1 - Sup 3 Flashcards
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
E) They have low starting friction
page 9
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
B) Radial loads and moderate thrust loads
page 12
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
D) Moderate combined thrust and radial loads
page 12
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
FALSE
page 14
The only difference between a heavy duty bearing and a light duty bearing is the size of the balls
True or False
FALSE
page 16
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
D) Wash out completely, all grease in which a bearing comes packed
page 23
Pressure should always be applied to the outer race when removing a ball bearing from a shaft.
True or False
FALSE
page 27
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
A) would disassemble
*it would disassemble the bearing and brinell and ruin the race
page 30
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
B) Maintain a constant steady pull
*be sure the pull is steady and applied all around the outer ring
page 31
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
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
Sometimes the inner bearing cap can be used to pull a bearing.
True or False
TRUE
page 38
A three way puller is particularly useful in pulling:
A) roller bearings
B) gears through the spokes
C) needle bearings
D) deep groove bearings
B) Gears through the spokes
page 42
It is a good idea to smooth off a shaft with emery cloth before mounting a ball bearing.
True or False
FALSE
page 46
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
D) 1/2
page 47
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
C) 225° F
page 54
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
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
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
FALSE
page 55
Face to face mounting of duplex bearings allows a moderate amount of misalignment
True or False
TRUE
page 59
Tandem mounting of duplex bearings is used for heavy radial loads
True or False
FALSE
page 61
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
FALSE
page ?
The wiping lip of a seal should usually be turned toward the inside of the housing.
True or False
TRUE
page 77
Oil lubrication will permit about ______ the bearing speed of grease lubrication.
A) three times
B) one-half
C) twice
D) two-thirds
C) Twice
page 82
The main advantage of oil lubrication over grease lubrication is its ability to circulate and cool the bearing
True or False
TRUE
page 82
About how full should a bearing housing be filled with grease
A) 1/3
B) 1/2
C) 3/4
D) 2/3
D) 1/3
page 83
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
B) Over heating
page 83
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
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
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
B) A definitively defined load track on opposite sides of the outer race diagonally across
page 94
A cracked inner race may mean that the shaft is oversized
True or False
TRUE
page ?
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
A) Use cotton waste to wipe bearings
page 99
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
D) To cover the bottom half of the bottom ball
page 103
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”
A) .001” to .003”
page 109
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
FALSE
page 111
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
D) Tin, copper, and antimony
page 112
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
A) The spring type and C) the tilting shoe type
page 122
The G.E. Type generator thrust bearing obtains its equalizing action from springs under the stationary segments.
True or False
TRUE
page 126
The protective material on the bearing surfaces of a G.E.type generator thrust bearing should not be removed
True or False
FALSE
page 129
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
FALSE
page 132
A Kingsbury thrust bearing is said to be “equalizing” if the load on the shoes is adjusted automatically
True or False
TRUE
page 133
The principle behind the load carrying capacity of the Kingsbury type bearing is the formation of a wedge shaped oil film
True or False
TRUE
page 131
The main advantage of calcium base grease is its water resistance
True or False
TRUE
page 156
A trimetal bearing consists of a thin overlay of Babbitt on a leaded bronze lining on a steal back
True or False
TRUE
page 143
Turbine oil stability is its ability to resist foaming
True or False
FALSE
page 150
Viscosity index is a measure of an oils rate of viscosity with temperature
True or False
TRUE
page 151
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
D) Carry oil to the bearing from the reservoir
page 162
