Fluid Power and Landing Gear
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| the most commonly used type of seal is the | O-ring
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| which valve allows free fluid flow in one direction and none in the other? | check valve
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| valve that directs pressurized fluid to one end of an actuating cylinder; also directs return fluid to the reservoir | open-center selector valve
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| 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
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| 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
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| what packing should be used in a system containing skydrol? | packing materials made for ester base fluids
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| relief valves are used in pneumatic systems as? | damage prevention units
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| the removal of air from hydraulic systems is done by? | bleeding the system
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| the component in the hydraulic system used to direct flow of fluid is the | selector valve
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| the purpose of the pressure regulator in a hydraulic system is to | maintain a certain range of pressures within a system
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| a flexible sealing element subject to motion is a? | packing
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| what characteristics apply to hydraulic systems? | min. maintenance
lightweight
easy to inspect
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| 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
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| what's an advantage of piston-type motors over electric motors? | relieve system pressure
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| the first step in removing an accumulator from an A/C is to? | bleed the air from it
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| if a brake system uses packing designated for 5606, the correct servicing fluid is? | 5606
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| the internal resistance of a fluid which tends to prevent it from flowing is called | viscosity
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| which is a characteristic of petroleum base hydraulic fluid? | flammable under normal conditions
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| 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
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| petroleum base hydraulic fluid is dyed what color? | red
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| which is a characteristic of synthetic base hydraulic fluid? | high flash point
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| which statement about fluids is correct? | fluids readily transmit pressure
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| 2 types of hydraulic fluids commonly used in civil A/C are? | MIL-5606
Skydrol
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| what are the desirable properties of a good hydraulic fluid that has chemical stability? | low viscosity, high flash point, high fire point
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| where can info be obtained about the compatibility of fire-resistant fluid with A/C materials? | fluid manufacturer's technical bulletins
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| characteristics of MIL-5606 are? | red, strong scent, flammable
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| 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
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| how can proper hydraulic fluid to be used in an airplane be determined? | aircraft mm
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| the hydraulic component that directs fluid from either the normal source or an emergency source to an actuating cylinder is? | shuttle valve
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| the primary purpose of a hydraulic actuating unit is to transform | fluid pressure into useful/ mechanical work
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| the primary function of the flap overload valve is to | prevent flaps from being lowered at airspeeds that would impose high loads
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| a unit which transforms hydraulic pressure into linear motion is called | actuating cylinder
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| unloading valves are used with many engine-driven hydraulic pumps to? | relieve hydraulic pressure
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| what safety device is usually located between the driving unit and hydraulic pump drive shaft? | pump drive coupling shear section
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| excluding lines, which components are required to make up a simple hydraulic system? | pump, reservoir, selector valve, actuator
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| in a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump from overload is the | shear pin
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| pressure is a term used to indicate the force per unit area and is measured in | PSI
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| 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
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| 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
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| heat exchanger cooling units are required in some A/C hydraulic systems because of? | high pressure and high rates of fluid flow
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| the unit that causes one hydraulic op to follow another in an definite order is the | sequence valve
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| the purpose of a hydraulic pressure regulator is to | relieve the pump of its load when no actuating units are being operated
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| what valve permits fluid to flow in one direction but restricts the flow rate in the other direction? | orfice check valve
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| 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
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| 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
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| 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
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| the device remains open to allow fluid flow, but shuts if the flow increases above a certain rate | hydraulic fuse
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| 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
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| before removing the filler cap of a pressurized reservoir, in order to service the system, you must | bleed the reservoir from the schrader valve
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| 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
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| hydraulic system accumulators serve which of the following functions? | dampen pressure surges
supplement system pump when needed
store power for limited ops of components
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| chattering of the hydraulic pump is a sign of | air entering the pump
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| quick-disconnect couplings in hydraulic systems provide a means of | disconnecting the lines without getting air inside the remainder of the system
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| a hydraulic pump is a constant-displacement type if it | produces a continuous positive pressure
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| a hydraulic motor converts fluid pressure to | rotary motion
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| hydraulic fluid filtering elements constructed of porous paper are normally | discarded at regular intervals and replaced with new filtering elements
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| 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
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Created by:
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