JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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Code: 9D15105
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M.Tech I Semester Supplementary Examinations February/March 2018
MATERIALS TECHNOLOGY
(Machine Design)
(For students admitted in 2012, 2013, 2014, 2015 & 2016 only)
Time: 3 hours
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Max. Marks: 60
Answer any FIVE questions
All questions carry equal marks
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- (a) Enumerate grain boundary strengthening mechanism.
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(b) For each of edge, screw and mixed dislocations, cite the relationship between the direction of the applied shear stress and the direction of dislocation line motion. - (a) What is the effect of temperature, strain and strain rate on plastic behavior? Explain.
(b) Briefly describe super plasticity and deformation of non crystalline materials. - (a) Explain the following properties with neat sketch:
(i) Toughness (ii) Fatigue (iii) Creep.--- Content provided by FirstRanker.com ---
(b) What is the criteria for selection of mechanical properties? Explain. - (a) Enumerate HSLA steels and TRIP steels.
(b) Explain about maraging steels and dual phase steels. - (a) What are the special characteristics of smart materials and explain shape memory alloys?
(b) Enumerate metallic glass, quasi crystal and nano crystalline materials. - (a) Briefly explain polymeric materials and their molecular structures.
(b) Explain production techniques for fibers, adhesives and coatings. - (a) Enumerate properties and applications of Si3N4, CBN and diamond.
(b) Explain processing and advantages of WC, TiC and TaC. - A continuous and aligned glass fiber-reinforced composite consists of 40 Vol% glass fibers having a modulus of elasticity of 69 GPa and 60 Vol% of a polyster resin that, when hardened, displays a modulus of 3.4 GPa.
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(i) Compute the modulus of elasticity of this composite in the longitudinal direction.
(ii) If the cross-sectional area is 250 mm² and a stress of 50 MPa is applied in this longitudinal direction, compute the magnitude of the load carried by each of the fiber and matrix phases.
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