Related Questions

A suitable lubricant used for watches is
A Metallic soap solution
B Grease
C Palm oil
D Hazel-nut oil
__________ is the most suitable lubricant for drawing mild steel wires?
A Kerosene
B Water
C Sodium stearate
D Lime water
Which of the following is used as a lubricant?
A Graphite
B Silica
C Iron Oxide
D Diamond
Which of the following is used as a lubricant in heavy machines?
A Bauxite
B Sulphur
C Phosphorus
D Graphite
Which of the following is also used as a lubricant?
A Cuprite
B Graphite
C Haematite
D Cryolite
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
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
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
Lubricant used for ball bearing is usually
A Graphite
B Grease
C Mineral oil
D Molasses
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 $$\frac{{\text{N}}}{{{\text{Zp}}}}$$

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