GTU BE 2019 Summer Question Papers || Gujarat Technological University
Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
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Subject Code: 2131904 Date: 07/06/2019
Subject Name: Material Science and Metallurgy
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | |
|---|---|
| Q.1 (a) Answer the following questions. | 07 |
| 1) What is Embryo? | |
| 2) What is strain hardening? | |
| 3) Define austenite. | |
| 4) Define critical cooling rate. | |
| 5) Define phase. | |
| 6) Mention any one etchant used for mild steel along with its chemical composition. | |
| 7) Write basic composition of SS304 (Austenitic Stainless Steel). | |
| (b) Explain homogeneous nucleation using concept of free energy change. | 04 |
| (c) Calculate proportion of phases present in 0.2% carbon steel at room temperature using lever rule principle as per Fe-C equilibrium diagram. | 03 |
| Q.2 (a) Draw Miller indices for planes (0 1 1), (1 0 0) and (1 1 1) and directions [0 1 1],[1 0 0] and [1 1 1] in a simple cubic crystal. | 03 |
| (b) What is red hardness? Explain specific purpose of different alloying elements in 18-4-1 HSS tool steel. | 04 |
| (c) What is pro-eutectoid ferrite? With neat sketch explain step by step solid state transformation of 0.4% carbon steel from single phase Austenitic temperature to room temperature under equilibrium condition. Also draw room temperature microstructure and label phases present in it. | 07 |
| OR | |
| (c) Write Eutectoid reaction for Fe-C binary alloy system. Calculate proportion of phases present in Pearlite. Also explain Austenite to Pearlite transformation process with neat sketch. | 07 |
| Q.3 (a) Differentiate between deformation by slip and twinning. | 03 |
| (b) Enlist different methods of preparation of metal powders and discuss characteristics of metal powders used in powder metallurgy. | 04 |
| (c) Draw different heat treatment cooling rate on T-T-T diagram mentioning respective final microstructure for low carbon steel. Write characteristics of Martensite. | 07 |
| OR | |
| Q.3 (a) Why grain boundary is considered as a crystalline imperfection? | 03 |
| (b) What is sintering? Why is sintering carried out in controlled-atmosphere furnace? | 04 |
| (c) What is the effect of carbon and other alloying elements on T-T-T diagram? Explain in detail with neat sketch. What is the importance of this phenomenon in welding of alloy steels? | 07 |
| Q.4 (a) Write typical composition and application of: 1) Cartridge Brass 2) Inconel | 03 |
| (b) Why normalizing produces structure having superior strength and hardness compared to annealing? | 04 |
| (c) Explain mechanical properties and applications of Gray Cast Iron. | 07 |
| OR | |
| Q.4 (a) What are the outstanding properties of cupronickel alloys? | 03 |
| (b) Write purpose of the case hardening heat treatment and explain any one in detail. | 04 |
| (c) Write short note on Malleable Cast Iron and Nodular Cast Iron. | 07 |
| Q.5 (a) What informations may be obtained from an equilibrium diagram? | 03 |
| (b) Explain various criterions for selection of material for engineering application. | 04 |
| (c) Explain working principle of Eddy Current Test. Mention various applications of Eddy Current Test. | 07 |
| OR | |
| Q.5 (a) Write limitations of RT and UT. | 03 |
| (b) Explain various methods of magnetization used in MPT. | 04 |
| (c) Calculate density of copper crystal using following data. Atomic Radius of copper is 1.278 A, Atomic weight of copper is 63.5 gm/mol. Take Avogadro’s number = 6.023 x 1023. | 07 |
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