JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV NANOCOMPOSITES Previous Question Paper (May - 2019 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
(25 Marks)
What are Nanocomposites? Mention their applications.
Answer
Nanocomposites are multiphase materials where at least one of the constituent phases has dimensions in the nanometer range (typically 1–100 nm). They are used in aerospace components, automotive parts, medical implants, sensors, and high-strength packaging materials.
What is nanoindenter? Mention its uses.
Answer
A nanoindenter is a precision instrument used to measure the mechanical properties of materials at the nanoscale by applying a controlled load through a diamond tip. It is used to determine hardness, elastic modulus, creep behavior, and fracture toughness of thin films and small-volume samples.
What are the objectives of intra granular dispersions in ceramic Nanocomposites?
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Write notes about the characteristics and properties of multilayered thin-film Nanocomposites.
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How Carbon Nanotubes are produced?
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Define intercalation and exfoliation in nanocomposites.
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What are the basic concepts of Rouse model?
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What is “bonded polymer layer” theory of polymer nanocomposites?
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List the products made and advantages of power metallurgy method.
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Write notes about stir casting method for manufacture of nano – composites.
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Part B
(50 Marks)
Discuss the prediction of mechanical behavior for nano – composites using stress – strain relationships.
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Explain the procedure for measuring the toughness of nanocomposite materials.
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Explain the important mechanical properties of nano composite materials.
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Define Young’s modulus, shear modulus and bulk modulus of nano materials.
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With a Schematic diagram for generalized thermal spray process, discuss the synthesis of Nanocomposites.
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Mention the applications of nanocomposites from Sol– Gel synthesis method.
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Explain the synthesis of metal matrix nanocomposites by power metallurgy method and squeeze casting method.
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Mention the advantages and disadvantages of carbon nanotube based nanocomposites.
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Describe the production of nanocomposites via extraction techniques using nanoparticle containing dispersions.
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Write notes about solution casting technique for nanocomposite synthesis.
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Discuss the processing of polymer nanocomposites by: Hot melt impregnation method and solution impregnation method.
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Explain the need for modeling of nanocomposite materials synthesis and characterization.
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Describe the Voigt upper bound and Reuss lower bound (V-R model) for the prediction of modulus of elasticity of nanocomposites.
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Discuss the prediction of reliability and properties of nano materials using Monte Carlo model method.
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Summarize the assumptions made and limitations of “ab initio” modeling method.
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Describe the synthesis and fabrication of nanocomposites using pressure infiltration process.
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Mention the advantages and applications of stir casting method.
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Discuss the principle of Chemical vapor deposition and physical vapor deposition method for Nanocomposite Coatings.
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Mention the properties and applications of diamond-like carbon (DLC) coating.
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