Related Questions

A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.
A Partially
B Fully
C Either A or B
D None of these
If p = bearing pressure on projected bearing area, Z = absolute viscosity of lubricant and N = speed of journal, then the bearing characteristic number is given by
A $$\frac{{{\text{ZN}}}}{{\text{p}}}$$
B $$\frac{{\text{p}}}{{{\text{ZN}}}}$$
C $$\frac{{\text{Z}}}{{{\text{pN}}}}$$
D $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called
A Hydrostatic lubricated bearing
B Hydrodynamic lubricated bearing
C Boundary lubricated bearing
D Zero film bearing
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.
A Thick film
B Thin film
C Either A or B
D None of these
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when
A Wheel base of axles is more
B Degree of curvature is more
C Both (A) and (B)
D None of the above
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing and R = Radius of bearing surface)
A $$\frac{1}{2}$$μWR
B $$\frac{2}{3}$$μWR
C $$\frac{3}{4}$$μWR
D μWR
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.
A 10 times
B 5 times
C 15 times
D 20 times
Lubricant used for ball bearing is usually
A Graphite
B Grease
C Mineral oil
D Molasses
The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as
A Bondability
B Embeddability
C Comformability
D Fatigue strength
In the plate loading test for determining the bearing capacity of soil, the size of square bearing plate should be
A less than 300 mm
B between 300 mm and 750 mm
C between 750 mm and 1 m
D greater than 1 m

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