BE Electrical Engineering Semester 1 (FE First Year) - University of Mumbai Important Questions for Applied Chemistry 1

BUNA-S

Write a short note on Injection moulding method for plastic.

Define Fabrication. List the methods used. Discuss extrusion moulding in detail.

What are the additives mixed with plastics for its compounding? Explain their functions.

Write a note on Visco-elastic state.

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 .