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Posted Date: 09 Aug 2009 Posted By: Prashant Narayan Iyer Member Level: Gold
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2006 Mahatma Gandhi University B.TECH DEGREE EXAMINATIONS II SEMESTER ELECTRICAL AND ELECTRONICS ENGINEERING ENGINEERING PHYSICS Question paper
EACH QUESTION CARRIES 4 MARKS. (10 X 4 = 40 MARKS)
1. Explain the terms (a) Population inversion and (b) Metastable state.
2. Write a short note on semiconductor laser.
3. What is isotopic effect on superconductors?
4. Briefly explain any four applications of superconductors.
5. What are different crystal systems?
6. Define Packing factor. Calculate the packing factor for body-centred cube.
7. Define Magnetic permeability and Susceptibility. Obtain the relation between them.
8. How are dielectric materials classified?
9. With a neat diagram, explain the structure of an optical fibre.
10. Explain any four advantages of Optical fibre over the conventional cables.
EACH QUESTION CARRIES 12 MARKS. (5 X 12 = 60 MARKS)
11. (a) Describe the construction and working of an electron microscope.
Or
(b) Describe the construction and working of He-Ne laser.
12. (a) What are type I and type II superconductors? Explain B.C.S. with the key note of Cooper pairs.
Or
(b) What is SQUID ? Explain its working. Explain Josephson effect.
13. (a) What do you mean by Miller indices? Give their role in crystal structure. Calculate the separation between
lattice planes in face-centred cubic lattice.
Or
(b) Give the theory of Bragg’s X-ray diffraction. Describe Bragg’s X-ray spectrometer. How it is used to verify Bragg’s
law?
14. (a) How do you distinguish between Diamagnetic, Paramagnetic and Ferromagnetic materials?
Or
(b) What is piezoelectric effect? With necessary circuit diagram, explain the production of ultrasonics using
Piezoelectric crystal.
15. (a) Explain with necessary theory, the propagation of light in optical fibres. Derive the expression for numerical
aperture.
Or
(b) Describe various types of optical fibres. Explain optical fibre sensors.
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