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Secunduh > Lubezz 2 > Flashcards

Lubezz 2 Flashcards

1
Q

A thin layer of lubricant between 2 surfaces enables one surface to [BLANK] the other

A

Slide over

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2
Q

By separating 2 surfaces slightly, a lubricant helps reduce

A

Wear

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3
Q

A lubricant can equalize pressures in various places along 2 contacting surfaces, thereby reducing

A

Mechanical shock

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4
Q

An air 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 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 a system

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14
Q

Lubrication by means of a film consisting of impurities, oxides, and air molecules is called [BLANK] 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 [BLANK] % naphthene-base oil and [BLANK] % paraffin-base oil

A

10; 90

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17
Q

The highest quality of circulating oil is [BLANK] oil

A

Turbine

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18
Q

One of the most important additive in hydraulic oil is an [BLANK] additive

A

Antifoam

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19
Q

Spindle oils are premium-grade lubricants with a

A

Low viscosity

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20
Q

Animal fat is sometimes included in [BLANK] oil to help it stick to the surfaces being lubricated

A

Steam cylinder

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21
Q

The function of a soap in a grease is to

A

Hold the oil

22
Q

Calcium-soap greases begin to [BLANK] if the temperature rises above 180 degrees F

A

Dry out

23
Q

Sodium-soap greases are good [BLANK]-purpose greases for use in the [BLANK] of water

A

General; absence

24
Q

Lithium-soap greases work well over a [BLANK] range of temperatures in the [BLANK] of water

A

Wide; presence

25
Q

Nonsoap bases for greases include clay minerals, gels, and

A

Organic complexes

26
Q

Additives can help 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 [BLANK] of the [BLANK] 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 [BLANK] in shape

A

Thin and flat

30
Q

In a silicone grease, the lubricant is a [BLANK] and the thickener is a [BLANK] material

A

Synthetic polymer; soap or nonsoap

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 [BLANK] for its operation

A

Gravity

33
Q

The sump for a splash- or ring-type natural lubricating system is

A

Part of the machine housing

34
Q

Most pressure lubrication systems have [BLANK] pumps

A

Gear

35
Q

Mist lubrication systems are similar in operation to air line lubricators, but they handle [BLANK] lubricant at a [BLANK] pressure

A

More; lower

36
Q

In some positive feed oil lubrication systems, the pump must both increase the oil pressure and [BLANK] the oil

A

Meter

37
Q

A reciprocating force-feed lubricator can be adjusted to [BLANK] the flow of the lubricant

A

Control

38
Q

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

A

Separate metering devices

39
Q

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

A

Reverses the lubricant flow

40
Q

A centralized lubricating system is also called [BLANK] metering

A

Progressive

41
Q

In addition to weather and dirt, a plant’s [BLANK] should be considered in protecting lubricants stored outside

A

Environment

42
Q

New grease being added to a grease distribution system should be

A

At room temperature

43
Q

Used lubricating oils and be made suitable for use 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 single greatest 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 plant’s lubrication program is to

A

Survey all lubrication requirements

50
Q

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

A

20

Secunduh (8 decks)

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