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48 Cards in this Set
- Front
- Back
Hydraulic systems have many advantages including? |
Lighter-weight easy to install Simple to inspect Minimum matience required |
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Hydraulic systems are how efficent? |
100% |
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Hydraulic fluid is considered to be? |
Inconpressible |
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The pressure exerted by a column of liquid is determined by the? |
Height of the column |
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Pascals law, the basic law for transmitting hydraulic power states that pressure in a closed system is transmitted _ and _ to _ parts of the system. |
Equally and undimished to all |
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Force per unit area is measure of? |
Pressure |
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The realshionship between, force,area, and pressure may be expressed using the formula |
Force equals area times pressure |
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In a hydraulic system the relashionship between the area of the pistion , the distance it moves, and the volume of tue fluid displaced may be expressed using the formula? |
Velocity equals area times distance . |
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Two major advantages of a hydraulic system over mechanical systems? |
1. Ease of which can be applied to a large area. 2.large gain of mechanical advantage made possible by varying the volume of the container. |
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A good hydraulic fluid must posses what properties? |
Flow with minimum opposition Be incomprehensible Have good lubrication properties Inhibit corrosion, and nit chemically attack any seals used Not foam in operation |
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What is the internal resistance of the flow of the liquid? |
Viscosity |
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What is the temperature at which liquid will give off vapor in sufficient quanity to ignite momentarly. |
Flash point |
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3 types of hydraulic fluid currently used in civilian aircraft |
Patroleum, phosphat, and vegetable |
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Is it possible to mix different hydraulic fluid |
No |
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Vegetable base hydraulic fluid is? |
Caster oil and alchohol |
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Vegetable base hydraulic fluid is dyed what color |
Color |
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Most widely used hydraulic fluid in general aircraft is |
Mil h 5056 |
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What type of hydraulic fluid is dyed red |
Mil h 5056 |
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Synthetic hydraulic fluids were developed in to provide what type of resistence use in high performancepiston, and turbine engine |
Fire |
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Skydrol is what color |
Ligh purple |
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If skydrol is spilled clean with what |
Soap and water |
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Name fluid used to flush out hydraulic systems Vegetable base Mineral base Synthetic |
Alcohol Stoddard solvent Trichlorethylene |
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Material used for seals in hydraulic systems using Vegetable Mineral Synthetic |
Natural rubber Neoplane Butyle rubber |
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All modern airplanes use a simple hydraulic system to operate? |
brakes |
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Hydraulic systems must contain what basic types of units/ |
suitable fluid, fluid reservoir, pump ,and actuators |
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Single unit containing an electrical driven hydraulic pump, reservoir, control valve and many of the auxiliary valves is known as a hydraulic |
power pack |
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Two types of hydraulic reservoirs are ? |
integral and in line |
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Aircraft that operate in the lower altitudes normally use what type of hydraulic reservoirs. |
unpressurized |
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three ways of pressurizing the system |
aspirator in return line ,bleed air, piston type |
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one micron equals |
0.000039 |
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Pleated paper micronic filters are usually installed in the hydraulic system |
return line |
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Cuno filters can be used on the pressure side of the hydraulic system. |
can |
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_ action pumps are the most common type of hand pump. |
double |
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A _ displacement pump moves a specific volume of fluid. |
constant |
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An _ valve of some sorts is needed when a constant displacement pump is used. |
relief |
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A hydraulic system using a variable displacement pump _ require an unloading valve. |
does not |
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A selector valve is one of the most common types of _ control valves ` |
flow |
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The _ center valve directs fluid throught the center of the valve back to the reservoir when a unit is not being actuated. |
open |
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A valve that allows free flow of fluid in one direction, but no flow in the opposite direction is called/ |
check |
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A valve that allows free flow of fluid in one direction but a restricted flow in the opposite direction is called |
orifice check valve |
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A valve that requires one component to fully acuate before another can actuate is called an |
sequence |
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_ Valves are similar to sequence valves except they are opened by hydraulic pressure rather than mechanical contact |
priority |
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An _ may be installed when it is necesssary to operate some portion of a hydraulic system at a pressure lower than the normal system pressure. |
hydraulic fuse |
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Two principles upon which a hydraulic fuse may operate are? |
pressure drop across fuse, and volume of liquid passing throught the fuse |
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What is the simplest type of control valve |
relief |
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what us a simple device designed to store hydraulic fluid under pressure. |
accumalator |
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an accumalator is filled with |
air and nitrogen |
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3 types of accumulators |
pistion bladder, and diaphram |