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Questions and Answers List

level questions: Level 1

QuestionAnswer
Pascal's lawpressure exerted on a fluid in an enclosed container is transmitted equally and undiminished to all parts of the container and acts as right angles to enclosing walls.
When is mechanical advantage achieved in a hydraulic system ?By having an output piston that is larger than the input piston
Viscosityis the internal resistance to flow
viscosity increases as ........temp decreases
what happens if fluid is to thick ?it causes power loss and higher operating temps
what happens if the fluid is too thin?it will lead to excessive wear of parts that are under load or that move due to friction
Flash pointis the temp at which a fluid gives off enough vapour to ignite momentarily when exposed to a flame. A high flash point is desirable for hydraulic fluid
fire pointis the temp at which a fluid gives off enough vapour to ignite and continue to burn when exposed to a flame.A high fire point is also desirable
if the system is contaminated with the wrong fluid you must....?drain and flush. the system before operation
can you mix hydraulic fluid ?NO NEVER.
Vegetable based fluid also called ...MIL-H-7644
Vegetable based fluid id died .....Blue
mineral based fluid is also called ?MIL-H-5606
It is diedRED
what kind of seals and hoses does MIL-H-5606 use ?Neoprene
phosphate ester based is died ?PURPLE
phosphate is used in what kind of aircraft ?modern large aircraft and high performance
fire resistant to ......6000 degrees F (almost non flammable )
Phosphate Ester is also calledMIL-H-8446
The most common trade name isSKYDROL
seals and hoses consist ofButyl, sillicon rubber and teflon
MIL-H-8446 can be flushed with ?Trichloroethylene
What is the most widely used fluid in general aviation aircraft ?MIL-H-5606 (Mineral based)
what are the effects of air getting into the system ?air causes spongy response during system operation
What the effects of water getting into the system ?will cause corrosion of metallic surfaces, microorganisms will grow and spread in hydraulic fluid and will clog filters and reduce system performance