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Millright Thoery 2/ March > bearing and lubrication assignments and quizs > Flashcards

bearing and lubrication assignments and quizs Flashcards

1
Q

The measure of oil’s ability to flow is known as

a) it’s flashpoint
b) it’s pour point
c) it’s emulsibility
d) it’s viscosity

A

d) it’s viscosity

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2
Q

The lubrication entry point for an oil lift bearing would be

a) in the loaded zone
b) 180 opposite to the loaded zone
c) 90 from the unloaded zone in the direction of rotation
d) 90 from the unloaded zone opposite to the direction of rotation

A

a) in the loaded zone

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3
Q

Of the following, which lubrication system would be best suited for large compressor applications?

a) air/oil systems
b) block lubrication system
c) mechanical lubrication system
d) oil mist system

A

b) block lubrication system

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4
Q

Under general conditions, when applying grease to a bearing in pillow block housing, the bearing should be packed

a) full with the housing left empty
b) halfway up the bottom rolling element
c) 80% to 100% full, with the housing packed 1/3 to 1/2 full
d) 1/3 to 1/2 full, with the housing also packed 1/3 to 1/2 full

A

c) 80% to 100% full, with the housing packed 1/3 to 1/2 full

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5
Q

Oil in an anti-friction nearing housing should be

a) completely covering the bottom rolling element
b) completely submerging the bearing
c) halfway up the bottom rolling element
d) halfway up the bearing

A

c) halfway up the bottom rolling element

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6
Q

Which method of lubrication is frequently recommended for high-speed, anti-friction bearings?

a) oil bath
b) oil mist lubrication
c) oil ring
d) splash lubrication

A

b) oil mist lubrication

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7
Q

A higher viscosity fluid would have ______ than a lower viscosity fluid

a) less fluid friction
b) a better viscosity index
c) greater sealing ability
d) more entrained waxes

A

c) greater sealing ability

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8
Q

Of the following which one would probably NOT be a contributor to boundary film lubrication?

a) low speeds
b) high viscosity
c) high heat
d) insufficient amount of lubricant

A

b) high viscosity

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9
Q

Which of the following is NOT a characteristic of petroleum based oils?

a) they do not wear out
b) in their pure stat they are corrosive free
c) they can be re-refined
d) they have poor demulsibility

A

d) they have poor demulsibility

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10
Q

Which type of fiction would produce the greatest heat?

a) fluid
b) rolling
c) sliding
d) mixing

A

c) sliding

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11
Q

What would be the pour point of oil if it showed no movement when held horizontally for 5 seconds at 12C?

a) 6C
b) 9C
c) 12C
d) 15C

A

d) 15C

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12
Q

Which of the following is NOT important when considering the pour point of a lubricant?

a) lowest temperature it will flow into bearings
b) lowest start-up temperature
c) lowest pump operating temperature
d) lowest viscosity index

A

d) lowest viscosity index

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13
Q

Which of the following is NOT function of the lubricant?

a) aids in sealing
b) flushes away contaminants
c) reduces friction
d) vibration

A

d) vibration

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14
Q

A bottle lubricator relies on _____ to deliver oil to the lubrication point

a) capillary action
b) centrifugal force
c) heat
d) vibration

A

d) vibration

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15
Q

Calculate the surface speed, in feet per minute, of a 2” diameter shaft turning at 120 rpm

a) 62.8 ft/min
b) 82.2 ft/min
c) 94.5 ft/min
d) 101.8 ft/min

A

b) 82.2 ft/min

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16
Q

Wick feed oilers rely on _____ to deliver oil to the lubrication point

a) capillary action
b) centrifugal force
c) gravity
d) heat

A

a) capillary action

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17
Q

Which of the following would be classified as a “soap” thickener for grease?

a) bentonite clay
b) calcium
c) polyuria
d) silicone

A

d) silicone

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18
Q

What type of lubrication method is shown below?

a) automatic
b) drip feed
c) manual
d) mechanical

A

c) manual

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19
Q

What type of lubrication method is shown below?

a) automatic
b) manual
c) electrical
d) mechanical

A

b) manual

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20
Q

What type of lubrication method is show below?

a) automatic
b) electrical
c) manual
d) mechanical

A

d) mechanical

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21
Q

The ISO basic number for each standard anti-friction bearing includes information about it’s

a) bore size
b) bearing size
c) bearing series
d) all of the above

A

d) all of the above

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22
Q

A bearing is selected for an application on the basis of

a) ease of maintenance
b) ease of installation
c) original equipment specifications
d) stocking requirements

A

c) original equipment specification

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23
Q

In a fixed and floating two-bearing mounting in an electric motor, the floating bearing is subject to

a) the thrust load
b) the radial load
c) the axial load
d) the torsional load

A

b) the radial load

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24
Q

Which one of the following roller bearing will best carry combined radial and thrust loads?

a) cylindrical
b) double row cylindrical
c) needle
d) tapered roller

A

d) tapered roller

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25
Q

Spherical roller bearing clearance is best measured with

a) feeler gauges
b) internal and external micrometers
c) taper gauges
d) vernier calipers

A

a) feeler gauges

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26
Q

Which of the following bearings is sometimes referred as a cup and cone?

a) angular contact bearing
b) ball thrust bearing
c) needle bearing
d) tapered roller bearing

A

d) tapered roller bearing

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27
Q

An external self-aligning ball bearing gets its misalignment capabilities by

a) using a spherical roller bearing
b) slotted mounting hoes in the bearing housing
c) using a curved raceway in the outer ring
d) a spherical seat between the outer ring and the outer housing

A

d) a spherical seat between the outer ring and the outer housing

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28
Q

A bearing with the suffix “K” means

a) a 12 to 1 tapered bore
b) a 30 to 1 tapered bore
c) increased internal clearances
d) shielded on one side only

A

a) a 12 to 1 tapered bore

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29
Q

An improperly placed ground while welding on equipment is likely to cause what bearing damage?

a) contamination
b) corrosion
c) pitting
d) spalling

A

c) pitting

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30
Q

A sealed bearing should never be heated above

a) 175f/80c
b) 200f/94c
c) 225f/108c
d) 250f/120c

A

a) 175f/80c

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31
Q

When using compressed air to dry or clean an anti-friction bearing, it should be

a) held by the cage
b) held by the inner ring
c) held by the outer ring
d) held by both rings

A

d) held by both rings

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32
Q

What is the meaning of C3 in a bearing suffix?

a) clearance greater than normal
b) clearance smaller than normal
c) tolerance greater than normal
d) tolerance smaller than normal

A

a) clearance greater than normal

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33
Q

What bearing type would be have a designation number starting with 2?

a) angular contact bearing
b) needle bearing
c) single row deep groove ball bearing
d) spherical roller bearing

A

d) spherical roller bearing

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34
Q

What would be a fit chart read of [k6, 4L- 6T] tell you?

a) outer ring to housing, interference fit
b) outer ring to housing, clearance fit
c) bearing bore to shaft, transition fit
d) bearing bore to shaft, clearance

A

c) bearing bore to shaft, transition fit

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35
Q

Which one of the following is not recommended when heating a bearing for installation?

a) hot oil bath
b) direct flame
c) heating cabinet
d) induction heating

A

b) direct flame

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36
Q

You are mounting a spherical roller bearing with a tapered bore, what would the installed clearance be if the bench clearance was 0.006 inches?

a) 0.001 inches
b) 0.002 inches
c) 0.003 inches
d) 0.004 inches

A

c) 0.003 inches

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37
Q

A 6201 bearing would have a bearing bore of ____

a) 5 millimeters
b) 10 millmeters
c) 12 millimeters
d) 17 millimeters

A

c) 12 millimeters

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38
Q

The bearing shown below would have a number designation starting with ____

a) 3
b) 5
c) 6
d) 8

A

b) 5

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39
Q

What is the most important property of a lubricant?

A

viscosity

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40
Q

What three factors can change a fluids viscosity?

A

temp, load/pressure, speed

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41
Q

What are the two units of viscosity?

A

cst, sus

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42
Q

Where is the heat generated in fluid friction?

A

pressure/tearing and breaking of their molecules

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43
Q

Why is understanding pour point important?

A

pour point of oil is where at the lowest temp oil will stop flowing when horizontally for 5 seconds and then plus 3 degrees (its important to know what oil to put in so oil will flow into bearings)

44
Q

Transmission viscosity grades are the same engine viscosity grades

A

false

45
Q

Define: viscosity index

A

change of viscosity through a temperature range 40 degrees to 100 degrees good viscosity at 150 degrees

46
Q

Where can you find information regarding the safety precautions about lubricants?

A

MSDS

47
Q

Plain journal bearing material should be ____ the journal

a) harder than
b) softer than
c) the same material as
d) the same hardness as

A

b) softer than

48
Q

The lubricant would enter a hydrodynamic plain bearing

a) in the loaded area of the bearing
b) in the unloaded area of the bearing
c) only 90 degrees to the shaft axis
d) only 180 degrees to the shaft axis

A

b) in the unloaded area of the bearing

49
Q

Crush is necessary in plain bearings to

a) ensure the proper shell location
b) ensure proper heat transfer from the shell to the housing
c) ensure the correct radial clearance
d) ensure the proper axial clearance

A

b) ensure proper heat transfer from the shell to the housing

50
Q

Of the following plain bearing materials, which one would provide the best embeddability?

a) aluminum
b) bronze
c) lead based Babbitt
d) tin/silicon matrix

A

c) lead based Babbitt

51
Q

What would be one advantage to using Teflon (PTFE) as a plain journal bearing material?

a) provides high loading capabilities
b) can be used in high temperature applications
c) has self-lubricating characteristics
d) does not require machining when used as a bushing

A

c) has self-lubricating characteristics

52
Q

A bushing made with a soft lining material backed by an outer metal jacket is called a

a) tri metal bushing
b) sleeved bushing
c) bi-metal bushing
d) wrapped bushing

A

d) wrapped bushing

53
Q

Which of the following materials would not be used for a water bushing?

a) sintered bronze
b) rubber
c) PTFE (Teflon)
d) nylon

A

a) sintered bronze

54
Q

Sintered bronze can hold _____ of its volume in oil

a) 1 to 10%
b) 2 to 20%
c) 3 to 30%
d) 4 to 40%

A

c) 3 to 30%

55
Q

Which of the following statements concerning dry lubricated bearings is incorrect?

a) can be used when the bearing is inaccessible
b) can be used where normal lubrication is impractical
c) can be used in high temperature applications
d) can be used for high speed applications

A

d) can be used for high speed applications

56
Q

Which of the following statements in incorrect concerning hydrodynamic bearings?

a) do not form an oil wedge
b) do not have to be supplied with a lubrication groove
c) do not need an oil pump
d) rely on speed for proper lubrication

A

a) do not form an oil wedge

57
Q

The minimum turning speed for a hydrostatic bearing would be

a) 125 rpm
b) 200 rpm
c) 300 rpm
d) no minimum turning speed

A

d) no minimum turning speed

58
Q

Which of the following methods would not be used to check clearance in a plain bearing?

a) plastigage
b) lift check
c) Prussian blue
d) shims/feeler gauges

A

c) Prussian blue

59
Q

What method would not be recommended when seating a bushing?

a) hammer and punch
b) adapter and driver
c) arbor press
d) draw bolt and pusher plate

A

a) hammer and punch

60
Q

The minimum required contact area for bearing to journal contact should be

a) 75%
b) 80%
c) 85%
d) 90%

A

c) 85%

61
Q

The two main functions of a plain journal bearing are

a) to ensure oil wedge and lift
b) to provide wettability and conformability
c) eliminate critical speeds and eliminate vibration
d) support intended radial load and hold in required location

A

d) support intended radial load and hold in required location

62
Q

Which of the following bearing materials would have the best conformability?

a) aluminum
b) bronze
c) copper
d) lead-based Babbitt

A

d) lead-based Babbitt

63
Q

Which of the following plain bearing materials would have the highest load rating?

a) lead based Babbitt
b) Teflon
c) tin base Babbitt
d) tin/silicon matrix

A

d) tin/silicon matrix

64
Q

The ability a of plain bearing material to resist welding onto the shaft during periods of boundary lubrication is called

a) conformability
b) compatibility
c) corrosion resistance
d) embeddability

A

b) compatibility

65
Q

Which of the following sintered bronze (iolite) bushing would have the highest load rating?

a) 3% oil volume
b) 12% oil volume
c) 18% oil volume
d) 30% oil volume

A

a) 3% oil volume

66
Q

List the three kinds of friction and provide an example for each one

A

sliding - is the resistance to movement that is produce when on surface slides across

67
Q

Which type of friction would produce the greatest heat?

A

sliding friction

68
Q

What is the definition for viscosity?

A

viscosity is a measurement of fluid friction. resistance to flow

69
Q

How would an increase in viscosity affect the load strength of a lubricant?

A

the higher the viscosity, the higher the load capacity of the

70
Q

How would a decrease in viscosity affect the power consumption of a machine?

A

viscosity affects the power consumption of a machine the higher the viscosity affects the power consumption of a machine

71
Q

How would an increase in temperature affect viscosity?

A

As temp increases viscosity decreases. as temperature rise, molecular activity increases, braking some of the electromagnetic bonds

72
Q

What is the worldwide accepted unit of measurement of oil’s viscosity?

A

centistoke

73
Q

What does the viscosity index of oil indicate?

A

identifies the amount of change in the viscosity of a lubricant over a temperature

74
Q

How is the pour point of oil determined?

A

pour point is 3 degrees above the temperature at which the oil shows no movement from a container held horizontally for 5 seconds

75
Q

Why is important to know the pour point of oil?

A

because it determines the lowest temperature at which oil will flow into the bearings, etc

76
Q

What is the flash point of oil and what is it importance?

A

flash point is the lowest temperature at which the vapour above an oil will ignite when a flame is passed over it
-indicates the fire or explosion hazard of the lubricant

77
Q

List the three stages of lubrication

A

boundary film, partial film, full film

78
Q

The type of lubricant film that forms under a loaded rolling element of a bearing is called

A

elastro-hydrodynamic film lubrication

79
Q

What percentage of an industrial lubricant (oil) would be additives?

A

22%

80
Q

The oxidation rate of petroleum-based oil doubles for every __ degrees Celsius temperature rise above __ degrees Celsius

A

8 and 55

81
Q

Under what condition would a lubricant require an EP additive?

A

when there is metal to metal contact at high loads

82
Q

What would be the correct level of oil in a pillow block housing for an anti-friction bearing?

A

1/3 to 1/2 up on the ball of the bearing

83
Q

Wick feed oilers rely on what action to deliver oil to the lubrication point?

A

the capillary action in the wick transfer the oil from the bottle

84
Q

Ring and chain oilers would be classed as what type of lubrication method?

A

hangs from the shaft into oil bath as shaft potatoes the ____ carries the oil from oil bath to flow into the bearings

85
Q

List the three types of nozzles used in an oil mist lubrication system and their application?

A

nick i can’t read your writing

86
Q

Divider block lubrication systems are designed for which application?

A

they are used on large stationary engines and reciprocating

87
Q

What is meant by the term Drop Point and what type of lubricant does it refer to?

A

is the lowest temp at which the lubricant will be to drop from a grease using a standard ….i can’t read your writing

88
Q

Up to __ of premature bearing failures are due to incorrect lubrication, therefore it is necessary to ensure that grease with different _____ should never be mixed as this will result in _____ grease with a _____ usable operating temperature.

A

nick i can’t read your writing
thickness
softer
lower

89
Q

What is the rule of thumb when packing an packing an anti-friction bearing and a pillow block housing with grease?

A

nick i can’t read your writing

90
Q

List the 3 types of dry solid lubricants and their application.

A

nick i can’t read your writing

91
Q

What is the approximate temperature of the inner ring of a bearing if the housing temperature is 80C?

A

110C

92
Q

Describe the most likely cause of the following noises heard when listening to an anti-friction bearing with a stethoscope?
Loud hollow noise:
High-pitched squeal:
Growling noise:

A

a) indicating too much infernal clearance
b) indicating that the clearance is to small
c) indicating that the surface of the rollers and raceways are deteriorating

93
Q

What is meant by built-in contamination?

A

refers to dirt be introduced during the assembly of the machine, either when it was originally built or when it was rebuilt

94
Q

Why does a temperature above 120C harm most bearings?

A

Nick i can’t read your writing

95
Q

What are four benefits of vibration monitoring?

A

Nick i can’t read your writing

96
Q

Describe brinneling and what causes it in a bearing?

A

nick i can’t read your writing

97
Q

List two cause of electrical arcing in a bearing?

A

nick i can’t read your writing

98
Q

Describe what is meant by normal fatigue?

A

is the failure or bearing up of any material after it has been repeatedly deformed

99
Q

Can the caps of the pillow blocks be interchanged? Explain the reasoning behind your answer

A

nick i can’t read your writing

100
Q

The Lip seal (external rubbing seals) develops it sealing how?

A

makes a seal by pressing the seal lip against the seal surface

101
Q

What in the purpose of the locating rings in a pillow block?

A

nick i can’t read your writing

102
Q

Why are bearings fixed and floating in a pair of pillow blocks mounted on a shaft? Which one is fixed?

A

fixed one is for alignment

floating is to allow for thermal expansion

103
Q

In which direction should the eccentric locking collar be turned to ensure that it does not loosen?

A

no answer

104
Q

Which of the split joint pillow block designs will accommodate the greatest amount of side loading?

A

can’t read your damn writing

105
Q

List three important factors that most be taken into account when installing a lip seal.

A

cant read your damn writing

Millright Thoery 2/ March (21 decks)

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