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

What is glass transition temperature ?Write its significance .

Distinguish between thermoplastic and thermosetting polymer.

What is fabrication of plastic ? Explain injection moulding process with a neat diagram .

Natural rubber requires vulcanization .Give reasons .With appropriate reactions explain how the drawbacks are overcome.

Write preparation ,properties and uses of following polymers : i) Kevlar ii) Silicone rubber iii) Buna S

When would solid lubricants are used?

Define flash and fire points.

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.