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Industrial Mechanic (Millwright) > Lubrication - Part B (160201fB) > Flashcards

Lubrication - Part B (160201fB) Flashcards

1
Q

Why is it important not to allow the oil level in an oil bath lubrication system to go above the centreline of the lowest rolling element?

A

To avoid churning, which would produce extra heat

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2
Q

What are two disadvantages of a bottle lubricator?

A
  • Oil is not recirculated, but wasted

- It is restricted to uses where surface speeds are low (under 1000 RPM)

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3
Q

Can a wick feed lubricator be mounted below a bearing?

A

Yes

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4
Q

Should a constant level lubricator be mounted on the left or the right side of the housing if the rotation is clockwise?

A

Left side

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5
Q

What are four disadvantages of ring or chain oilers?

A
  • Ring oilers are limited to shafts under 4 inches.
  • Rings or chains can wear through and break without being noticed, leading to lubrication failure.
  • They only work on horizontal shafts.
  • They only work dependable on stationary equipment.
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6
Q

What are two important functions of a sight glass on a lubrication system?

A
  • To monitor the oil level

- To monitor the condition of the oil

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7
Q

What component should be added to a pressure lubricating system if the oil is exposed to temperatures above 55°C?

A

A heat exchanger

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8
Q

What are three (3) limitations of an oil mist system?

A
  • The oil must be kept above 20°C to keep it in suspension
  • It can only be used where oil mist will not endanger health
  • It is not suitable for high-temperature applications, as oil mist oxidizes more rapidly
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9
Q

What are three advantages of an air-oil system?

A
  • It pressurizes the bearing housings, which prevents contaminants from entering
  • It consumes very little oil
  • It promotes long bearing life by delivering cool, clean oil in the correct amount
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10
Q

Where would a block lubricating system normally be used?

A

On large stationary engine and reciprocating compressors

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11
Q

Should a constant level lubricator be mounted on the left or the right side of the housing if the rotation is clockwise?

A

Left side

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12
Q

What is the recommended level of oil in a bearing?

A

No higher than halfway up the lowest rolling element.

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13
Q

Which is the best one to use if you need it bonded to a surface permanently (oil, grease, solid lubricants)?

A

Solid lubricants

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14
Q

Which solid lubricant has the greater load-carrying capacity, graphite or Teflon?

A

Graphite

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15
Q

Which is the best one to use to carry away heat (oil, grease, solid lubricants)?

A

Oil

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16
Q

Which is the best one to use to flush away contaminants (oil, grease, solid lubricants)?

A

Oil

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17
Q

Which lubricant may be used where oil and grease are not adequate?

A

Solid lubricants

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18
Q

What colour is graphite type solid lubricant?

A

Grey-black

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19
Q

What are the three (3) types of solid lubricants often used in industry?

A
  • Graphite
  • PTFE (Teflon)
  • Molybdenum disulphide
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20
Q

How full should the housing be for a grease-lubed bearing?

A

Housing should not be more than 1/3 full

21
Q

Give two advantages of centralized lube systems.

A
  • Eliminates the risk of contamination from dirt on a grease gun nozzle or dirt getting into grease cup when you refill it.
  • Metering valves ensure that the correct quantity of lubricant is applied.
22
Q

What is necessary before injecting grease into a grease nipple?

A

Clean the grease fitting thoroughly before attaching the grease gun.

23
Q

What types of grease cups are considered automatic?

A

Spring-loaded and electric timer style.

24
Q

What is a disadvantage of a singe point grease application system?

A

When there is a large number of lubrication point, in which case more time is required to monitor the process.

25
Q

What is an advantage of a single point grease application system?

A

Simple, compact and inexpensive.

26
Q

What is the purpose of having EP additives in a grease?

A

To prevent damage from welding at the tips of the asperities on the loaded surfaces.

27
Q

What does grease consistency depend on?

A

Type of thickener, quantity of thickener and temperature.

28
Q

Why should you not use grease with different thickeners?

A

Mixing results in a softer grease with a lower usable operating temperature.

29
Q

Why should you not use grease with different thickeners?

A

Mixing results in a softer grease with a lower usable operating temperature.

30
Q

What is one of the oldest grease thickeners used?

A

Soap

31
Q

Why should oil samples be taken at regular intervals for testing?

A

To establish a performance trend for the oil and a wear rate for the machine

32
Q

What is drop point referring to in a grease?

A

This is the lowest temperature at which the lubricant begins to drip from grease.

33
Q

How does a grease thickener work?

A

The thickener acts like a sponge to hold the lubricant and also controls the flow of the grease to the area to be lubricated.

34
Q

What is a grease?

A

Grease is a liquid lubricant mixed with a thickener.

35
Q

What are two advantages in sending used oil for re-refining?

A
  • It prevents possible contamination of the environment

- It provides a supply of top-quality oil

36
Q

Does new oil meet manufacturers’ recommended standards for bearings?

A

No

37
Q

What are the two main safety concerns when handling or storing lubricants?

A
  • Cancer

- Fire

38
Q

Give three reasons for on-line flushing.

A
  • To remove contaminants
  • To remove preservatives
  • To reduce the particle count in new oil
39
Q

Is it best to take an oil sample immediately after a machine has been running at its normal operating temperature or after it has cooled down?

A

Immediately after running, to establish a wear rate for the machine

40
Q

How can you tell if the particle count in a lab report is excessive or not?

A

By comparing the count to the target cleanliness levels specified by the manufacturer

41
Q

What does the silicone particle count indicate?

A

The amount of dirt ingested through the seals and breather

42
Q

How is the wear rate of components determined?

A

It is based on a change in spectroscopy numbers

43
Q

Does the number of parts per million on a spectroscopy report indicate the actual amount of wear on components?

A

No

44
Q

Proper level of lubricant in a rolling element bearing is ________________________.

A

halfway up the lowest rolling element.

45
Q

Movement of oil in a wick feed oiler is by __________.

A

capillary action

46
Q

A measure of grease stiffness is referred to as _________.

A

consistency.

47
Q

Thickeners for grease can be made from compounds that are classified chemically as _________.

A

soaps.

48
Q

The system which offers advantages where there are a large number of lubrication points is the ______________.

A

centralized lubrication system.

Industrial Mechanic (Millwright) (11 decks)

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