Module 1 Flashcards
the thickness, or resistance to flow, of a fluid
Viscosity
a measure of the extent to which the viscosity of a fluid changes with changes in temperature
Viscosity Index
the lowest temperature at which a hydraulic fluid will flow
Pour point
the property of a fluid that permits it to maintain a film under heavy load
Film strength
the breakdown of emulsions
Demulsification
the pressure formed when water comes in contact with hot fluid or metal and starts to boil
Vapor pressure
The main function of a hydraulic fluid is to _____ through the system.
Transmit Power
Another function of hydraulic fluid is to reduce the _____ between two contacting machine surfaces.
Friction
A low-viscosity hydraulic fluid flows _____ than a high-viscosity fluid.
Faster
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 _____.
Reference Samples
The lowest temperature at which a fluid will flow is known as the fluid’s _____.
Pour Point
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.
Recommended
The property of a fluid that permits it to maintain a film under heavy load is referred to as its _____.
Film Strength
