MID -2 ,JUNE 2024

PART-A-10 MARKS Answer all the Questions

  1. Multiple Choice Questions: 4x1-4

  2. What is the process of producing electric dipoles inside dielectric by an external electric field? a.Polarization b. dipole moment c. Susceptibility d. Magnetization

  3. An element whose permittivity is less than that of its free space is a. ferromagnetic b. diamagnetic c. paramagnetic non-magnetic

  4. Image formation in electron microscope is based on a. column length b. electron number c. differential scattering d. specimen size

  5. In the Carbon Dioxide Laser, transition takes place between the a. Molecular states b. Atomic states c. Vibrational states d. Energy states

II. Fill in the blanks: 4x1-4 5. With increase in temperature, the magnetic susceptibility of a ferromagnetic material- decrease 6. The pumping process used in Nd-YAG laser is …………… 7. The refractive indices of core and cladding of a step index optical fiber are 1.5 and 1.4 respectively, then the fractional refractive index is …………… 8. With decrease of size of nanoparticles, the interatomic spacing - Increases III. Match the following: 2x1-2 9. Alkaline Fuel Cells are the most efficient type of fuel cells [ TRUE/FALSE] 10. The sol-gel process is a wet-chemical technique used for the fabrication nanomaterials. [ TRUE/FALSE]

Part -B

Answer any four questions Each question carries equal marks

  1. a) Briefly discuss the polarization phenomenon in dielectric materials. 2M b) Write short notes on LCD's and crystal oscillators. 3M

2.a) Draw and explain B-H curve for a ferramagnetic materials. 2m b) Describe the working principle of solid oxide fuel cells.3m

  1. a) Explain the classification of solid electrolytesis. 2m b) Explain construction and working of Lithium ion batteries. 3m

  2. a) Derive the Einstein coefficient relations between them. 2m b) Describe the working of CO2 and Argon-ion lasers. 3m

  3. a) Explain the principle behind the functioning of an optical fiber. 2m b) explain the construction and working of SEM analysis method. 3m

  4. a) Describe the function of multimode graded index optical fiber along with its refractive index profile. 2m b) Derive an expression for acceptance angle for an optical fiber. How it is related to Numerical aperture? 3m

MID- 2 , DEC 2024/JAN 2025

  1. Describe construction and working principle of solid fuel cells

[5 Marks]

  1. Write a note on bubble memory device.

[5 Marks]

  1. Discuss fabrication of nanomaterials using sol-gel method.

[5 Marks]