Question Paper: Engineering Metallurgy : Question Paper Dec 2014 - Mechanical Engineering (Semester 4) | Pune University (PU)
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Engineering Metallurgy - Dec 2014

Mechanical Engg (Semester 4)

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 one question from Q1 and Q2

1 (a) With a neat diagram show the cooling curve of eutectic diagram and show the application of Gibb's phase rule in each region.(4 marks) 1 (b) What is nucleation ? What are its types ?(2 marks) 1 (c) Draw the steel region of Iron-Carbon equilibrium diagram and explain Austenite and Pearlite phase in detail.(6 marks) 2 (a) Explain classification of tool steel in detail.(4 marks) 2 (b) What do you mean by weld decay ?(2 marks) 2 (c) What is coring ? Which alloys shows coring ?(4 marks) 2 (d) Explain the following:
i) Phase
ii) Variable.
(2 marks)


Solve any one question from Q3 and Q4

3 (a) Draw and show the following heat treatments on TTT curve and state the transformed product:
(i) Martempering
(ii) Austempering
(iii) Ausforming.
(6 marks)
3 (b) Explain in detail stress corrosion and pitting corrosion with the remedies to avoid it.(7 marks) 4 (a) What are the various transformation products of austenite? Explain any one in detail with respect to transformation mechanism, temp, characteristics and structure.(7 marks)


Write short note on:

4 (b) (i) Intergranular corrosion(3 marks) 4 (b) (ii) Electroplating.(6 marks)


Solve any one question from Q5 and Q6

5 (a) Compare gray cast iron and white cast iron with respect to composition, microstructure, application.(6 marks) 5 (b) What are the advantages of cast iron over steel? Explain the role of Si and Phosphorous in cast iron.(7 marks) 6 (a) Suggest the suitable cast iron for the following applications and justify:
i) Jaw crusher
ii) Automobile shaft
iii) Bearing.
(6 marks)
6 (b) Explain in detail production of modular and malleable cast iron.(7 marks)


Solve any one question from Q7 and Q8

7 (a) Suggest suitable non-ferrous material for the following applications and write its composition:
i) Imitation Jewellery
ii) Bell
iii) Coins.
(6 marks)
7 (b) Explain the role of Sn in brass.(2 marks) 7 (c) Describe the classification of Brasses.(4 marks) 8 (a) Enlist type of non-ferrous bearings. Why are they used in bearing? Explain any one in detail.(6 marks) 8 (b) Explain with a neat diagram how the strength of Al-Cu alloy can be increased.(6 marks)

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