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Unit I
Conducting Materials
1. On the basis of free electron theory, derive an expression for electrical conductivity.
2. State and prove Wiedmann-Franz law.
3. Deduce the mathematical expression for electrical conductivity and thermal conductivity of a conducting material and hence obtain Wiedmann-Franz law.
4. Write Fermi-Dirac distribution function. Explain how fermi function varies with temperature.
5. Derive an expression for the density of states and based on that calculate the carrier concentration in metals.
6. With a neat diagram, derive an expression for density of states.
Unit II
Semiconducting Materials
1. Write the expression for the concentration of electrons in the conduction band of an intrinsic semiconductor.
2. . Write the expression for the concentration of electrons in the valence band of an intrinsic semiconductor.
3. What is Fermi level in a semiconductor?
4. Write the expression for electrical conductivity of an intrinsic semiconductor.
5. What is meant by doping?
6.Explain the concept of hole in semiconductor.
7. Write an expression for carrier concentration in n-type semiconductor.
8. Write an expression for carrier concentration of holes in the valence band of p-type semiconductor.
9. Explain the variation of Fermi level with temperature in the case of p-type semiconductor and n-type semiconductor.
10. Define Fermi level in the case of semiconductors. Mention its position in intrinsic and extrinsic semiconductors at 0K.
11. Define Hall effect and Hall voltage.
12. Mention any four applications of Hall effect.
Unit III
Magnetic Materials
1. Briefly explain different types of magnetic material and their properties.
2. (i) What is ferromagnetism?
(ii) Explain the reason for the formation of domain structure in a ferromagnetic material.
3. (i) Classify the material on the basis of their spins
(ii) What are ferromagnetic domains?
(iii) What are it merits and demerits?
4. Explain ferromagnetic domain theory.
5. Discuss the domain structure in ferromagnetic materials.
6. Explain hysteresis on the basis of domain theory of ferromagnetism.
7. Briefly explain different types of energy involved in domain growth.
8. Distinguish between anti-ferro and ferromagnetic materials
9. Distinguish between soft and hard magnetic materials.
10. Briefly explain the structure and applications of ferrites.
Superconducting materials
1. Explain the superconducting phenomenon. What are its properties and its applications?
2. (i) What are high Tc superconductors? Give examples.
(ii) Explain Miessner effect, type I and type II superconductors.
3. (i) What is superconductivity>
(ii) Mention any four property changes that occur.
(iii) Explain the effect of isotopes in superconductors.
(iv) Explain type I and type II superconductors.
(v) Mention two applications.
4. (i) Explain Meissner effect and magnetic levitation.
(ii) Discuss the applications of superconductor.
Unit IV
Dielectric Materials
1. Explain the different types of polarisation mechanism involved in a dielectric material.
2. Derive an expression for electronic and ionic polarisabilities.
3. Briefly explain the effects of frequency and temperature on polarisation of dielectrics.
4. What is meant by local field in a dielectric and how is it calculated for a cubic structure. Deduce clausius – Mosotti relation.
5. Discuss in detail the various dielectric breakdown mechanisms.
6. Briefly explain the applications of dielectrics.
7. What are ferroelectric material? Mention few example and explain any four applications of ferroelectric materials.
Unit V
Modern Engineering materials
1. What are metallic glasses? How are they prepared? Explain their properties and applications.
2. What are shape memory alloys? Write their characteristics. List out any four applications of shape memory alloys
Nanomaterials
1. Describe the ball milling technique to produce nanoparticles.
2. Explain with neat sketch the plasma arcing method to produce nanoparticle.
3. Briefly explain the sol-gel method of preparing nano phase material and mention its advantages.
4. What are the two types of vapour phase deposition? And describe chemical vapour deposition technique.
5. Explain the different properties which change significantly in materials at nano phase.
6. What are nano phase materials? How do their physical properties vary with geometry?
7. What are nano phase materials? Discuss the mechanical behaviour of nanostructures material.
8. Discuss any two techniques of synthesis of carbon nanotubes (CNT) and mention its applications.
9. Discuss the electrical, mechanical and physical properties of CNT.
10. Explain properties and applications of CNT.
11. Discuss applications of nano materials in various fields.