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Material Science Question Paper - Dec 18 - Mechanical Engineering (Semester 3) - Visveswaraya Technological University (VTU)
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Material Science - Dec 18
Mechanical Engineering (Semester 3)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Module-1
1.a.
Draw FCC lattice and calculate its atomic packing factor.
(4 marks)
00
1.b.
Classify crystal imperfection, explain points in detail.
(6 marks)
00
1.c.
The surface of steel gear made of 1020 steel (0.2%C) is to be gas carburized at $927^{o}$. Calculate the time required to increase the carbon content to 0.4% at 1 mm below the surface if the carbon potential at surface is 1.2 wt% erf(0.9) = 0.8
(6 marks)
00
OR
2.a.
Define creep, with a typical creep curve, explain three stages of creep.
(8 marks)
00
2.b.
With the help of a neat coventional stress-strain diagram, explain behaviour of mild steel, under tension till fracture.
(6 marks)
00
2.c.
Draw S-N curve for steel.
(2 marks)
00
Module-2
3.a.
Explain Hume Rathery rules for the fomation of solid solution.
(6 marks)
00
3.b.
Draw and explain the Iron-Carbon equilibrium diagram and label all the points and fields
(10 marks)
00
OR
4.a.
Explain the following with example:
(10 marks)
00
i) Gibb's phase rule
ii) Lever rule
4.b.
Explain any four types of stainless steel based on their crystal structure..
span class='paper-ques-marks'>(6 marks)
00
Module-3
5.a.
What is TTT diagram? Explain with a neat diagram the martenstic transformation of austenite.
(8 marks)
00
5.b.
Write notes on the following:
(8 marks)
00
i) Annealing ii) Carburizing
OR
6.a.
What is hardening ? Explain with a neat sketch induction hardening.
(8 marks)
00
6.b.
Briefly explain the compostiton, properties and applications of grey cost iron.
(8 marks)
00
Module-4
7.a.
What are the properties of ceramic materials?
(4 marks)
00
7.b.
With a neat sketch, explain tape casting.
(6 marks)
00
7.c.
Explain with a neat diagram, the processing of plastic by injection molding.
(6 marks)
00
OR
8.a.
Explain working principle of optical fiber.
(6 marks)
00
8.b.
What are the applications of shape memory alloys?
(6 marks)
00
8.c.
Explain any two methods of NDT.
(4 marks)
00
Module-5
9.a.
With a neat sketch, explain filaments winding.
(8 marks)
00
9.b.
Explain production of composite materials by spray-up process.
(8 marks)
00
OR
10.a.
A tensile load of 500N is applied to a epoxy-glass fiber composite. If the cross section of the composite is 1 $mm^{2}$ and the volume of the fiber is 30% calculate the stress in the glass fiber when:
(6 marks)
00
i) The load axis is parallel to the fiber
ii) The load axis is perpendicular to the fiber.
Take the values of Young's modulus for thr glass fiber as 86 $GN/mm^{2}$ and for matrix as 3.38 $8_{3}$
10.b.
Explain the following :
(10 marks)
00
i) Production of MMC's by stir casting
ii) Pulstrusion process
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