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19. The function of lubricant are(a) it reduces friction(c) it acts as a sealant for gases(b) it acts as coolant(d) All the above

Answer»

Answer:d)all the aboveExplanation:Reduced friction prevents heating and abrasion on the friction surface. Especially in the hydraulic system, lubricants itself serve to prevent the leakage by creating a hydraulic film.Friction certainly causes heating on the area and more heat is produced if metals rub against each other. Therefore the heat needs to be absorbed or released; otherwise the system is destroyed or deformed. To prevent it, lubricants are applied. Especially cooling is critical to rolling oils, cutting oils, and lubricating oils used in an internal combustion engine.



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