Material Science - Dec 2014
Mechanical Engg (Semester 3)
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) Sketch within a cubic unit cell the following planes:
(100), (110), (111) and (011).(4 marks) 1 (b) Differentiate between slip and twinning.(4 marks) 1 (c) Explain the classification of composites.(4 marks) 2 (a) The planes in a crystalline solid intersect the crystal axes at (2a, 2b, c), (2a, b, 2c) and (a, b, c). Calculate the Miller Indices of this plane.(4 marks) 2 (b) Explain any two Imperfection in Crystal (or Lattices) from the list given below:
(i) Edge Dislocation
(ii) Stacking fault
(iii) Low angle boundary.
(4 marks) 2 (c) A glass fibre reinforced epoxy matrix composite contains 60 volume percent of continuous glass fibre. Determine Young's modulus of the composite assuming longitudinal loading condition. Modulus of elasticity for glass fibre is 72 GPa and that of epoxy is 2.4 Gpa.(4 marks)
Solve any one question from Q3 and Q4
3 (a) The following observations are made during tension test carried
out on a 15 mm diameter plain carbon steel rod:
Yield load = 68 kN
Ultimate tensile load = 105 kN.
Find the yield strength and ultimate tensile strength of the steel rod.(4 marks) 3 (b) Which non-destructive test is suitable for the following Situations?
(i) For detection of surface cracks on brass components.
(ii) For detection of slag inclusion of welded joint.(4 marks) 3 (c) What are the non-destructive applications of eddy current Testing?(4 marks) 4 (a) Explain fatigue test.(4 marks) 4 (b) Explain piling up and sinking effects on surface of test piece found when conducting Brinell Hardness test.(4 marks) 4 (c) Explain the principle advantages and limitations of Radiographic Test.(4 marks)
Solve any one question from Q5 and Q6
5 (a) Briefly explain Bio-material and its classification?(6 marks) 5 (b) What are Nano-materials ? Explain any three properties of Nano materials.(7 marks) 6 (a) Briefly explain Biosensors and its application.(6 marks) 6 (b) Write advantages of Cryogenic materials.(3 marks) 6 (c) Explain Shape Memory Alloys (SMA).(4 marks)
Solve any one question from Q7 and Q8
7 (a) What are the major steps in manufacturing of component by Powder Metallurgy?(6 marks) 7 (b) What are the advantages and limitations of Powder Metallurgy?(7 marks) 8 (a) Draw the flow chart for manufacturing of cemented Carbides?(6 marks) 8 (b) List down the steps involved in production of sintered structural Components?(3 marks) 8 (c) What is conditioning of metal powders?(4 marks)