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4 Advantages of hydraulics systems?
- Lighter weight
- Ease of installation
- Simplification of inspection
- Minimum maintenance requirements
Hydraulic systems are almost _____% efficient.
Hydraulic fluid is considered to be compressible or incompressible.
The pressure exerted by a column of liquid is determined by height of the column or the volume of the container?
height of the column
Pascal's law states that the pressure in a closed system is transmitted ____and ____ to _____parts of the system.
equally and undiminished to all parts of the system
Force per unit area is a measure of?
Pressure, measured in PSI or Kilos per square cm
The relationship between Force, area, and pressure may be expressed using the formula?
In a hydraulic system the relationship between the area of the piston, distance it moves , and the volume of displaced fluid may be expressed by the formula______.
Volume = Area x Distance
What are 2 major advantage to hydraulic systems over mechanical systems?
- 1 Large gain in mechanical advantage by using different sized pistons.
- 2 Ease that force can be transmitted over large distances
A good hydraulic fluid must possess 4 propeties.
- Proper viscosity
- Chemical stability
- High flashpoint
- High firepoint
What is the proper viscosity for hydraulic fluid?
Thick enough to seal and lubricate but not too thick as to offer excessive friction
_______ is the internal resistance to fluid flow of a liquid.
The temperature that a fluid gives off vapor in sufficient quantity to ignite momentarily is called?
3 types of hydraulic fluid currently being used in civilian aircraft are:
- Vegetable based (Mil-H-7644)
- Mineral based (Mil-H-5606)
- Synthetic (Skydrol)
Is it permissible to mix different types of hydraulic fluid?
What is an example of a phosphate ester based fluid?
Vegetable base hydraulic fluid is essentially ______ oil and ______.
Castor oil and alcohol
Vegetable based hydraulic fluid is dyed _____.
What hydraulic fluid is dyed red ?
The most widely used hydraulic fluid in use today?
Skydrol is colored ?
Synthetic hydraulic fluid was designed to provide a _____ resistant hydraulic fluid
If skydrol is spilled , it should be cleaned immediately with ______ and _______.
Soap and water
What fluid can be used to flush the hydraulic system of these fluids
- 1 Alcohol
- 2 Naptha , varsol or stoddart solvents
- 3 trichlorethylene
What seal materials are used with the following hydraulic fluids:
- 1 Natural rubber
- 2 Neoprene
- 3 Butyl rubber or ethylene-propylene elastomers
The additives in 5606 help reduce____.