Material Science - May 2014

Mechanical Engg (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Solve any three:

1 (a) Differentiate between cold working and hot working.(4 marks)

Answer any one question from Q1 and Q2

1 (b) What is role of dislocation in the plastic deformation of metal.(4 marks) 1 (c) Explain how engineering materials are classified. Explain in brief thermoplastic and thermosetting polymers.(4 marks) 1 (d) Explain elastomers.(4 marks)

Solve any three:

2 (a) What is recrystallization? Explain the factors affecting recrystallization process.(4 marks) 2 (b) Explain the strain hardening with curve.(4 marks) 2 (c) Explain hybrid composites.(4 marks) 2 (d) Write short note on ceramic materials.(4 marks)

Answer any one question from Q3 and Q4

3 (a) What is endurance limit ? Explain fatigue fracture with suitable figure. Also state the applications where fatigue strength is necessary.(6 marks) 3 (b) Write short notes on:
1) Poldi hardness test
2) Compression test.(7 marks) 4 (a) Which type of test is carried out at high temperature of metal sample under test. Also explain the related curve obtained. (Draw suitable figure).(7 marks) 4 (b) Write short notes on:
1) Erichson cupping test
2) Durometers.(6 marks)

Answer any one question from Q5 and Q6

5 (a) Explain the process of impregnation of self lubricating bearings.(4 marks) 5 (b) Draw a flow chart for the production of cemented tools.(5 marks) 5 (c) Explain the terms:
I) Flow rate
II) Apparent density.(5 marks) 6 (a) Describe the steps involved in manufacturing of powder metallurgy component.(5 marks) 6 (b) Explain the atomization process of powder manufacturing with neat sketch.(4 marks) 6 (c) Write a short note diamond impregnated cutting tools.(4 marks)

Answer any one question from Q7 and Q8

7 (a) Classify different magnetic materials, and explain any one in detail.(6 marks) 7 (b) Give classification of different biomaterials, and explain any one in detail with proper applications.(6 marks)

Write short note on (any three):

8 (a) Carbon nanotubes(4 marks) 8 (b) Smart materials(4 marks) 8 (c) Behaviour of metal at low temperature.(4 marks) 8 (d) Soft and hard magnetic materials.(4 marks)