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millwright > Lubrication 1 > Flashcards

Lubrication 1 Flashcards

1
Q

Correct lubrication reduces?

A

Friction

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2
Q

Friction between moving surfaces is grouped into three main types.

A

Rolling, Sliding, Fluid

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3
Q

Bearings that use rolling members to reduce friction are called?

A

Anti friction bearings

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4
Q

The force that causes unlike materials to stick together is called? SLE/IP

A

Adhesion

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5
Q

The force that causes like materials to stick together is called? SLE/IP

A

Cohesion

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6
Q

Resistance to flow is defined as the?

A

Viscosity

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7
Q

Heating oil causes its viscosity to?

A

Decrease

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8
Q

During start up, a rotating shaft forms an?

A

Oil wedge

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9
Q

The efficiency of an oil wedge depends upon?

A

Shaft surfaces, Clearance between between surfaces, operating temperature.

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10
Q

Over lubricating threaded holes or screws may cause?

A

Hydraulic lock

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11
Q

Additives an inhibitors are introduced into oils to control?

A

Air, water, and load

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12
Q

Petroleum and vegetable oils react with oxygen, this is called?

A

Oxidation

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13
Q

The ability of a petroleum oil to seperate from water upon standing is called? SLE/IP

A

Demulsibilty

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14
Q

The ability of a petroleum oil to mix with water such as machine shop cutting fluid is ? SLE/IP

A

Emulsibility

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15
Q

Additives that are used for heavy loads or shock load conditions are called?

A

Extreme pressure additives

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16
Q

Oil lubrication is applied in two main types of systems?

A

Once through and enclosed

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17
Q

The above drawing shows?

A

Oiler rings

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18
Q

The most commonly used method of lubrication in an enclosed gear system is?

A

The splash method

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19
Q

The recommended method for lubricating high speed bearings and high velocity roller chains is the?

A

Oil mist method

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20
Q

The above drawing shows 2 lubrication systems, whats the most likely application for pump B?

A

Multiple lubrication points

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21
Q

Greases are usually made by thickening lubricating oils with?

A

Soap

22
Q

Greases recommended for water resistance and high temperature are called?

A

Lithium and barium soap

23
Q

The most common additive for increasing the anti wear capacity of a grease is?

A

Molybdenum disulfide

24
Q

The temperature at which grease becomes fluid enough to drip is called the ?

A

Dropping point.

25
Q

On low speed applications with extreme conditions of moisture, dirt, or poor sealing, it is recommended to fill the bearing housing with grease to the?

A

Full mark

26
Q

The above drawing shows a?

A

Spring compression grease cup.

27
Q

When lubrication open gears, you should consider?

A

Gear materials, Environment, Temperature.

28
Q

The type of lubrication for enclosed gears depends upon?

A

Load, Operating speed, Operating temperature.

29
Q

When the pressure between meshing gear teeth is too high, the oil film?

A

Will fail

30
Q

The oil bath bearing should not exceed the?

A

The mid point of the lowest rolling member.

31
Q

In the above diagram is the oil bath acceptable?

A

yes

32
Q

One advantage of using grease as a lubricant is?

A

It provides better start up protection after short periods of down time.

33
Q

The advantages of using oil as a lubricant are?

A

Lubricates well at high to very high speeds, Can be used as a heat exchange medium, Can be removed easily from the housing, All of the above.

34
Q

The main purpose of using cutting fluid during machining process is to?

A

Cool the work piece by reducing friction.

35
Q

Straight cutting oils may be classified as?

A

Active or in active.

36
Q

Oils that may be mixed with water and used as cutting solutions are called?

A

Emulsifiable

37
Q

Chemical oils that are soluble and contain rust inhibitors are generally used for?

A

Grinding

38
Q

When handling lubricants, it is always advisable to? IP

A

Avoid skin contact by wearing gloves an aprons etc, Avoid breathing mist or fumes, Wash hands and arms fully at the end of each shift, All of the above

39
Q

When doing lubrication preventative maintenance, the millwright should look for?

A

Low levels or lack or lubricant, Heat or smell of burn oil, Excessive noise in drive units, All of the above

40
Q

“Active” oils react with ?

A

Non ferrous metals

41
Q

Which of the following additives would be used to control the action of water in oil?

A

De-emulsifying and anti corrosion.

42
Q

The four main points to consider when selecting a lubricant is the clearance between moving parts, the operating temperatures, the weight on the moving parts and the?

A

The rubbing velocity

43
Q

The lowest temperature that an oil will run is its pour point, the lowest temperature a grease will run is called?

A

Dropping point.

44
Q

A certain machine has a operating temperature that is so high that the oil life is short. the correct approach to the problem is to?

A

Troubleshoot, lower the machine temperature through engineering, adding systems or upgrading.

45
Q

As a general rule, when the RPM of a rotating part is increased, the viscosity of the oil used will?

A

Be decreased

46
Q

The general lubricant used when drilling cast iron is?

A

No lubricant…. cause it has graphite in it

47
Q

Which of the following is the hardest or stiffest grease?

A

Number 6

48
Q

What are some common cause of lubrication problems in anti friction bearings?

A

Contaminated bearing, not enough lubricant, to much lubricant to often, all answer below

49
Q

Which of the following types of gear oil would be most probably recommended for the gear case of an over head crane?

A

Gear oil with an EP additive.

50
Q

The oil additive that retards the chemical decomposition of an oil is ?

A

Anti-oxidant.

millwright (7 decks)

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