4B Power Engineering:302 Unit
1 - Lubrication and Bearings
Revision Questions
When replacing or removing an antifriction ball bearing, the applied
force should:
Select one:
a. only be applied to the press fit race
b. always be against the inner race
c. always be against the outer race
d. be made only after heating the bearing - ✔ ✔ a
Whenever feasibly possible, when checking bearings on running
pieces of equipment, it is wise to:
Select one:
a. check the oil quality leaving each bearing
b. smell the normal odours of the running bearing
c. get accustomed to normal running temperature and vibration by
feel
d. observe the normal running temperature on a thermometer
e. check the oil quality in the lube oil storage tank - ✔ ✔ c
Which class of liquid lubricant is most commonly used?:
Select one:
,a. plant-based oils
b. multi-purpose greases
c. animal-based oils
d. mineral oils - ✔ ✔ d
Grease is not a suitable lubricant:
Choose one answer.
a. If the atmosphere contains a lot of moisture
b. When the atmosphere is dusty
c. If corrosion protection is desired during downtime
d. In the food industry
e. If a large amount of cooling is desired - ✔ ✔ e
Grease is not a suitable lubricant:
Select one:
a. If the atmosphere contains a lot of moisture
b. When the atmosphere is dusty
c. If corrosion protection is desired during downtime
d. If a large amount of cooling is desired - ✔ ✔ d
Grease is the preferred bearing lubricant when speeds are moderate
and:
Select one:
a. wear must be reduced
b. the bearing must be sealed against atmospheric contaminants
,c. the lubricant must be continually replaced
d. cooling is a high priority - ✔ ✔ b
Why are oil grooves not located in the pressure zone of a shell
bearing?:Select one:
a. the grooves can erode in this area
b. the grooves must align with the oil delivery port
c. the pressure is too high in the pressure zone to enable effective
lubrication
d. grooves in this area can disrupt the oil film and cause damage -
✔ ✔ d
Why arenʼt oil grooves located in the pressure zone of a shell
bearing?:
Select one:
a. the grooves can erode in this area
b. the grooves must align with the oil delivery port
c. the pressure is too high in the pressure zone to enable effective
lubrication
d. grooves in this area can disrupt the oil film and cause damage -
✔ ✔ d
Why is Babbitt such a good metal to use in shell bearings?
Select one:
a. it is cheap
b. it is hard wearing
c. it will deform slightly
, d. it rejects foreign particles - ✔ ✔ c
4B01-02-02-06 The groove that is cut in the top half in the lining of
a shell bearing should not extend closer to the ends than:
Select one:
a. 3 mm
b. 10 mm
c. 1.25 cm
d. 1.7 cm - ✔ ✔ C
A collar thrust bearing:
1. Can support more load than a Michell thrust bearing
2. Can prevent a rotating shaft from moving in an axial direction
3. Has boundary lubrication
4. Is an antifriction type bearing
a. 1, 2, 3
b. 1,2,4
c. 2,3
d. 3,4
e. 1,2,3,4. - ✔ ✔ C
A common cause of antifriction bearing failure is:
Select one:
a. Shaft misalignment
b. Drive motor overload
1 - Lubrication and Bearings
Revision Questions
When replacing or removing an antifriction ball bearing, the applied
force should:
Select one:
a. only be applied to the press fit race
b. always be against the inner race
c. always be against the outer race
d. be made only after heating the bearing - ✔ ✔ a
Whenever feasibly possible, when checking bearings on running
pieces of equipment, it is wise to:
Select one:
a. check the oil quality leaving each bearing
b. smell the normal odours of the running bearing
c. get accustomed to normal running temperature and vibration by
feel
d. observe the normal running temperature on a thermometer
e. check the oil quality in the lube oil storage tank - ✔ ✔ c
Which class of liquid lubricant is most commonly used?:
Select one:
,a. plant-based oils
b. multi-purpose greases
c. animal-based oils
d. mineral oils - ✔ ✔ d
Grease is not a suitable lubricant:
Choose one answer.
a. If the atmosphere contains a lot of moisture
b. When the atmosphere is dusty
c. If corrosion protection is desired during downtime
d. In the food industry
e. If a large amount of cooling is desired - ✔ ✔ e
Grease is not a suitable lubricant:
Select one:
a. If the atmosphere contains a lot of moisture
b. When the atmosphere is dusty
c. If corrosion protection is desired during downtime
d. If a large amount of cooling is desired - ✔ ✔ d
Grease is the preferred bearing lubricant when speeds are moderate
and:
Select one:
a. wear must be reduced
b. the bearing must be sealed against atmospheric contaminants
,c. the lubricant must be continually replaced
d. cooling is a high priority - ✔ ✔ b
Why are oil grooves not located in the pressure zone of a shell
bearing?:Select one:
a. the grooves can erode in this area
b. the grooves must align with the oil delivery port
c. the pressure is too high in the pressure zone to enable effective
lubrication
d. grooves in this area can disrupt the oil film and cause damage -
✔ ✔ d
Why arenʼt oil grooves located in the pressure zone of a shell
bearing?:
Select one:
a. the grooves can erode in this area
b. the grooves must align with the oil delivery port
c. the pressure is too high in the pressure zone to enable effective
lubrication
d. grooves in this area can disrupt the oil film and cause damage -
✔ ✔ d
Why is Babbitt such a good metal to use in shell bearings?
Select one:
a. it is cheap
b. it is hard wearing
c. it will deform slightly
, d. it rejects foreign particles - ✔ ✔ c
4B01-02-02-06 The groove that is cut in the top half in the lining of
a shell bearing should not extend closer to the ends than:
Select one:
a. 3 mm
b. 10 mm
c. 1.25 cm
d. 1.7 cm - ✔ ✔ C
A collar thrust bearing:
1. Can support more load than a Michell thrust bearing
2. Can prevent a rotating shaft from moving in an axial direction
3. Has boundary lubrication
4. Is an antifriction type bearing
a. 1, 2, 3
b. 1,2,4
c. 2,3
d. 3,4
e. 1,2,3,4. - ✔ ✔ C
A common cause of antifriction bearing failure is:
Select one:
a. Shaft misalignment
b. Drive motor overload
