written 5.6 years ago by
yashbeer
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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)