JNTU
JNTU B.Tech III PROPERTIES OF NANOMATERIALS Previous Question Paper (November/December - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Answer all questions in Part A.
How you differentiate Soft magnet and Hard magnet based on B-H curve.
Answer
Soft magnets exhibit a narrow B-H hysteresis loop with low coercivity and low remanence, indicating easy magnetization and demagnetization. Hard magnets exhibit a wide B-H hysteresis loop with high coercivity and high remanence, indicating resistance to demagnetization and suitability for permanent magnets.
How you differentiate ceramic and polymeric materials at bulk and nano?
Answer
Bulk ceramics are brittle and hard, while nano-ceramics exhibit increased toughness and ductility due to grain boundary effects. Bulk polymers are flexible and ductile, whereas nano-polymers show enhanced mechanical strength, thermal stability, and barrier properties due to high surface-to-volume ratios and polymer-filler interactions.
Why gold nanoparticles show different colors at different sizes? Explain briefly.
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How are nanomaterial classified?
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Give some thermal properties of nanomaterials.
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Why electrical and optical properties of nanomaterials are connected together.
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What is Grain morphology?
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Explain elasticity of nanomaterials.
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What is anisotropy?
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What is Plasticity? Discuss poly crystal plasticity.
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Part B
Answer any one full question from each unit.
Enlist with examples how nature is “best nanotechnologist”.
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Discuss briefly importance of nano materials in Art and Cultural Heritage.
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Discuss Intrinsic Thermal Properties briefly.
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Distinguish Specular and Diffuse Reflection with a schematic diagram.
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Write in detail about any one type/classification of nanomaterials with examples.
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What is Quantum Confinement Effect? What properties will be affected with this effect? Explain the concept with a suitable example.
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Differentiate metals, semiconductors and insulators with the help of electronic energy diagram? Explain what will happen if the material size reaches to Bohr exciton radius.
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Explain the Thermal Properties of Nanomaterials briefly.
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Explain how melting point and elastic properties of nanomaterials differ from bulk materials.
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Discuss the Acoustic properties briefly.
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Discuss in detail the Elasticity of discrete Nanomaterials.
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Explain Elasticity of Nanodevices Materials briefly.
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Explain in detail the Continuum descriptions of Plastic Behavior in case of nanomaterials.
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Discuss about the concept of the physical basis of yield strength.
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Discuss the plastic deformation of nanomaterials briefly.
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