LUBRICANTS  
Questions 1. Define lubricants. What are the functions of a lubricant?

 2. Classify lubricants with suitable examples. 

3. What is lubrication? What are the various mechanisms of lubrication?

 4. Distinguish between Fluid film Boundary lubrication.

 5. Explain the mechanism of lubrication of tractors, gears of heavy machineries. 

6. Explain the mechanism of lubrication of delicate instruments. 

7. Discuss the mechanism of Extreme pressure lubrication.

 8. What are greases? Under what conditions are they used? 

9. What are solid lubricants? Under what conditions are they used? What are the requirements to be fulfilled for a solid to be used as a lubricant? 

10. Write short notes: (i) greases (ii) solid lubricant 

11. A good lubricant should have high viscosity index. Give reason. 

12. A good lubricant should have low cloud and pour point. Give reason. 

13. A good lubricant should have high flash and fire point. Give reason.

 14. A good lubricant should have It acid value. Give reason. 


15. Define and explain the following properties of lubricant: (i) viscosity and viscosity. Index (ii) flash and fire point (iii) cloud and pour point (iv) saponification value (v) acid value NO oiliness. 

16. What are blended oils? Give a few examples. How are they better than animal vegetable oils? 17. What are synthetic lubricants? Discuss their properties. 

18. What is a cutting fluid? Where is it used? 

19. Why are antioxidants added to hydrocarbon oils? 

20. Discuss the properties of vegetable and mineral oil used as lubricant. 21. What are the requirements of the properties of a lubricant to be used under the following conditions and also give two examples of each wherever possible: (i) lubricant for cutting tools