4IM8 Chapter 8 Lubrication Exam Questions With Verified Answers.

4IM8 Chapter 8 Lubrication Exam Questions With Verified Answers. Walking requires friction between the feet and floor in order to move. - answerTrue Lubrication generally involves coating surfaces with a material that has a higher coefficient of friction than the original surfaces. - answerFalse Friction occurs when an object in contact with another object tries to move. - answerTrue Animal and vegetable oils are used mostly in the food industry. - answerTrue Petroleum is composed of 12% carbon and 85% hydrogen, with a small amount of other elements. - answerFalse Animal and vegetable oils contain fatty acids. - answerTrue The grease used in a centralized system should be one grade softer than is otherwise required. - answerTrue Sealed bearings should be relubricated on a regularly-scheduled basis. - answerFalse Shear stress is stress in which the material on one side of a surface pushes on the material on the other side of the surface with a force perpendicular to the surface. - answerFalse Synthetic lubricants are generally higher priced than petroleum lubricants. - answerTrue Lubricant contamination is the main cause of mechanical system failure. - answerTrue Oil that is contaminated with water has a clear appearance. - answerFalse Petroleum is formed by an evolutionary process that takes many millions of years. - answerTrue Greater force is required to move a body from a static condition than is required to keep it in a kinetic condition. - answerTrue The flow rate is the most important property of a lubricant. - answerTrue Under basic conditions, as the temperature of oils increases, their viscosity also increases. - answerFalse