BE Electrical Engineering छमाही १ (इंजीनियरिंग) - University of Mumbai Important Questions

1.4 gm of oil required 1.8 ml of 0.01N KOH for neutralization. Calculate the acid value and mention whether the oil is suitable to be used or not.

What is oiliness? What is its importance in lubrication?

Write a note on Greases. 

Define lubricants and lubrication. Discuss the hydrodynamic lubrication in detail.

Define Cloud point and Pour point of a lubricant.

Define the Flash point.

Define the Oiliness .

Define the Pour point .

6gms of oil was saponified with 50ml of 0.5N alcoholic KOH solution. After refluxing for 2 hours the mixture was titrated with 25ml O.SN HCL Rnd the sponification value of Oil .

Define Oiliness. What is its significance {

Mention the conditions under which semi-solid lubricants can be used

Define lubricants and lubrication. Mention the various mechanisms involved in lubrication of machine. Discuss boundary lubrication.

Define flash point and fire point? Give its significance.

9ml of oil is taken from machine and it requires 1.5ml of 0.04 N KOH. Find acid value( density= 0.81 g/ml)

20ml of lubricating oil was dissolved in alcohol The solution was titrated against 0.1 N KOH solution. At the end point the burette reading was found to be 2. 5ml calculate the acid value of the oil.  ( density of oil= 0.86 g/ml)

What is lubrication? Explain the mechanism of fluid film lubrication.

Explain the mechanism of Extreme pressure lubrication.

What are the conditions for use of solid lubricants? Discuss the structure and uses of Graphite.

Write the significance of the following properties of lubricants.
i)Emulsification ii)Cloud point  iii)Fire point

Name two additives added in blended oils .Give one example of each .