MCQs on Sliding Contact Bearings
1 - Question
Thick film lubrication describes a phenomenon where two surfaces are _______ separated.
a) Completely
b) Partially
c) Not
d) None of the mentioned
View Answer
Answer: a
Explanation: There is no contact between the two surfaces.
2 - Question
Hydrodynamic bearing is a self-acting bearing.
a) True
b) False
View Answer
Answer: a
Explanation: The pressure in the bearing is created within the system due to rotation of the shaft.
3 - Question
A journal bearing is a ______ contact bearing working on the hydrodynamic lubrication and which supports load in____ direction.
a) Sliding, Axial
b) Rolling, Radial
c) Sliding, Radial
d) Rolling, Axial
View Answer
Answer: c
Explanation: This is how journal bearing works. It derives its name from the portion of the shaft inside the bearing.
4 - Question
Partial bearing is preferred over journal bearing.
a) True
b) No
c) More friction losses
d) Can’t be determined
View Answer
Answer: a
Explanation: Friction losses are lesser and construction is simple.
5 - Question
Temperature rise in partial bearing is ____ than full bearing.
a) Lesser
b) Greater
c) Equal
d) Undeterminable
View Answer
Answer: a
Explanation: Due to lesser friction, temperature rise is less.
6 - Question
A clearance bearing is design accurately to keep the radius of journal and bearing equal.
a) Journal radius is kept larger
b) Journal radius is kept smaller
c) True
d) Can’t be determined
View Answer
Answer: b
Explanation: Journal radius is kept smaller.
7 - Question
Fitted bearing must be partial bearing.
a) True
b) No
c) No lubricating space is required
d) Can’t be stated
View Answer
Answer: a
Explanation: To provide space for lubricating oil.
8 - Question
Footstep bearing is an axial load bearing.
a) True
b) Thrust load
c) Shear load
d) None of the listed
View Answer
Answer: b
Explanation: It is a thrust bearing in which shaft end is in contact with bearing surface.
9 - Question
Hydrostatic and hydrodynamic lubrication are the same thing.
a) True
b) False
View Answer
Answer: b
Explanation: In hydrodynamic, motion is provided by the shaft while in hydrostatic the motion is provided by an external source.
10 - Question
If we exclude the cost factor, which bearing is preferred?
a) Hydrostatic
b) Hydrodynamic
c) Both are equally preferred
d) Cannot be determined
View Answer
Answer: a
Explanation: High load capacity, no starting friction and no rubbing action.
11 - Question
If fluid film pressure is high and surface rigidity is low than mode of lubrication is called as elastohydrodynamic lubrication.
a) True
b) False
View Answer
Answer: a
Explanation: In such cases, elastic deflections of the parts causes development of the film.