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(Airframes)Hydraulics & Pneumatics(Airframes) > Practice Exam > Flashcards

Practice Exam Flashcards

1
Q

Which of the following materials is compatible with skydrol?

A

Butyl Rubber

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2
Q

What color is 5606?

A

red

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3
Q

What is viscosity?

A

Internal resistance to flow

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4
Q

Three ways of pressurising a reservoir?

A

Aspirator
Hydraulic Pressure
Bleed Air

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5
Q

To prevent surging and vortexing?

A

Bafels and fins

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6
Q

Hydraulic pump creates?

A

Flow

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7
Q

If the hydraulic filter becomes clogged the system will?

A

Receive fluid though the bypass

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8
Q

Three types of accumulator?

A

Diyafram
Bladder
Piston

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9
Q

What is most likely to happen if you get hydraulic fluid out of the nitrogen fitting of an accumulator?

A

Ruptured Diyafram

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10
Q

Sequence valves are normally?

A

Mechanically Operated

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11
Q

What component in a hydraulic system changes pressure into force?

A

The Actuator

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12
Q

What is a sealing element that is subject to motion called?

A

Packing

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13
Q

What is the main purpose of a pressurized reservoir in a hydraulic system?

A

Prevent Hydraulic Cavitation

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14
Q

Hydraulic system thermal relief valves are open at?

A

Higher pressure than the system relief valve

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15
Q

What is an example of an open hydraulic system?

A

Hoover Dam

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16
Q

Hydraulic fluid reservoirs are sometimes design with the standpipe in one of the outlet ports in order to assure emergency supply of fluid the outlet port standpipe replenishes fluid to the?

A

Normal System Pump

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17
Q

Hydraulic system that is referred to as a power pack has?

A

All System components integrated into one unit

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18
Q

Component in the hydraulic system that is used to direct the flow of fluid is the?

A

Selector Valve

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19
Q

Dampening units are used in aircraft systems that are hydraulic powered to?

A

Control the speed of the relative movement between two connected objects

20
Q

Heat exchanger cooling are required in some areas of the aircraft because?

A

High pressure, high rates of fluid flow generate high heat

21
Q

Which seals are used with mineral based hydraulic fluid?

A

Buna-N

22
Q

Extrusion of an O-ring seal is prevented in a high pressure system by the use of?

A

Backup ring on the side of the O-ring away from the pressure

23
Q

Disconnect couplings on a system provide means of?

A

Quickly connect and disconnect hydraulic line without loss of fluid or contamination

24
Q

Hydraulic system accumulators serve which of following?

A

1,2,3

25
Q

What is the purpose of using backup rings with o rings on systems over 1500 psi?

A

Prevents extruding between moving part and stationary part

26
Q

Relief Valves are used in pneumatic systems?

A

As damage preventing units

27
Q

And then some hydraulic systems incorporated a device that is designed to remain open to allow a normal fluid flow align but closes in the fluid flow increases above established rate this device is generally referred to as?

A

Hydraulic Fuse

28
Q

Distinctive characteristics of an open centered selector valve is that?

A

fluid flows in three directions through the valve in the off position

29
Q

Integral reservoir with most likely be found on?

A

Light aircraft general aviation operation

30
Q

If the hydraulic brake system uses Buna-N packing material it is going to be?

A

Mineral based

31
Q

A double acting balance actuator?

A

2 fluid ports and 1 rod on each side of single piston

32
Q

The air that is expended that is expended?

A

Exhausted or dumped usually overboard

33
Q

The first step in removing the accumulator in an aircraft is to?

A

Relieve system pressure

34
Q

The purpose of pressure regulator in hydraulic system is to?

A

Maintain systems operating pressure

35
Q

The unit which causes one hydraulic operation to follow another in a certain order is a?

A

sequence valve

36
Q

A fully charged hydraulic accumulator provides?

A

Additional hydraulic power

37
Q

What is the ATA code for pneumatics?

A

ATA 36

38
Q

A hydraulic component that automatically directs fluid from either the normal source or the emergency source in an actuating cylinder is?

A

Shuttle Valve

39
Q

The air that is expended when no longer needed?

A

Exhausted and dumped overboard

40
Q

Chevron and U ring seals are two examples of?

A

One way seals

41
Q

A hydraulic motor converts?

A

Linear motion to rotary motion

42
Q

Hydraulic filter is clogged when?

A

DPI button pops up

43
Q

When hydraulic fluid is pumped into a preload system the pressure will?

A

Remain the same

44
Q

Which hydraulic fluid is blue?

A

Vegetable fluid

45
Q

To check the precharge in a hydraulic accumulator?

A

Reduce all pressure then observe the reading on hydraulic gage

(Airframes)Hydraulics & Pneumatics(Airframes) (12 decks)

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