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Material Science and Metallurgy Question Paper - Jun 18 - Mechanical Engineering (Semester 3) - Jawaharlal Nehru Technological University (JNTUH)
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Material Science and Metallurgy - Jun 18
Mechanical Engineering (Semester 3)
Total marks: 80
Total time: 3 Hours
NOTE-
This question paper contains two parts A and B.
Part A is compulsory which carries 25 marks. Answer all questions in part A.
Part B consists of 5 units. Answer any one full question from each one unit.
Each question carries 10 marks and may have a,b,c, as sub questions.
PART-A
1.a.
Differentiate between crystallized ceramics and cermets.
(2 marks)
00
1.b.
What is congruent melting intermediate phase.
(3 marks)
00
1.c.
Define composite.
(2 marks)
00
1.d.
Define allotropy and give examples.
(3 marks)
00
1.e.
Differentiate between Annaeling and normalising.
(2 marks)
00
1.f.
Explain why gain boundries look darker under the microscope, while the grains look brighter.
(3 marks)
00
1.g.
Which alloy of Fe-Fe3C system has the lowest melting point?
(2 marks)
00
1.h.
Differentiate between spheroidal graphite cast iron and Gray cast iron.
(3 marks)
00
1.i.
Differentiate between hardness and hardenability.
(2 marks)
00
1.j.
What are the $\alpha$ stabilizers in titanium alloys?
(3 marks)
00
PART-B
2.a.
What is the effect of grain boundaries on the the properties of a metal and alloys?
(5 marks)
00
2.b.
Distinguish between mattalic bond and chemical bond.
(5 marks)
00
OR
3.a.
State the Hume-Rothery rules for the the formation of substitutional solids solutions.
(5 marks)
00
3.b.
Differentiate between metal and alloys.
(5 marks)
00
4.a.
What is phase rule, level rule and cooling curve?
(5 marks)
00
4.b.
What is the isomorphous alloy system explain with suitable example.
(5 marks)
00
OR
5.a.
Draw and explain TTT diagrams
(5 marks)
00
5.b.
Explain obout chemical case hardening techniques.
(5 marks)
00
6.
Write explanatory notes on Annaeling, normalisation, hardening and tempering.
(10 marks)
00
OR
7.
Differentiate between construction of TTT Curves and phase diagram.
(10 marks)
00
8.
Write explanatory notes on:
(5 marks)
00
a) Copper and its alloys.
b) Aluminium and its alloys.
OR
9.
Enumerate the characteristics, properties and applications of titanium alloys.
(10 marks)
00
10.
Write short notes on:
(10 marks)
00
a)metal ceramic mixtures.
b) C-composites.
OR
11.
Write short notes on :
(10 marks)
00
a) Polymers.
b) Ceramics.
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