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

Correct Answer: There is a thick film of lubricant between the journal and the bearing

Bissoy MCQ
#Mechanical Engineering #Machine Design

Related Questions

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
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
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
A Remains constant at all speeds
B Is minimum at zero speed and increases monotonically with increase in speed
C Is maximum at zero speed and decreases monotonically with increase in speed
D Becomes minimum at an optimum speed and then increases with further increase in speed
The bearing characteristic number in a hydrodynamic bearing depends upon
A Length, width and load
B Length, width and speed
C Viscosity, speed and load
D Viscosity, speed and bearing pressure
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
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
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 $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
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 $$-1$$

Next steps