Engineering Material Science Question Bank PDF

# Question Bank Class: SE (ELT/EEE) Subject: Engineering Material Science ## Unit I: Electrical Conducting Materials 1. Explain various point defects in crystal. 2. Explain classical free electron theory. 3. Define i) Mean free path of an electron ii) Drift velocity iii) Collision time 4. What is s...

# Question Bank Class: SE (ELT/EEE) Subject: Engineering Material Science ## Unit I: Electrical Conducting Materials 1. Explain various point defects in crystal. 2. Explain classical free electron theory. 3. Define i) Mean free path of an electron ii) Drift velocity iii) Collision time 4. What is superconductivity? Explain various properties of superconductivity. 5. State and explain Types of Superconductors. 6. Describe the formation of energy bands in solids and explain with proper diagrams Classification of materials into conductors and insulators. 7. With reference to superconductivity explain with neat diagrams - Meissner effect - Cooper pair formation - High temp super conductivity ## Unit II: Dielectric Materials 1. Define Electric dipole moment and explain dielectric polarization and indicate different types of polarizations 2. Derive Clausius-Mosotti relation in dielectrics. 3. Explain Piezo electric materials and state its applications. 4. Define i) Dielectric constant ii) Dielectric loss iii) Dielectric breakdown 5. A parallel plate capacitor has capacitance of 4 micro farad. The dielectric has permittivity of 150 for an applied field of 600V. Find the energy stored in capacitor wall and energy stored in polarizing dielectric. ## Unit III: Semiconductor Materials 1. Explain the concept of Fermi-level in case of semiconductors and derive an expression for Fermi-energy in intrinsic semiconductor. 2. Explain Hall Effect and its significance. Give its applications. 3. Obtain the expression for the - Total conductivity of semiconductor - Conductivity of N & P semiconductors. 4. Derive an expression for Hall voltage and Hall coefficient. 5. Explain P-type and N-type semiconductor. 6. Write a short note on fabrication process. ## Unit IV: Magnetic Materials 1. Give the classification with examples for magnetic materials based on relative Permeability μγ 2. Define magnetic dipole moment &relative permeability μ,.. Show that μγ = (1 + γm) where is ym magnetic susceptibility 3. How do you distinguish between diamagnetic, paramagnetic and ferromagnetic materials. 4. What is Hysteresis loop? What does it represent? Explain its significance. 5. Classify the magnetic materials and state the properties of magnetic materials. 6. Differentiate between soft and hard magnetic materials. 7. Explain Langevin's theory of dimagnetism. 8. Explain domain theory of ferromagnetism. 9. Define i) Retentivity ii) Coercitivity ## Unit V: Special Purpose Materials 1. Explain Refractory materials. 2. Write a short note on (i) Radioactive materials (ii) Galvanization and Impregnation of materials (iii) Structural materials 3. Explain Non-destructive testing with respect to Ultrasonic Radiography. 4. Explain in brief X-ray diffraction.