TPC Bearings Flashcards

1
Q

Anti-friction bearings are used to where

A

Low starting friction is required

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2
Q

What kind of bearing can support an axial load?

A

Thrust bearings

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3
Q

Spotty, uneven wear in a sleeve bearing is caused by _____ of the shaft

A

Bending

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4
Q

When a shaft reaches its “critical speed”, the?

A

Vibration becomes uncontrollable

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5
Q

The loosest class of fit of a shaft in a bearing is a____ fit. The tightest is a ____ fit.

A

Running and sliding ; force

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6
Q

To distribute lubricant ,plain journal bearings may have?

A

Axial and circumferential grooves

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7
Q

To keep lubricant in and dirt out, plain journals bearings have

A

Bearing seals

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8
Q

Split bearing may be either ___or ____

A

Split-sleeve , precision insert

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9
Q

In a trimetal metal bearing, the inner lining is made of?

A

Anti-friction material

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10
Q

The extra lining material extending beyond half a circle and a precision insert bearing is called?

A

Crush

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11
Q

The ability of a plain journal bearing material to adjust to misalignment is called

A

Conformability

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12
Q

The ability of a plain journal bearing material to absorb small particles is called

A

Embeddability

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13
Q

What is the best material for plain journal bearings that operate above 500F?

A

Aluminum - bronze alloys

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14
Q

You don’t need to replace bearings on high speed equipment unless where has increased the shaft clearance to_____ times the original clearance

A

Two

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15
Q

If you cut a new lubcricating groove in a plain journal bearing ,the width of the groove should be about _____ the depth. The depth should be no more than ____ the bearings wall thickness.

A

Twice ; one-third

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16
Q

Which part of an antifriction bearing carries the least load during operations?

A

Cage

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17
Q

Antifriction bearing the runs at moderate to high speeds, generally should be lubricated with

A

Oil

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18
Q

The letters “BC” in the bearing designation “10BC02” indicate the bearings

A

Type

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19
Q

The standard, bothering with the closest tolerance is designated?

A

ABEC-9

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20
Q

How far out-of-round the inner and outer races of an antifriction bearing can be is called the ______ runout of bearing

A

Radial

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21
Q

Even if nothing else causes the failure of an antifriction bearing, it will ultimately failed due to ___ of the____

A

Fatigue ; rolling elements

22
Q

Misalignment and excessive run out are major causes of bearing failure, exceeded only by

A

Inadequate lubrication

23
Q

A “floating” bearing is mounted in such a way that it moves

A

Axially

24
Q

In a fixed and floating two-bearing mounting, the fix bearing carries any ___ load

A

Thrust

25
Q

If a shoulder is cut on a shaft support, the inner race of a bearing, the shoulder should have

A

Minimum runout

26
Q

Which type of ball bearing can best support loads from all directions

A

Double-row angular-contact

27
Q

One advantage of the staggered roller bearing over an ordinary roller bearing is that it?

A

Requires less space for the same capacity

28
Q

What kind of roller bearing is the best for equipment that must run at high speed?

A

Cylindrical

29
Q

What kind of loads can a spherical roller bearing support?

A

Both axial and radial

30
Q

Which part of a tapered bearing corresponds to the outer ring on the bearings ?

A

Cup

31
Q

The best bearing for supporting very heavy thrust and shock loads is a ___ thrust bearing .

A

Tapered -roller

32
Q

A ——- bearing can accept misalignment without losing of its load-carrying capacity .

A

Spherical roller

33
Q

A ladder bearing is a ____ bearing.

A

Linear motion

34
Q

What linear-motion bearing reduces shaft deflection?

A

Open ball bushing

35
Q

Bearing units designed to provide adjustment for the shaft-center distances are known as?

A

Take ups

36
Q

A major function of a bearing seal is to ?

A

Retain lubricant

37
Q

The width of an oil seal is the ?

A

Thickness of the outer case

38
Q

An important element in the selecting the right type of seal for a bearing is the ___ of the shaft?

A

Surface speed (in fpm)

39
Q

To insure proper operation of a synthetic bearing seal, the shaft should be ?

A

Polished

40
Q

A spring closure ring on a bearing seal forces against the?

A

Shaft

41
Q

In general , lightweight oil should be used on bearings carrying ___ loads and running at ___ speeds

A

Light ; high

42
Q

Combating, the most common contamination of lubrication oil requires

A

Cleaning the sump

43
Q

Internal wear in a bearing may be detected in drained oil by the presence of

A

Metal particles

44
Q

The national lubricating grease institute specifies the hardness of a grease in numbers from—- to ——

A

000; 6

45
Q

When packing grease into a bearing, you should fill the bearing____full

A

About half

46
Q

Early bearing failure often results from

A

Improper installation

47
Q

If a ball or roller bearings or slightly misaligned when installed, they will

A

Fail sooner than they should

48
Q

If a newly installed bearing makes a high-pitched whine when it starts running the bearing may be?

A

Overloaded

49
Q

Excessive loading on a bearing causes

A

Brinelling

50
Q

Immediately after cleaning and inspecting a bearing, you should coat it with?

A

Oil