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WorksheetsRoller bearings - basics
Total questions: 25
Worksheet time: 13mins
In radial bearings, the load acts
along the axis of rotation
perpendicular to the axis of rotation
parallel to the axis of rotation
a and c
In thrust bearings, the load acts
a.) along the axis of rotation
b.) perpendicular to the axis of rotation
c.) parallel to the axis of rotation
a and c
Antifriction bearings are
oil lubricated bearings
bush bearings
ball and roller bearings
boundary lubricated bearings
Rolling contact bearings as compared to sliding contact bearings have
lower starting torque
require considerable axial space
generate less noise
high friction
A bearing number XX10 indicates that the bearing is having
bore diameter of 10 mm
bore diameter of 100 mm
bore diameter of 50 mm
outer diameter of 100 mm
A bearing is designated by the number 410. It means that it is a bearing of
light series with bore diameter of 10 mm
heavy series with bore diameter of 50 mm
medium series with bore diameter of 50 mm
light series with bore diameter of 50 mm
Stress induced in the balls or rollers of rolling contact bearing is
torsional shear stress
tensile stress
crushing stress
contact stress
In an application, the bearing is subjected to radial as well as axial loads. Which type of rolling contact bearings you would suggest?
cylindrical roller bearing
needle roller bearing
thrust ball bearing
taper roller bearing
In an application, the bearing is subjected to radial as well as axial loads. Which type of rolling contact bearings you would suggest?
angular contact bearing
spherical roller bearing
taper roller bearing
any one of above three types
The rolling contact bearing is known as
sleeve bearing
thin film bearing
antifriction bearing
bush bearing
The balls of rolling contact bearings are made of
case hardened steel
plain carbon steel
high carbon chromium steel
free cutting steel
The rollers of rolling contact bearings are made of
case hardened steel
plain carbon steel
high carbon chromium steel
free cutting steel
The medium series bearings have ……… higher load carrying capacity than light series bearing of the same bore diameter.
30 to 40 per cent
20 to 30 per cent
40 to 50 per cent
10 to 20 per cent
The heavy series bearings have ………higher load carrying capacity than medium series bearing of the same bore diameter.
30 to 40 per cent
20 to 30 per cent
40 to 50 per cent
10 to 20 per cent
Taper roller bearing is used to take
only radial load
only axial load
only torque
both axial and radial loads
The catalogue life of bearing is
minimum life that 90% of the bearings will reach or exceed
maximum life for 90% of the bearings
average life
median life
The last two digits of the bearing designation give the bore diameter of rolling contact bearings when multiplies by,
10
5
100
π
Rolling contact bearings are classified according to
a.) type of rolling element
b.) direction of load
c.) magnitude of load
a and b
In an application, there is misalignment between the axes of journal and housing bore. Which type of rolling contact bearings you would suggest?
a.) spherical roller bearing
b.) self aligning ball bearing
c.) angular contact bearing
a and b
Ball and roller bearings in comparison to sliding bearings have
more accuracy in alignment
low starting and running friction
small overall dimensions
all of these
A bearing is designated by the number 405. It means that a bearing is of
light series with bore of 5 mm
medium series with bore of 15 mm
light series with width of 20 mm
heavy series with bore of 25 mm
The listed life of a rolling bearing, in a catalogue, is the
minimum expected life
average life
maximum expected life
none of these
Identify the type of bearing and the find the diameter
Taper roller bearing, dia = 45mm
Needle bearing, dia = 30mm
roller bearing, dia = 90 mm
journal bearing, dia = 30mm
A typical ceiling fan bearing is shown, identify the bearing number, type of bearing and the diameter.
6201 - 2z, deep grove ball bearing, dia = 12mm
6201 - 2z, Roller bearing, dia = 5mm
6201 - 2z, Needle bearing, dia = 12mm
6201 - 2z, Thrust ball bearing, dia = 12mm
A typical bearing used in a revolving chair is shwon. identify the bearing number, type of the bearing and diameter.
51103, thrust ball bearing, dia = 17mm
51103, deep grove ball bearing, dia = 17mm
51103, thrust ball bearing, dia = 51 mm
51103, needle bearing, dia = 17mm
