Related Questions

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
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 $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
In a hydrodynamic journal bearing, there is
A A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
B A thick film of lubricant between the journal and the bearing
C No lubricant between the journal and the bearing
D A forced lubricant between the journal and the bearing
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
A 0.01 micron
B 0.1 micron
C 1 micron
D 10 microns
In a hydrodynamic lubricated bearing
A There is a thick film of lubricant between the journal and the bearing
B There is a thin film of lubricant between the journal and the bearing
C The lubricant is forced between the journal and the bearing, by external pressure
D There is no lubricant between the journal and the bearing
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
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
A Magnitude of the forces on journal
B Angular velocity of journal
C Clearance between journal and bearing
D Radius of journal
Allowable bearing pressure for a foundation depends upon
A allowable settlement only
B ultimate bearing capacity of soil only
C both allowable settlement and ultimate bearing capacity
D none of above
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to
A $$ - \frac{1}{3}$$
B $$ - \frac{2}{3}$$
C 1
D $$-1$$
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
A Equal to one
B Greater than one
C Less than one
D Equal to Nusselt number

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