Mobile test Questions
Hydraulic Fluids
1) List five functions of hydraulic fluids.
2) How much can petroleum-based fluids compress at 3,000 psi?
3) Define lubricity of a fluid.
4) Why is it important to have "full-film" lubrication between moving parts?
5) What can be done to enhance the lubricating properties of fluids?
6) Define viscosity.
7) List seven disadvantages of having the viscosity too high.
8) List four disadvantages of having the viscosity to low.
9) Define Viscosity Index.
10) Define pour point.
11) List six oxidation catalysts that may be present in poorly maintained hydraulic fluid.
12) Define flash point.
13) How does a typical rust inhibitor work?
14) List three types of anti-wear additives.
15) When are high water based fluids used?
16) List seven desirable characteristics a hydraulic fluid should have.
17) What is the percentage of problems associated with contamination?