Flashcards in Module 1 Deck (22):
the thickness, or resistance to flow, of a fluid
a measure of the extent to which the viscosity of a fluid changes with changes in temperature
the lowest temperature at which a hydraulic fluid will flow
the property of a fluid that permits it to maintain a film under heavy load
the breakdown of emulsions
the pressure formed when water comes in contact with hot fluid or metal and starts to boil
The main function of a hydraulic fluid is to _____ through the system.
Another function of hydraulic fluid is to reduce the _____ between two contacting machine surfaces.
A low-viscosity hydraulic fluid flows _____ than a high-viscosity fluid.
The change in fluid viscosity caused by a change in temperature is referred to as the fluid's _____.
Viscosity Index (VI)
The viscosity index of a fluid is found by comparing a test sample to two _____.
The lowest temperature at which a fluid will flow is known as the fluid's _____.
An economical method of compensating for high and low service temperatures is to _____ periodically.
Change the Fluid
Although hydraulic components tolerate some variation in fluid viscosity, the system should be filled only with the _____ fluid.
The property of a fluid that permits it to maintain a film under heavy load is referred to as its _____.
The term used to describe the ability of a fluid to lubricate and cling to metallic surfaces is _____.
The chemical reaction between hydraulic fluid and oxygen from the air is called _____.
Resins caused by oxidation cause hydraulic fluid to change _____.
The best method of controlling contamination in a hydraulic system is through good _____ procedures.
A fluid that resists the formation of water-fluid emulsions is said to be a(n) _____.
The chemical additive used to aid air bubbles in breaking up is called a(n) _____.