TPC Bearings

Question 1

Anti-friction bearings are used to where

Answer 1

Low starting friction is required

Question 2

What kind of bearing can support an axial load?

Answer 2

Thrust bearings

Question 3

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

Answer 3

Bending

Question 4

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

Answer 4

Vibration becomes uncontrollable

Question 5

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

Answer 5

Running and sliding ; force

Question 6

To distribute lubricant ,plain journal bearings may have?

Answer 6

Axial and circumferential grooves

Question 7

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

Answer 7

Bearing seals

Question 8

Split bearing may be either ___or ____

Answer 8

Split-sleeve , precision insert

Question 9

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

Answer 9

Anti-friction material

Question 10

The extra lining material extending beyond half a circle and 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 500F?

Answer 13

Aluminum - bronze alloys

Question 14

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

Answer 14

Two

Question 15

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.

Answer 15

Twice ; one-third

Question 16

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

Answer 16

Cage

Question 17

Antifriction bearing the runs 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, bothering 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 bearing

Answer 20

Radial

Question 21

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

Answer 21

Fatigue ; rolling elements

Question 22

Misalignment and excessive run out 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 moves

Answer 23

Axially

Question 24

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

Answer 24

Thrust

Question 25

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

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

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

Answer 28

Cylindrical

Question 29

What kind of loads can a spherical roller bearing support?

Answer 29

Both axial and radial

Question 30

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

Answer 30

Cup

Question 31

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

Answer 31

Tapered -roller

Question 32

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

Answer 32

Spherical roller

Question 33

A ladder bearing is a ____ bearing.

Answer 33

Linear motion

Question 34

What linear-motion bearing reduces shaft deflection?

Answer 34

Open ball bushing

Question 35

Bearing units designed to provide adjustment for the 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 case

Question 38

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

Answer 38

Surface speed (in fpm)

Question 39

To insure 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 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

Combating, the most common contamination of lubrication oil 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 national 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 installation

Question 47

If a ball or roller bearings or 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