Lubrication is necessary to protect wear and tear caused due to Select one:a.Electrostatic forceb.Gravitational forcec.Frictional forced.Magnetic forceClear my choice

What is meant by lubrication ? Why do we lubricate the moving parts of our vehicles ? Name some lubricants and where they are used

Which of the following statements are true regarding lubricants?Lubricants are designed to increase frictionLubricants are used to speed up movementLubricants increase the roughness of a surfaceLubricants are used to reduce friction between moving parts

Hydrodynamic lubrication applied when the load is low and the speed is high.Select one:TrueFalse

Choose examples of how water is used as a lubricant.

The article “Wear in Boundary Lubrication” (S. Hsu, R.Munro, and M. Shen, Journal of Engineering Tribology, 2002: 427-441) discuses several experiments involving various lubricants. In one experiment, 45 steel balls lubricated with purified paraffin were subjected to a 40 kg load at 600 rpm for 60 minutes. The average wear, measured by the reduction in diameter, was 673.2 μm, and the standard deviation was 14.9 μm. Assume that the specification for a lubricant is that the mean wear be less than 675 μm. Find the P– value for testingH0 : μ≥675 versus H1 :μ<675. What can we conclude based on the P– value?