304

Question 1

Antifriction bearings are used where

Answer 1

Low starting friction is required

Question 2

Which kind of bearing can support an axial load

Answer 2

Thrust bearing

Question 3

Spotty uneven wear in a sleeve bearing is cause by ___ of the shaft

Answer 3

bending

Question 4

When a shaft reaches its critical speed the

Answer 4

vibration becomes uncontrolled

Question 5

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

Answer 5

running and sliding fit. Force

Question 6

To distribute lubricant plain journal bearings often have

Answer 6

Axial & circumferential grooves

Question 7

To keep lubricant dirt out plain journal bearings may have

Answer 7

bearing seals

Question 8

Split bearings may be either

Answer 8

split sleeve or precision insert

Question 9

in a trimetal bearing the inner lining is made of

Answer 9

anti friction material

Question 10

the extra lining material extending beyond half a circle in a precision insert bearing is called

Answer 10

crush

Question 11

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

Answer 11

conformability

Question 12

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

Answer 12

embeddability

Question 13

what is the best material for plain journal bearings that operate above 500 dgrees

Answer 13

aluminum bronze alloys

Question 14

You need not replace bearing on high speed equipment unless wear has increased the shaft clearance to ___ times the original clearance

Answer 14

two

Question 15

if you cut a new lubricant groove in a plain journal bearing the width of the groove should be about __ the depth. The depth should be no more than one___ the bearings wall thickness

Answer 15

Twice, one third

Question 16

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

Answer 16

cage

Question 17

anti friction bearings that run at moderate to high speeds generally should be lubricated with

Answer 17

oil

Question 18

the letters BC in the bearing designation 10BC02 indicate the bearings

Answer 18

type

Question 19

the standard ball bearing with the closest tolerance is designated

Answer 19

ABEC-9

Question 20

how far out of round the inner and outer races of an antifriction bearing can be is called the ___ runout of the bearing

Answer 20

Radial

Question 21

even if nothing else causes the failure of an antifriction bearing it will ultimately fail due to ___ of the ____

Answer 21

fatigue, rolling elements

Question 22

misalignment and excessive runout are major causes of bearing failure exceeded only by ___

Answer 22

inadequate lubrication

Question 23

a floating bearing is mounted in such a way that it can move

Answer 23

axially

Question 24

in a fixed and floating two bearing mounting the fixed bearings carries any __ load

Answer 24

thrust

Question 25

if a shoulder is cut in a shaft to support the inner race of a bearing the shoulder should have a

Answer 25

Minimum runout

Question 26

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

Answer 26

double row angular contact

Question 27

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

Answer 27

requires less space for the same capacity

Question 28

which kind of roller bearing is best for equipment that must run at a high speed

Answer 28

cylindrical

Question 29

what kind of loads can a spherical roller bearing support?

Answer 29

both axial & radial

Question 30

which part of a tapered roller bearing corresponds to the outer ring on other bearings?

Answer 30

cup

Question 31

the best bearing for supporting very heavy thrust & shock loads is a ____ thrust

Answer 31

tapered-roller

Question 32

An ____ bearing can accept misalignment without losing any of its load carrying capacity

Answer 32

spherical roller

Question 33

a ladder bearing is a ___ bearing

Answer 33

linear motion

Question 34

which linear motion bearing reduces shaft deflection?

Answer 34

open ball bushing

Question 35

bearing units designed to provide adjustment for shaft center distances are known as

Answer 35

take ups

Question 36

a major function of a bearing seal is to

Answer 36

retain lubricant

Question 37

the width of an oil seal is the

Answer 37

thickness of the outer race

Question 38

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

Answer 38

surface speed in FPM

Question 39

to ensure proper operation of a synthetic bearing seal the shaft should be

Answer 39

polished

Question 40

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

Answer 40

shaft

Question 41

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

Answer 41

light, high

Question 42

combatting the most common contamination of lubricating oils requires

Answer 42

cleaning the sump

Question 43

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

Answer 43

metal particles

Question 44

the natural lubricating grease institute specifies the hardness of a grease in numbers from ___ to ___

Answer 44

000 , 6

Question 45

when packing grease into a bearing you should fill the bearing ____ full

Answer 45

about half

Question 46

early bearing failure often results from

Answer 46

improper installations

Question 47

if ball or roller bearing are slightly misaligned when installed they will

Answer 47

fail sooner than they should

Question 48

if a newly installed bearing makes a high pitched whine when it starts running the bearing may be

Answer 48

overloaded

Question 49

excessive loading on a bearing causes

Answer 49

brinelling

Question 50

immediately after cleaning and inspecting a bearing you should coat it with

Answer 50

oil