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MT 108 Chapter 3 > Module 1 > Flashcards

Flashcards in Module 1 Deck (22):
1

the thickness, or resistance to flow, of a fluid

Viscosity

2

a measure of the extent to which the viscosity of a fluid changes with changes in temperature

Viscosity Index

3

the lowest temperature at which a hydraulic fluid will flow

Pour point

4

the property of a fluid that permits it to maintain a film under heavy load

Film strength

5

the breakdown of emulsions

Demulsification

6

the pressure formed when water comes in contact with hot fluid or metal and starts to boil

Vapor pressure

7

The main function of a hydraulic fluid is to _____ through the system.

Transmit Power

8

Another function of hydraulic fluid is to reduce the _____ between two contacting machine surfaces.

Friction

9

A low-viscosity hydraulic fluid flows _____ than a high-viscosity fluid.

Faster

10

The change in fluid viscosity caused by a change in temperature is referred to as the fluid's _____.

Viscosity Index (VI)

11

The viscosity index of a fluid is found by comparing a test sample to two _____.

Reference Samples

12

The lowest temperature at which a fluid will flow is known as the fluid's _____.

Pour Point

13

An economical method of compensating for high and low service temperatures is to _____ periodically.

Change the Fluid

14

Although hydraulic components tolerate some variation in fluid viscosity, the system should be filled only with the _____ fluid.

Recommended

15

The property of a fluid that permits it to maintain a film under heavy load is referred to as its _____.

Film Strength

16

The term used to describe the ability of a fluid to lubricate and cling to metallic surfaces is _____.

Lubricity

17

The chemical reaction between hydraulic fluid and oxygen from the air is called _____.

Oxidation

18

Resins caused by oxidation cause hydraulic fluid to change _____.

Color

19

The best method of controlling contamination in a hydraulic system is through good _____ procedures.

Maintenance

20

A fluid that resists the formation of water-fluid emulsions is said to be a(n) _____.

Demulsifier

21

The chemical additive used to aid air bubbles in breaking up is called a(n) _____.

Foam Depressant

22

Any deterioration of a metallic surface caused by chemical action can be classed as _____.

Corrosion