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AVMT 2206
Fluid Power and Landing Gear
| Question | Answer |
|---|---|
| the most commonly used type of seal is the | O-ring |
| which valve allows free fluid flow in one direction and none in the other? | check valve |
| valve that directs pressurized fluid to one end of an actuating cylinder; also directs return fluid to the reservoir | open-center selector valve |
| 1) Relief valves are used in pneumatic systems as damage prevention 2) Check valves are used in both hydraulic and pneumatic systems which is true? | both |
| one of the distinguishing characteristics of an open-center selector valve used in a hydraulic system is that | fluid flows through when it's off |
| what packing should be used in a system containing skydrol? | packing materials made for ester base fluids |
| relief valves are used in pneumatic systems as? | damage prevention units |
| the removal of air from hydraulic systems is done by? | bleeding the system |
| the component in the hydraulic system used to direct flow of fluid is the | selector valve |
| the purpose of the pressure regulator in a hydraulic system is to | maintain a certain range of pressures within a system |
| a flexible sealing element subject to motion is a? | packing |
| what characteristics apply to hydraulic systems? | min. maintenance lightweight easy to inspect |
| extrusion of an O-ring 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 |
| what's an advantage of piston-type motors over electric motors? | relieve system pressure |
| the first step in removing an accumulator from an A/C is to? | bleed the air from it |
| if a brake system uses packing designated for 5606, the correct servicing fluid is? | 5606 |
| the internal resistance of a fluid which tends to prevent it from flowing is called | viscosity |
| which is a characteristic of petroleum base hydraulic fluid? | flammable under normal conditions |
| 1) Use the type fluid specified in the manual to service the system 2) Hydraulic fluids are dyed a specific color for each fluid type Which is true? | both |
| petroleum base hydraulic fluid is dyed what color? | red |
| which is a characteristic of synthetic base hydraulic fluid? | high flash point |
| which statement about fluids is correct? | fluids readily transmit pressure |
| 2 types of hydraulic fluids commonly used in civil A/C are? | MIL-5606 Skydrol |
| what are the desirable properties of a good hydraulic fluid that has chemical stability? | low viscosity, high flash point, high fire point |
| where can info be obtained about the compatibility of fire-resistant fluid with A/C materials? | fluid manufacturer's technical bulletins |
| characteristics of MIL-5606 are? | red, strong scent, flammable |
| if an A/C system requires mineral base fluid, but phosphate ester is used, what will happen? | the seals will not seal properly and cause leaks |
| how can proper hydraulic fluid to be used in an airplane be determined? | aircraft mm |
| the hydraulic component that directs fluid from either the normal source or an emergency source to an actuating cylinder is? | shuttle valve |
| the primary purpose of a hydraulic actuating unit is to transform | fluid pressure into useful/ mechanical work |
| the primary function of the flap overload valve is to | prevent flaps from being lowered at airspeeds that would impose high loads |
| a unit which transforms hydraulic pressure into linear motion is called | actuating cylinder |
| unloading valves are used with many engine-driven hydraulic pumps to? | relieve hydraulic pressure |
| what safety device is usually located between the driving unit and hydraulic pump drive shaft? | pump drive coupling shear section |
| excluding lines, which components are required to make up a simple hydraulic system? | pump, reservoir, selector valve, actuator |
| in a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump from overload is the | shear pin |
| pressure is a term used to indicate the force per unit area and is measured in | PSI |
| if 2 actuating cylinders have the same are but different stroke lengths are connected to the same source, they will exert.... | equal force, same speed |
| system PSI= 100 psi hand pump 1" diameter 1/2" line connecting pump to 2" actuating cylinder what is the pressure between the pump and the actautor? | 100 psi |
| heat exchanger cooling units are required in some A/C hydraulic systems because of? | high pressure and high rates of fluid flow |
| the unit that causes one hydraulic op to follow another in an definite order is the | sequence valve |
| the purpose of a hydraulic pressure regulator is to | relieve the pump of its load when no actuating units are being operated |
| what valve permits fluid to flow in one direction but restricts the flow rate in the other direction? | orfice check valve |
| an accumulator is charged w/ a preload of 1000psi. when 3000psi is developed, what is the pressure on the air side of the accumulator? | 3000 psi |
| how is the air in an accumulator prevented from entering the fluid system? | physically separating the air chamber from the fluid chamber with a flexible separator |
| after an accumulator has been installed and air chamber charged, the main system gauge won't show a reading until | the fluid side of the accumulator has been charged |
| the device remains open to allow fluid flow, but shuts if the flow increases above a certain rate | hydraulic fuse |
| when pressure control and relief units fail to function, how are most systems protected against overpressure? | a shear section on the main pump drive shaft |
| before removing the filler cap of a pressurized reservoir, in order to service the system, you must | bleed the reservoir from the schrader valve |
| what happens to the output of a constant-displacement pump when the pressure regulator diverts the fluid from the system to the reservoir? | the output pressure reduces, but the volume remains the same |
| hydraulic system accumulators serve which of the following functions? | dampen pressure surges supplement system pump when needed store power for limited ops of components |
| chattering of the hydraulic pump is a sign of | air entering the pump |
| quick-disconnect couplings in hydraulic systems provide a means of | disconnecting the lines without getting air inside the remainder of the system |
| a hydraulic pump is a constant-displacement type if it | produces a continuous positive pressure |
| a hydraulic motor converts fluid pressure to | rotary motion |
| hydraulic fluid filtering elements constructed of porous paper are normally | discarded at regular intervals and replaced with new filtering elements |
| in a hydraulic system that has a reservoir pressurized with turbine-engine compressor air, which unit reduces pressure between the engine and the reservoir? | air pressure regulator |
Created by:
bpyles1
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