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2nd 6 Month Final > Lubricants And Lubrication > Flashcards

Lubricants And Lubrication Flashcards

1
Q

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

A

Slide over

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2
Q

By separating two surfaces slightly, lubricant helps reduce…

A

Wear

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3
Q

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

A

Mechanical shock

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4
Q

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

A

Metal fins

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5
Q

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

A

Seal out dirt and other contaminants

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6
Q

The compounds in crude oil are classified as…

A

Hydrocarbons

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7
Q

The most important property of a lubricating oil is its

A

Viscosity

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8
Q

The viscosity of an industrial lubricating oil is measured in…

A

Saybolt Universal Seconds

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9
Q

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

A

Possible

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10
Q

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

A

Melting point

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11
Q

Antifoam agents are necessary additives for oils used in

A

Hydraulic systems

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12
Q

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

A

Extreme Pressure Additives

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13
Q

Demulsifiers are useful oil additives when you need to

A

Remove water from the oil in the system

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14
Q

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

A

Boundary

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15
Q

In full-film lubrication, the moving surfaces are…

A

Completely separated from each other

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16
Q

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

A

10; 90

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17
Q

The highest quality circulating oil is _____ oil.

A

Turbine

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18
Q

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

A

Antifoam

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19
Q

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

A

Low viscosity

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20
Q

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

A

Steam cylinder

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21
Q

The function of the soap in a grease Is to…

A

Hold the oil

22
Q

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

A

Dry out

23
Q

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

A

General; Absence

24
Q

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

A

Wide; presence

25
Q

Nonsoap bases for greases include clay minerals, gels, and

A

Organic complexes

26
Q

Additives can protect a grease from changes in

A

Chemical makeup

27
Q

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

A

Film strength; oil

28
Q

The primary characteristic of calcium soap greases is their resistance to

A

Water

29
Q

The particles of a “lamellar” additive are _____ in shape

A

Thin and flat

30
Q

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

A

Synthetic polymer; soap or non soap

31
Q

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

A

Regulate lubricant flow

32
Q

Drip-feed oiling depends on _____ for its operation

A

Gravity

33
Q

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

A

Part of the machine housing

34
Q

Most pressure lubrication systems have ____ pumps

A

Gear

35
Q

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

A

More; lower

36
Q

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

A

Meter

37
Q

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

A

Control

38
Q

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

A

Separate metering devices

39
Q

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

A

Reverses the lubricant flow

40
Q

A centralized lubrication system is also called _____ metering

A

Progressive

41
Q

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

A

Environment

42
Q

New grease being added to a grease distribution system should be

A

At room temperature

43
Q

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

A

Reclamation

44
Q

The gravity settling method of purifying oil is

A

Effective

45
Q

Final filtering of fluids can be accomplished by using

A

Sintered metal

46
Q

The greatest single cause of lubricant failure is

A

Contamination of the lubricant

47
Q

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

A

Make sure all lubrication is performed

48
Q

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

A

Color-coded fittings on the equipment

49
Q

The first step in computerizing a plants lubrication program is to

A

Survey all lubrication requirements

50
Q

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

A

20

2nd 6 Month Final (10 decks)

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