutral open center system, fluid flows through the selector valve in the ___ position
Off
56
Restrictors do what ?
Control the rate of movement of hydraulic components
57
What must be done before adjusting the pressure relief valve?
Eliminate the action of the pump unloading valve
58
A shuttle valve directs fluid from ___
The normal source to emergency source
59
All fluids readily transmit ___
Pressure
60
What expands when it is heated and contracts when it is cooled?
Fluids
61
What would be the cause of a pump that chatters?
Air entering the system ( chatter air )
62
Which hydraulic fluid type is most common on aircraft?
Mineral
63
If a system using MIL-H-5606 is contaminated, what would you flush the system with?
Naphtha or Varsol
64
SKYDROL fluid is NOT compatible with nylon and natural fibers and is most common with aircraft metals and paints?
FALSE
65
What should be done before removing a filler cap?
Relieve air pressure
66
What can be used in both a hydraulic system and pneumatic system?
A check valve
67
If a hydraulic line is too short for the flare to reach its seat, tightening/pulling into place, you will ___
Distort the flare
68
Shuttle valves do what?
Automatically directs pressure from the normal source of pressure or the emergency source to an actuating cylinder
69
What is used for normal operation to assure fluid is available for emergency pump?
Stand pipe
70
What safety device is located between drive unit and pump?
A coupling shear section
71
Where would power packs system have all hydraulic power components located?
In one unit
72
TRUE OR FALSE : Pneumatic systems utilize relief valves
True
73
TRUE OR FALSE: Fluids readily transmit pressure
True
74
TRUE OR FALSE: Constant displacement pumps do NOT deliver a uniform rate of fluid flow?
FALSE
75
Hydraulic systems that cycle more frequent may have ____
Low accumulator air preload
76
What prevents pump cavitation?
Pressurized reservoirs
77
(According to the faa) what is the most common selector valve?
4 port closed center selector valve
78
Relief valves are also known as___
Damage preventing units

Hydraulics (1 decks)

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