# 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

Explanation: There is no contact between the two surfaces.

2 - Question

Hydrodynamic bearing is a self-acting bearing.

a) True
b) False

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
d) Rolling, Axial

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

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

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

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

Explanation: To provide space for lubricating oil.

8 - Question

Footstep bearing is an axial load bearing.

a) True
d) None of the listed

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

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

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