BE Electronics Engineering Semester 1 (FE First Year) - University of Mumbai Important Questions

Discuss the drawback of natural rubber.

What is the functions of fillers and plastisizers in the compounding of plastic?

Write the preparation, properties and uses of PMMA and Buna-S.

Define Moulding. List the different techniques of moulding. Explain injection moulding with the help of neat diagram.

Give the preparation, properties and uses of polymethyl methacrylate polymer.

What are the draw backs of natural rubber?

Discuss the following additives in compounding of plastics

(a) Fillers (b) Plasticizers.

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.