Lubricants MCQs

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1. . The process of introducing lubricant between the two moving parts in a machine is called:





2. . Lubricants are primarily used to reduce:





3. . In addition to other industrial applications, lubricants are used for:





4. . Oil, water, and oil emulsion are used as:





5. . Cutting fluids should have viscosity:





6. . Mineral oils that are used as lubricants are obtained from:





7. . A maximum hardness on the Moh’s scale appears to be the practical limit for solid lubricant:





8. . The oils which decompose at high temperature, undergo oxidation easily, forming gummy and acidic hydrolyzed products are:





9. . The blended oils are mixtures of vegetable oils and:





10. . Petroleum oils have long-chain hydrocarbons, ranging between:





11. . The lubricants which are produced by oils or fats with soap and water at 204–316°C are:





12. . Oiliness of which oils can be improved by adding oils, such as Oleic and Stearic acid:





13. . Synthetic lubricants Polyglycols are produced by oxidation of ethylene and:





14. . The solid lubricant should have melting point:





15. . Which lubricant is usually used when it is not practical to use oil:





16. . Molybdenum disulfide is a common lubricant:





17. . Light machines like sewing, watches, scientific equipment require lubricating oil of viscosity:





18. . Road rollers, tractors, railway tracks require lubricant:





19. . Steam engine cylinders require lubricant of viscosity:





20. . Spaceship, aeroplane engine, submarine engine, military weapons require lubricants:





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