CHAPTER 31

Question 1

Improper fitting can cause premature bearing failure due to:
Select one:

A.
The force applied indenting or nicking the balls or rollers

B.
Cracking of the rollers

C.
High operating temperatures

D.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting

E.
Uneven loading of the bearing

Answer 1

A.
The force applied indenting or nicking the balls or rollers

Question 1

Usually the cause of the bearing trouble is one of the following:
Select one:

A.
Loss of bearing metal due to corrosion or metal fatigue

B.
Excessive oil supply

C.
Proper bearing design

D.
True alignment of shaft and bearing

E.
Proper viscosity of oil

Answer 1

A.
Loss of bearing metal due to corrosion or metal fatigue

Question 2

A poor quality lubricant can cause premature bearing failure due to:
Select one:

A.
Cracking or splitting of the bearing race

B.
Indentations in the surfaces in contact with the balls or rollers

C.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting

D.
Uneven loading of the bearing

E.
High operating temperatures

Answer 2

C.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting

Question 3

Usually the cause of the bearing trouble is one of the following:
Select one:

A.
Temperature of oil too low

B.
True alignment of shaft and bearing

C.
Improper bearing design

D.
Excessive oil supply

E.
Proper viscosity of oil

Answer 3

C.
Improper bearing design

Question 4

High operating temperatures can cause premature bearing failure due to:
Select one:

A.
Excessive vibrations

B.
The softening of the metal

C.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting

D.
Cracking or splitting of the bearing race

E.
Uneven loading of the bearing

Answer 4

B.
The softening of the metal

Question 5

Boundary lubrication refers to lubrication:
Select one:

A.
Where the bearing clearance space is flooded with oil

B.
Where the surfaces are separated by only a microscopic film of the lubricant

C.
There is no metal to metal contact between the surfaces

D.
When the lubricating film between surfaces is thick enough to completely separate the surfaces

E.
When the supply of lubricant is steady and unrestricted

Answer 5

B.
Where the surfaces are separated by only a microscopic film of the lubricant

Question 6

Which statement is NOT correct about a simple type of thrust bearing known as a collar thrust bearing?
Select one:

A.
The collars have their complete area pressing against the bearing surface

B.
This bearing can only carry a limited load

C.
The collars function like a tilting pad

D.
There is no room for an oil wedge to be formed

E.
The collars are an integral part of the shaft

Answer 6

C.
The collars function like a tilting pad

Question 7

Usually the cause of the bearing trouble is one of the following:
Select one:

A.
Improper viscosity of oil

B.
Proper bearing design

C.
True alignment of shaft and bearing

D.
Excessive oil supply

E.
Temperature of oil too low

Answer 7

A.
Improper viscosity of oil

Question 8

Bearings can withstand operating temperatures up to:
Select one:

A.
120°C (248°F)

B.
85°C (185°F)

C.
150°C (302°F)

D.
200°C (392°F)

E.
90°C (194°F)

Answer 8

A.
120°C (248°F)

Question 8

Misalignment can cause premature bearing failure due to:
Select one:

A.
High operating temperatures

B.
Indentations in the surfaces in contact with the balls or rollers

C.
Uneven loading of the bearing

D.
Cracking or splitting of the bearing race

E.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting

Answer 8

C.
Uneven loading of the bearing

Question 9

The moving or rolling members of anti-friction bearings can be all except:
Select one:

A.
Balls

B.
Barrel rollers

C.
Parallel rollers

D.
Journals

E.
Tapered rollers

Answer 9

D.
Journals

Question 10

Usually the cause of the bearing trouble is one of the following:
Select one:

A.
Temperature of oil too high

B.
Excessive oil supply

C.
Proper viscosity of oil

D.
True alignment of shaft and bearing

E.
Proper bearing design

Answer 10

A.
Temperature of oil too high

Question 11

A more suitable design of thrust bearing has the bearing surfaces in the form of pads, in which
Select one:

A.
The pads press against each other in opposite directions

B.
there is no room for an oil wedge to form

C.
the thrust collar tilts against against a stationary surface

D.
The pads are free to tilt

E.
the thrust collar does not revolve

Answer 11

D.
The pads are free to tilt

Question 12

All of the following are steps in a procedure for cleaning a bearing without dismantling it except:
Select one:

A.
Make sure all dirt has been removed from the outside of the bearing and the surrounding parts

B.
The bearing refilled with the normal lubricant, either oil or grease as the case may be

C.
After removing the end covers, a solvent can be sprayed into the end cover to flush out old lubricant and sludge

D.
The end covers are replaced

E.
Then a light lubricating oil is sprayed into the bearing

Answer 12

C.
After removing the end covers, a solvent can be sprayed into the end cover to flush out old lubricant and sludge

Question 13

Usually the cause of the bearing trouble is one of the following:
Select one:

A.
Proper bearing design

B.
True alignment of shaft and bearing

C.
Temperature of oil too low

D.
Loss of oil supply

E.
Proper viscosity of oil

Answer 13

D.
Loss of oil supply

Question 14

Anti-friction bearings consist of moving components which “roll” between two surfaces called:
Select one:

A.
Sleeves

B.
Tracks

C.
Grooves

D.
Valleys

E.
Races

Answer 14

E.
Races

Question 15

The purpose of a thrust bearing is to:
Select one:

A.
Prevent a rotating shaft from moving in an axial direction

B.
Prevent a stationary shaft from moving in a radial direction

C.
Allow a rotating shaft to move in an axial direction

D.
Prevent a rotating shaft from moving in a radial direction

E.
Allow a rotating shaft to move in a radial direction

Answer 15

A.
Prevent a rotating shaft from moving in an axial direction

Question 16

If the parallel rollers are quite long, the common term for these is _____ bearings.
Select one:

A.
Shell

B.
Pin

C.
Needle

D.
Sleeve

E.
Journal

Answer 16

C.
Needle

Question 17

Shell, sleeve or journal bearings are usually constructed with a _____ lining, commonly called Babbitt, carried on a cast iron or steel housing.
Select one:

A.
Aluminum-metal alloy

B.
Bronze-metal alloy

C.
Brass-metal alloy

D.
Lead-metal alloy

E.
White-metal alloy

Answer 17

E.
White-metal alloy

Question 18

Fluid film lubrication, also called flood lubrication, occurs when the lubrication:
Select one:

A.
Allows a certain amount of metal to metal contact between the surfaces

B.
Supply is restricted or intermittent

C.
Film between surfaces is thick enough to completely separate the surfaces

D.
Where the surfaces are separated by only a microscopic film of the lubricant

E.
wets the surfaces forming a microscopic film reducing friction and wear

Answer 18

C.
Film between surfaces is thick enough to completely separate the surfaces

Question 19

The Babbitt is suitable for the lining because it:
Select one:

A.
Allows scoring of the shaft

B.
Will not yield or deform to load condition

C.
Comparative softness allows it to “wear in” to a smooth condition

D.
Is hard enough to allow foreign particles to become embedded

E.
Is very easily corroded

Answer 19

C.
Comparative softness allows it to “wear in” to a smooth condition

Question 20

If the bearing can be easily replaced, such as in a car engine, it is termed a _____ type.
Select one:

A.
Journal

B.
Sleeve

C.
Ball

D.
Roller

E.
Shell

Answer 20

E.
Shell

Question 21

One of the first signs of a failing bearing is:
Select one:

A.
A rise in its operating temperature

B.
Knocking

C.
Unusual noises

D.
A drop in oil pressure

E.
A drop in its operating temperature

Answer 21

A.
A rise in its operating temperature

Question 22

Usually the cause of the bearing trouble is one of the following:
Select one:

A.
Proper bearing design

B.
Excessive oil supply

C.
Proper viscosity of oil

D.
Temperature of oil too low

E.
Misalignment of shaft and bearing

Answer 22

E.
Misalignment of shaft and bearing

Question 23

False brinelling can cause premature bearing failure due to:
Select one:

A.
Uneven loading of the bearing

B.
Excessive vibrations

C.
Cracking or splitting of the bearing race

D.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting

E.
Indentations in the surfaces in contact with the balls or rollers

Answer 23

B.
Excessive vibrations