Question Paper: Material Technology Question Paper - May 18 - Mechanical Engineering (Semester 3) - Mumbai University (MU)
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Material Technology - May 18

Mechanical Engineering (Semester 3)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question No. 1 is compulsory
(2) Attempt any three questions from remaining five questions
(3) Draw neat diagrams wherever necessary

1. Write short notes on (any four)

  • (a) Smart materials
  • (b) Creep Test 296

  • (c) Effect of Alloying elements on properties of steel 323

  • (d) Critical resolved shear stress 280

  • (e) Classification of Stainless steels 324

(5X4 = 20 marks)

2(a) What do you understand by Composite materials? Explain their properties and applications.
(10 marks) 332 329

2(b) What is Fatigue? Explain fatigue testing in detail.
(10 marks) 293

3(a) Draw $F_e - (F_e)_3C$ Diagram and Explain cooling of 0.9% C alloy in the $F_e - (F_e)_3C$ diagram.
(10 marks) 303

3(b) How are dislocations regenerated at Frank Reed Source? Explain with neat diagram.
(5 marks) 285

4(a) Draw and explain construction of Time Temperature Transformation (TTT) diagram. Also indicate various cooling patterns on the diagram.
(10 marks) 305

4(b) Derive an expression for Griffith theory of brittle fracture. Explain Orowan's Modification.
(10 marks) 291

5(a) Explain slip and twin mechanism of plastic deformation.
(10 marks) 282

5(b) Classify Crystal Imperfections. Distinguish between Edge and Screw dislocation.
(10 marks) 284 286

6. Write short notes on (any four)

  • (a) Hardenability test 307

  • (b) Martempering 321

  • (c) Synthesis of Nanomaterials 331

  • (d) Recrystallisation annealing 281

  • (e) Rule of mixtures for composites

(5X4 = 20 marks)

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