CHAPTER 31 Flashcards
(25 cards)
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
A.
The force applied indenting or nicking the balls or rollers
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
A.
Loss of bearing metal due to corrosion or metal fatigue
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
C.
Hard pieces of lubricant being pressed into the bearing surfaces producing flaking and pitting
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
C.
Improper bearing design
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
B.
The softening of the metal
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
B.
Where the surfaces are separated by only a microscopic film of the lubricant
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
C.
The collars function like a tilting pad
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
A.
Improper viscosity of oil
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)
A.
120°C (248°F)
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
C.
Uneven loading of the bearing
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
D.
Journals
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
A.
Temperature of oil too high
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
D.
The pads are free to tilt
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
C.
After removing the end covers, a solvent can be sprayed into the end cover to flush out old lubricant and sludge
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
D.
Loss of oil supply
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
E.
Races
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
A.
Prevent a rotating shaft from moving in an axial direction
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
C.
Needle
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
E.
White-metal alloy
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
C.
Film between surfaces is thick enough to completely separate the surfaces
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
C.
Comparative softness allows it to “wear in” to a smooth condition
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
E.
Shell
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
A.
A rise in its operating temperature
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
E.
Misalignment of shaft and bearing
