1 - Sup 3

Question 1

The main advantage of ball and roller bearings is:

A) They are easy to replace

B) They can carry heavy loads

C) They last longer

D) Journel Bearings are old fashioned

E) They have low starting friction

Answer 1

E) They have low starting friction

page 9

Question 2

Deep groove ball bearings are designed for:

A) heavy thrust loads

B) radial loads and moderate thrust loads

C) heavy radial loads only

D) light radial loads only

E) light trust loads only

Answer 2

B) Radial loads and moderate thrust loads

page 12

Question 3

Angular contact ball bearings are designed for:

A) heavy thrust loads

B) light radial loads

C) heavy radial loads

D) moderate combined thrust and radial loads

Answer 3

D) Moderate combined thrust and radial loads

page 12

Question 4

Deep groove ball bearings can carry heavier radial loads than radial bearings with filling slots because the deep groove bearing has more balls

True or False

Answer 4

FALSE

page 14

Question 5

The only difference between a heavy duty bearing and a light duty bearing is the size of the balls

True or False

Answer 5

FALSE

page 16

Question 6

When handling bearings which of the following should not be done?

A) use clean newspapers on which to lag bearings while installing

B) use plenty of clean rags

C) leave bearings in box until ready to use

D) wash out completely, all grease in which a bearing comes packed

Answer 6

D) Wash out completely, all grease in which a bearing comes packed

page 23

Question 7

Pressure should always be applied to the outer race when removing a ball bearing from a shaft.

True or False

Answer 7

FALSE

page 27

Question 8

What would happen if you attempted to pull a bearing on the shallow shoulder of an angular contact bearing?

A) would disassemble

B) would not disassemble

C) nothing would happen

D) none of the above

Answer 8

A) would disassemble

*it would disassemble the bearing and brinell and ruin the race

page 30

Question 9

When a bearing must be pulled by the outer race because of a gear or shaft shoulder, what is the most important thing to remember?

A) don’t maintain pressure

B) maintain a constant steady pull

C) communication

D) all of the above

Answer 9

B) Maintain a constant steady pull

*be sure the pull is steady and applied all around the outer ring

page 31

Question 10

Why shouldn’t galvanized pipe be used as a drift to remove bearings?

A) particles of zinc can chip off into the bearing

B) reduce friction

C) excess vibration

D) none of the above

Answer 10

A) Particles of zinc can chip off into the bearing

*the zinc on the galvanized pipe chips off and is liable to get into the bearing

page 32

Question 11

Sometimes the inner bearing cap can be used to pull a bearing.

True or False

Answer 11

TRUE

page 38

Question 12

A three way puller is particularly useful in pulling:

A) roller bearings

B) gears through the spokes

C) needle bearings

D) deep groove bearings

Answer 12

B) Gears through the spokes

page 42

Question 13

It is a good idea to smooth off a shaft with emery cloth before mounting a ball bearing.

True or False

Answer 13

FALSE

page 46

Question 14

A shaft shoulder for a bearing should be about ____ the height of the inner race.

A) 1/3

B) 1/4

C) 1/8

D) 1/2

Answer 14

D) 1/2

page 47

Question 15

What should be the maximum temperature used to heat a bearing on a shaft?

A) 300° F

B) 180° F

C) 225° F

D) 400° F

Answer 15

C) 225° F

page 54

Question 16

What will happen if a ball bearing is fit loosely on a shaft?

A) nothing will happen

B) just keep working

C) inner ring will slip and rotate on shaft

D) none of the above

Answer 16

C) Inner ring will slip and rotate on shaft

*with shaft rotation the inner ring would slip back one complete revolution in every 1000. The slippage causes continuous wear

page 56

Question 17

A ball or roller bearing should be fit onto the shaft as tightly as possible to prevent rotation of the inner race.

True or False

Answer 17

FALSE

page 55

Question 18

Face to face mounting of duplex bearings allows a moderate amount of misalignment

True or False

Answer 18

TRUE

page 59

Question 19

Tandem mounting of duplex bearings is used for heavy radial loads

True or False

Answer 19

FALSE

page 61

Question 20

If one bearing in a duplex set is bad it is permissible to replace the bad bearing as long as it is replaced by one made by the same manufacturer.

True or False

Answer 20

FALSE

page ?

Question 21

The wiping lip of a seal should usually be turned toward the inside of the housing.

True or False

Answer 21

TRUE

page 77

Question 22

Oil lubrication will permit about ______ the bearing speed of grease lubrication.

A) three times

B) one-half

C) twice

D) two-thirds

Answer 22

C) Twice

page 82

Question 23

The main advantage of oil lubrication over grease lubrication is its ability to circulate and cool the bearing

True or False

Answer 23

TRUE

page 82

Question 24

About how full should a bearing housing be filled with grease

A) 1/3

B) 1/2

C) 3/4

D) 2/3

Answer 24

D) 1/3

page 83

Question 25

What is the main detrimental affect of over lubrication in a grease lubricating bearing? A) excessive vibration B) over heating C) nothing will happen D) none of the above

Answer 25

B) Over heating page 83

Question 26

What is the best method of removing grease from an over lubricated bearing while it is in service? A) just remove the drain plug B) wait until alarm comes in C) remove the drain plug and leave out for 15-20 minutes D) all of the above

Answer 26

C) Remove the drain plug and leave out for 15-20 minutes \*remove the drain plug and leave it ot until the excess grease is expelled page 83

Question 27

Ball or roller bearings which have failed because they have been pinched in the housing can be recognized by: A) putting on the races with brown discoloration B) A definitively defined load track on opposite sides of the outer race diagonally across C) excessive wear of the bearing cage D) false brinelling in the inner and outer races

Answer 27

B) A definitively defined load track on opposite sides of the outer race diagonally across page 94

Question 28

A cracked inner race may mean that the shaft is oversized True or False

Answer 28

TRUE page ?

Question 29

Which one of the following should not be done in working with anti-friction bearings? A) use cotton waste to wipe bearings B) treat a used bearing as carefully as a new one C) use lint-free rags to wipe bearing D) wash bearing with solvent

Answer 29

A) Use cotton waste to wipe bearings page 99

Question 30

The oil reservoir of an anti friction bearing is usually filled: A) to cover the bottom half of the top ball B) one-third full C) to the middle of the split line D) to cover the bottom half of the bottom ball

Answer 30

D) To cover the bottom half of the bottom ball page 103

Question 31

The lubricating oil film in a sleeve bearing is about _______ thick A) .001" to .003" B) .003" to .005" C) .004" to .006" D) .008" to .010"

Answer 31

A) .001" to .003" page 109

Question 32

If you are looking at the end of a shaft turning counter-clockwise, the shaft will tend to assume a position to the left of the centerline on a journal bearing when the oil film is fully established True or False

Answer 32

FALSE page 111

Question 33

In 1839, Mr. Babbit devised a material for sleeve bearing which consisted of: A) copper, lead & zinc B) lead, iron & tin C) zinc, chrome & tantalam D) tin, copper & antimony

Answer 33

D) Tin, copper, and antimony page 112

Question 34

The two types of thrust bearings in general use on hydroelectric units are: A) the spring type B) the hydrodynamic type C) the tilting shoe type D) the hydrostatic type E) the univeral type

Answer 34

A) The spring type and C) the tilting shoe type page 122

Question 35

The G.E. Type generator thrust bearing obtains its equalizing action from springs under the stationary segments. True or False

Answer 35

TRUE page 126

Question 36

The protective material on the bearing surfaces of a G.E.type generator thrust bearing should not be removed True or False

Answer 36

FALSE page 129

Question 37

The basic elements of a Kingsbury thrust bearing are a rotating thrust collar, stationary tilting shoes, base ring, housings, lubricating system, cooling system and equalizing springs True or False

Answer 37

FALSE page 132

Question 38

A Kingsbury thrust bearing is said to be "equalizing" if the load on the shoes is adjusted automatically True or False

Answer 38

TRUE page 133

Question 39

The principle behind the load carrying capacity of the Kingsbury type bearing is the formation of a wedge shaped oil film True or False

Answer 39

TRUE page 131

Question 40

The main advantage of calcium base grease is its water resistance True or False

Answer 40

TRUE page 156

Question 41

A trimetal bearing consists of a thin overlay of Babbitt on a leaded bronze lining on a steal back True or False

Answer 41

TRUE page 143

Question 42

Turbine oil stability is its ability to resist foaming True or False

Answer 42

FALSE page 150

Question 43

Viscosity index is a measure of an oils rate of viscosity with temperature True or False

Answer 43

TRUE page 151

Question 44

The purpose of an oil ring in an oil lubricated oil bearing is to: A) prevent leakage of oil from the ends of the bearing B) prevent leakage along the shaft C) prevent leakage from the housing D) carry oil to the bearing from the reservoir

Answer 44

D) Carry oil to the bearing from the reservoir page 162