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8th 6th Month Period > TPC 343 Bearings and Shaft Seal Maintenance > Flashcards

TPC 343 Bearings and Shaft Seal Maintenance Flashcards

1
Q

The best way to determine the correct running clearance in a plain-bearing installation is to…

A

consult manufacturers charts and tables

TPC 343 p. 6

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2
Q

The ability of bearing material to flow slightly when loaded is called…

A

conformability

TPC 343 p. 7

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3
Q

The ability of bearing material to dissipate excessive heat generated during operation is called…

A

thermal conductivity

TPC 343 p. 7

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4
Q

An advantage of grease compared to oil in lubricating a plain bearing is that…

A

newly applied grease forces old lubricants out

TPC 343 p. 12

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5
Q

Discoloration in plain bearings is generally a symptom of…

A

excessive heat

TPC 343 p. 14

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6
Q

What should be used to measure the running clearance of a plain bearing?

A

feeler gauge

TPC 343 p. 6

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7
Q

What method should be used to remove moisture from a bearing shell after it has been cleaned?

A

preheating

TPC 343 p. 8

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8
Q

When building a plain bearing liner, coat the mandrel with ______ to keep molten babbit from clinging.

A

white lead

TPC 343 p. 9

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9
Q

What is the purpose of the grooves cut into a plain bearing liner?

A

circulate lubricant

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10
Q

What is the most likely cause of screeching from a plain bearing during operation?

A

clearances are too tight

TPC 343 p. 14

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11
Q

If you must leave your workplace temporarily, what care should you give a new, unmounted anti-friction bearing?

A

wrap it in oil resistant paper

TPC 343 p. 21

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12
Q

To prevent creeping of an inner bearing ring around the shaft, you should mount the inner ring with a(n) ______ fit.

A

interference

TPC 343 p. 23

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13
Q

You can force an anti-friction bearing into position on the shaft by using an arbor press or by impact, if the bearing has an OD of…

A

4 inches or less

TPC 343 p. 23

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14
Q

A bearing is driven up a split tapered adapter by…

A

tightening a heavy duty locknut

TPC 343 p. 26

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15
Q

At approximately what temperature should you begin to suspect a bearing problem?

A

185*F

TPC 343 p. 31

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16
Q

You clean an anti-friction bearing before installation if it…

A

will be lubed by auto oil-mist

TPC 343 p. 21

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17
Q

If the shoulder is too low when seating an anti-friction bearing on the shaft then the…

A

inner ring may distort

TPC 343 p. 22

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18
Q

When inspecting a tapered shaft by blueing the gauge bore, an ______% blueing transfer is acceptable.

A

80

TPC 343 p. 22

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19
Q

When cold mounting an anti-friction bearing, you must…

A

lube the bearing bore shaft with light oil

TPC 343 p. 23

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20
Q

What is not an approved way to heat a roller bearing for a temperature mount?

A

gas-operated torch

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21
Q

What is the correct tool to use when removing a locknut from an anti-friction bearing installation?

A

spanner

TPC 343 p. 37

22
Q

When you use a puller to remove a taper-mounted bearing, what should you do with the locknut?

A

Back the nut off several turns

TPC 343 p. 41

23
Q

An aluminum heating ring is designed for mounting and dismounting the inner rings of a ______ bearing.

A

cylindrical ring

TPC 343 p. 41

24
Q

When you use an aluminum heating ring to expand a bearing, heat the ring to…

A

500*F

TPC 343 p. 41

25
Q

If you have cleaned and inspected an anti-friction bearing but do not intend to reuse it immediately, how should you treat it before wrapping it in oil-resistant paper and storing it?

A

Fill it with grease

TPC 343 p. 44

26
Q

The two main methods of removing anti-friction bearings are…

A

impact and heating

TPC 343 p. 50

27
Q

What is the correct way to remove an anti-friction bearing with a diameter smaller than 4 in.?

A

arbor press

TPC 343 p. 38-39

28
Q

The two important dimensions of a bearing puller are spread and ______.

A

reach

TPC 343 p. 40

29
Q

To remove a bearing, a splitter may be used with a(n)…

A

mechanical puller

TPC 343 p. 41

30
Q

What should not be used to clean an anti-friction bearing when inspecting it?

A

steam

TPC 343 p. 43

31
Q

What type of bearing seal keeps out water, dirt, and contaminants most effectively?

A

contact seal

TPC 343 p. 55

32
Q

What type of anti-friction bearing can tolerate the most internal misalignment?

A

spherical roller bearing

TPC 343 p. 56

33
Q

The correct tolerance range for shafts from 2 to 4 in. in diameter is nominal to…

A

-.001 in

TPC 343 p. 59

34
Q

When you lubricate bearings with grease, the actual lubricant is ______, which is held in suspension.

A

mineral oil

TPC 343 p. 63

35
Q

As a rule, the interval between lubrication renewals is cut in half for every 27*F increase in temperature above…

A

160*F

TPC 343 p. 64

36
Q

A special type of pillow block sometimes used on belt conveyers is called a…

A

takeup

TPC 343 p. 53

37
Q

When using the grub screw method to hold a bearing in a pillow block, use…

A

no collar

TPC 343 p. 56

38
Q

To find the takeout amount needed to calculate final clearance when installing a bearing, refer to the…

A

manufacturer’s chart

TPC 343 p. 61

39
Q

What type of lubricant increases the effectiveness of a labyrinth seal?

A

grease

TPC 343 p. 63

40
Q

Bearing temperature is typically ______ to ______*F higher than the temperature of the housing.

A

15, 25

TPC 343 p. 64

41
Q

The threads of an acme screw are…

A

squared off and thick

TPC 343 p. 72

42
Q

Ball bearing screws are designed to…

A

move loads vertically and horizontally

TPC 343 p. 72-73

43
Q

The screw in a ball bearing screw is supported by…

A

standard ball bearings

TPC 343 p. 73

44
Q

In a contact seal, what forms the actual seal?

A

a thin film of oil

TPC 343 p. 78

45
Q

Before you install a lip seal, chamfer the end of the shaft and the leading edge of the housing bore at an angle of ______ to ______ degrees.

A

15, 30

TPC 343 p. 81

46
Q

The rolling contact of a ball bearing screw is ______% efficient.

A

90

TPC 343 p. 72

47
Q

What carries the load moved by a ball bearing screw?

A

ways

TPC 343 p. 73

48
Q

When preparing a ball bearing screw for installation, use a ______ to expand the inner ring of the bearings.

A

hot oil bath

TPC 343 p. 73

49
Q

What seal is most effective when large quantities of contaminants are present close to the machinery?

A

V-ring

TPC 343 p. 79

50
Q

What seal material works well for machines operating at extremely low temperatures?

A

silicone

TPC 343 p. 80

8th 6th Month Period (3 decks)

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