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Question 1

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

Answer 1

Consult manufacturer’s charts and tables

Question 2

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

Answer 2

Thermal conductivity

Question 3

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

Answer 3

Conformability

Question 4

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

Answer 4

Newly applied grease forces old lubricants out

Question 5

Discoloration in plain bearings is generally a symptom of

Answer 5

Excessive heat

Question 6

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

Answer 6

Feeler gauge

Question 7

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

Answer 7

Preheating

Question 8

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

Answer 8

White lead

Question 9

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

Answer 9

Circulate lubricant

Question 10

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

Answer 10

Clearances are too tight

Question 11

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

Answer 11

Wrap it in oil-resistant paper

Question 12

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

Answer 12

Interference

Question 13

You can forco an antifriction bearing into position on the shaft by using an arbor press or by impact, it the bearing has an O.D. of

Answer 13

4 inches or less

Question 14

A bearing is driven up a split tapered adapter by

Answer 14

tightening a heavy-duty locknut

Question 15

Al approximately what temporature should you begin to suspect a bearing probiem?

Answer 15

185°F

Question 16

You clean an antifriction beanng before installation if it

Answer 16

will be lubricated by automatic oil-mist

Question 17

If the shoulder is too low when seating an antifriction beanng on the shaft the

Answer 17

Inner ring may distort

Question 18

When inspecting a tapered shaft by blueing the gauge bore, a(n) ___ % blueing transfer is acceptable

Answer 18

80

Question 19

When cold mounting an antifriction bearing, you must

Answer 19

lubricate the bearing bore and shaft with light oil

Question 20

Which of the following is not an approved way to heat a roller bearing for a temperature mount?

Answer 20

Gas operated torch

Question 21

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

Answer 21

A spanner

Question 22

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

Answer 22

Back the nut off several times

Question 23

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

Answer 23

Cylindrical roller

Question 24

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

Answer 24

500°F

Question 25

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

Answer 25

Fill it with grease

Question 26

The two main methods of removing antifriction bearings are

Answer 26

Impact and heating

Question 27

Which of the following is a correct way to remove an antifiction bearing with a diameter smaller than 4 in ?

Answer 27

Arbor press

Question 28

The two important dimensions of a bearing puller are spread and

Answer 28

Reach

Question 29

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

Answer 29

Mechanical puller

Question 30

Which of the following should not be used to clean an antifiction bearing when inspecting it?

Answer 30

Steam

Question 31

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

Answer 31

Contact seal

Question 32

Which type of antifriction bearing can tolerate the most internal misalgnment?

Answer 32

Spherical roller bearing

Question 33

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

Answer 33

-0.001 in

Question 34

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

Answer 34

Mineral oil

Question 35

As a rule, the interval between lubincation renewals is cut in half for every 27° F increase in temperature above

Answer 35

160°F

Question 36

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

Answer 36

Takeup

Question 37

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

Answer 37

No collar

Question 38

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

Answer 38

Manufacturers chart

Question 39

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

Answer 39

Grease

Question 40

Bearing temperature is typically ____ to ____°F higher than the temperature of the housing

Answer 40

15;25

Question 41

The threads of an acme screw are

Answer 41

Squared off and thick

Question 42

Ball bearing screws are designed to

Answer 42

Move loads vertically and horizontally

Question 43

The screw in a ball bearing screw is supported by

Answer 43

Standard ball bearings

Question 44

In a contact seal, what forms the actual seal?

Answer 44

A thin film of oil

Question 45

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

Answer 45

15;30

Question 46

The rolling contact of a ball bearing screw is ____ % efficient

Answer 46

90

Question 47

Which of the following carries the load moved by a ball bearing screw?

Answer 47

Ways

Question 48

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

Answer 48

Hot oil bath

Question 49

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

Answer 49

V-ring

Question 50

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

Answer 50

Silicone