Related Questions

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
In a journal bearing, the load on the bearing is __________ to the axis of the journal.
A Parallel
B Perpendicular
C Both A and B
D None of these
In a partial journal bearing, the angle of contact of the bearing with the journal is
A 120°
B 180°
C 270°
D 360°
In a full journal bearing, the angle of contact of the bearing with the journal is
A 120°
B 180°
C 270°
D 360°
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 $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a
A Short bearing
B Long bearing
C Medium bearing
D Square bearing
A sliding bearing which operates without any lubricant present, is called
A Zero film bearing
B Boundary lubricated bearing
C Hydrodynamic lubricated bearing
D Hydrostatic lubricated bearing
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 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

Next steps