Lubricants MCQs – Chapter 16 DAE

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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 of on the Moh’s scale appears to be the practical limit for solid lubricant is





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.





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 sewing, watches, scientific equipments 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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