Lubricants And Lubrication

Question 1

A thin layer of lubricant between two surfaces enables one surface to _______ the other.

Answer 1

Slide over

Question 2

By separating two surfaces slightly, lubricant helps reduce…

Answer 2

Wear

Question 3

A lubricant can equalize pressures in various places along two contacting surfaces, thereby reducing…

Answer 3

Mechanical shock

Question 4

An oil cooler radiates heat into the air, usually through its…

Answer 4

Metal fins

Question 5

By forming a slight “scab” where it is exposed to the air. grease can….

Answer 5

Seal out dirt and other contaminants

Question 6

The compounds in crude oil are classified as…

Answer 6

Hydrocarbons

Question 7

The most important property of a lubricating oil is its

Answer 7

Viscosity

Question 8

The viscosity of an industrial lubricating oil is measured in…

Answer 8

Saybolt Universal Seconds

Question 9

Grease is used in applications where liquid lubricant would leak out or where frequent lubrication is not…

Answer 9

Possible

Question 10

The “dropping point” of a grease is the same as its…

Answer 10

Melting point

Question 11

Antifoam agents are necessary additives for oils used in

Answer 11

Hydraulic systems

Question 12

Oil additives that react with metal surfaces to form a sulfide or chloride coating are called..

Answer 12

Extreme Pressure Additives

Question 13

Demulsifiers are useful oil additives when you need to

Answer 13

Remove water from the oil in the system

Question 14

Lubrication by means of a film consisting of impurities, oxides, and air molecules is called _______ lubrication

Answer 14

Boundary

Question 15

In full-film lubrication, the moving surfaces are…

Answer 15

Completely separated from each other

Question 16

Of the following oil blends, the one that undergoes the least change in viscosity as the temperature changes consists of ____% naphthene- base oil and _____% paraffin- base oil

Answer 16

10; 90

Question 17

The highest quality circulating oil is _____ oil.

Answer 17

Turbine

Question 18

One of the most important additives in hydraulic oil is a(n) _______ additive

Answer 18

Antifoam

Question 19

Spindle oils are premium-grade lubricants with a(n)….

Answer 19

Low viscosity

Question 20

Animal fat is sometimes included in ______ oil to help it stick to the surfaces being lubricated

Answer 20

Steam cylinder

Question 21

The function of the soap in a grease Is to…

Answer 21

Hold the oil

Question 22

Calcium-soap greases begin to______ of the temperature rises above 180° F

Answer 22

Dry out

Question 23

Sodium-soap greases are good_______ purpose greases for use in the ______ of water

Answer 23

General; Absence

Question 24

Lithium-soap greases work well over a ______ range of temperatures in the ______ of water

Answer 24

Wide; presence

Question 25

Nonsoap bases for greases include clay minerals, gels, and

Answer 25

Organic complexes

Question 26

Additives can protect a grease from changes in

Answer 26

Chemical makeup

Question 27

The ability of an EP grease to overcome short-cycle, high-load conditions depends on the_______ of the _______ in the grease

Answer 27

Film strength; oil

Question 28

The primary characteristic of calcium soap greases is their resistance to

Answer 28

Water

Question 29

The particles of a "lamellar" additive are _____ in shape

Answer 29

Thin and flat

Question 30

In a silicone grease, the lubricant is a ________ and the thickener is a ______ material

Answer 30

Synthetic polymer; soap or non soap

Question 31

One of the operating requirements of a lubricating device is its ability to

Answer 31

Regulate lubricant flow

Question 32

Drip-feed oiling depends on _____ for its operation

Answer 32

Gravity

Question 33

The sump for a splash- or ring type natural lubrication system is (a)

Answer 33

Part of the machine housing

Question 34

Most pressure lubrication systems have ____ pumps

Answer 34

Gear

Question 35

Mist lubrication systems are similar operation to air line lubricators, but they handle ______ lubricant at a ______ pressure

Answer 35

More; lower

Question 36

In some positive feed oil lubrication systems, the pump must both increase the oil pressure and _____ the oil

Answer 36

Meter

Question 37

A reciprocating force-feed lubricator can be adjusted to______ the flow of lubricant

Answer 37

Control

Question 38

In metered lubrication, lubricant is dispensed to the individual lubrication points by (a)

Answer 38

Separate metering devices

Question 39

In a two-line header lubrication system, the control valve

Answer 39

Reverses the lubricant flow

Question 40

A centralized lubrication system is also called _____ metering

Answer 40

Progressive

Question 41

In addition to weather and dirt, a plant's _______ should be considered in protecting stored outside

Answer 41

Environment

Question 42

New grease being added to a grease distribution system should be

Answer 42

At room temperature

Question 43

Used lubrication oils can be made suitable for reuse by purification or

Answer 43

Reclamation

Question 44

The gravity settling method of purifying oil is

Answer 44

Effective

Question 45

Final filtering of fluids can be accomplished by using

Answer 45

Sintered metal

Question 46

The greatest single cause of lubricant failure is

Answer 46

Contamination of the lubricant

Question 47

The main purpose of using route sheets for all lubricators is to

Answer 47

Make sure all lubrication is performed

Question 48

One of the best ways to prevent lubricators from using the wrong lubricant is to provide

Answer 48

Color-coded fittings on the equipment

Question 49

The first step in computerizing a plants lubrication program is to

Answer 49

Survey all lubrication requirements

Question 50

Which number means “monthly” In a 5-day workweek coding system

Answer 50

20