Material Technology Question Paper - Jun 19 - Mechanical Engineering (Semester 3)

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Material Technology - Jun 19

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) Figure at right indicate full marks.

1. Write short notes on any four:

1.a. Explain thermal fatigue of metal.

(5 marks) 298

1.b. What are smart Material? Where are they used?

(5 marks) 00

1.c. write the differences between ductile fractures and brittle fractures.

(5 marks) 295

1.d. explain Hume-Rothery's rules of solid solubility.

(5 marks) 325

1.e. explain the transformation of Austenite to bainite.

(5 marks) 305

2.a. What is dislocation? What are the sources of dislocation? Compare edge and screw dislocation.

(10 marks) 284

2.b. What is recrystallization Annaeling? Discuss the various stages of recrystallization Annaeling.

(5 marks) 281

2.c. Write the differences hot working and cold working.

(5 marks) 00

3.a. What are the characteristics of brittle fractures? Discuss the Griffith theory and derive its equation.

(10 marks) 291

3.b. Discuss the ductile brittle transition in steel.

(5 marks) 00

3.c. Define creep and explain stages of creeping.

(5 marks) 290

4.a. Draw Fe-Fe3C diagram indicating all important temperature, phases and composition. Explain slow cooling of an alloy containing 0.9% carbon when cooled from 1600° C temperature to room temperature.

(10 marks) 00

4.b Write short notes on allotropic forms iron.

(5 marks) 309

4.c. Draw and explain Isomorphous phase diagram.

(5 marks) 301

5. Write short notes on following:

5.a. Nano-material

(4 marks) 330

5.b. what are composite? Write it's characteristics.

(4 marks) 329

5.c. Discuss the process of nitriding.

(5 marks) 318

5.d. Explain the effect of retained Austenite on steels.

(5 marks) 00

5.e. What are stainless steel? Give brief if classification of stainless steel.

(5 marks) 324

6.a. Draw TTT curve for a Eutectiod steel and explain the effect of various cooling.

(10 marks) 306

6.b. Write the classification of tool steels.

(5 marks) 328

6.c. Explain induction hardening process.

(5 marks) 00

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