Practice Exam Flashcards
Which of the following materials is compatible with skydrol?
Butyl Rubber
What color is 5606?
red
What is viscosity?
Internal resistance to flow
Three ways of pressurising a reservoir?
Aspirator
Hydraulic Pressure
Bleed Air
To prevent surging and vortexing?
Bafels and fins
Hydraulic pump creates?
Flow
If the hydraulic filter becomes clogged the system will?
Receive fluid though the bypass
Three types of accumulator?
Diyafram
Bladder
Piston
What is most likely to happen if you get hydraulic fluid out of the nitrogen fitting of an accumulator?
Ruptured Diyafram
Sequence valves are normally?
Mechanically Operated
What component in a hydraulic system changes pressure into force?
The Actuator
What is a sealing element that is subject to motion called?
Packing
What is the main purpose of a pressurized reservoir in a hydraulic system?
Prevent Hydraulic Cavitation
Hydraulic system thermal relief valves are open at?
Higher pressure than the system relief valve
What is an example of an open hydraulic system?
Hoover Dam
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?
Normal System Pump
Hydraulic system that is referred to as a power pack has?
All System components integrated into one unit
Component in the hydraulic system that is used to direct the flow of fluid is the?
Selector Valve
Dampening units are used in aircraft systems that are hydraulic powered to?
Control the speed of the relative movement between two connected objects
Heat exchanger cooling are required in some areas of the aircraft because?
High pressure, high rates of fluid flow generate high heat
Which seals are used with mineral based hydraulic fluid?
Buna-N
Extrusion of an O-ring seal is prevented in a high pressure system by the use of?
Backup ring on the side of the O-ring away from the pressure
Disconnect couplings on a system provide means of?
Quickly connect and disconnect hydraulic line without loss of fluid or contamination
Hydraulic system accumulators serve which of following?
1,2,3
What is the purpose of using backup rings with o rings on systems over 1500 psi?
Prevents extruding between moving part and stationary part
Relief Valves are used in pneumatic systems?
As damage preventing units
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?
Hydraulic Fuse
Distinctive characteristics of an open centered selector valve is that?
fluid flows in three directions through the valve in the off position
Integral reservoir with most likely be found on?
Light aircraft general aviation operation
If the hydraulic brake system uses Buna-N packing material it is going to be?
Mineral based
A double acting balance actuator?
2 fluid ports and 1 rod on each side of single piston
The air that is expended that is expended?
Exhausted or dumped usually overboard
The first step in removing the accumulator in an aircraft is to?
Relieve system pressure
The purpose of pressure regulator in hydraulic system is to?
Maintain systems operating pressure
The unit which causes one hydraulic operation to follow another in a certain order is a?
sequence valve
A fully charged hydraulic accumulator provides?
Additional hydraulic power
What is the ATA code for pneumatics?
ATA 36
A hydraulic component that automatically directs fluid from either the normal source or the emergency source in an actuating cylinder is?
Shuttle Valve
The air that is expended when no longer needed?
Exhausted and dumped overboard
Chevron and U ring seals are two examples of?
One way seals
A hydraulic motor converts?
Linear motion to rotary motion
Hydraulic filter is clogged when?
DPI button pops up
When hydraulic fluid is pumped into a preload system the pressure will?
Remain the same
Which hydraulic fluid is blue?
Vegetable fluid
To check the precharge in a hydraulic accumulator?
Reduce all pressure then observe the reading on hydraulic gage
