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Posted By: satish Member Level: Gold Posted Date: 11 Feb 2008
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2005 Jawaharlal Nehru Technological University Mechanical Engineering ENGINEERING PHYSICS I B.Tech Supplementary Examinations, November/December 2005 Question paper
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Code No: NR10103 NR
I B.Tech Supplementary Examinations, November/December 2005
ENGINEERING PHYSICS
(Common to Civil Engineering, Mechanical Engineering, Chemical
Engineering, Mechatronics, Metallurgy & Material Technology, Production
Engineering and Aeronautical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Define spatial and temporal coherence.
(b) Derive an expression for the width of fringes obtained in the case of air wedge.
(c) Show that the radii of Newton’s rings are in the ratio of the square roots of
natural numbers.
[4+6+6]
2. (a) What do you understand by diffraction of light? Distinguish clearly between
interference and diffraction of light.
(b) Discuss the Fraunhofer diffraction at a single slit.
[6+10]
3. (a) What are Quarter and half wave plates?
(b) Describe how circularly and elliptically polarized lights are produced.
(c) Calculate the thickness of a Quarter wave plate for light of wave length
6000A.V. (µo = 1.554, µe = 1.544)
[5+8+3]
4. (a) Describe the construction of a typical optical fiber.
(b) Define NA and obtain its expression for an optical fiber.
(c) Describe the light wave communication process using optical fibers.
[3+5+8]
5. (a) Explain loss tangent or dielectric loss in dielectrics.
(b) Write a note on polarization in dielectrics.
[10+6]
6. (a) Write a short note on TypeI
and TypeII
super conductors.
(b) Discuss the BCS theory of super conductivity.
[8+8]
7. (a) Write a short note on soft and hard magnetic materials.
(b) Discuss the mechanism of creep.
[8+8]
8. Answer the following
(a) Grating spectrum
(b) Characteristics of laser light.
(c) Ruby laser
(d) Applications of ultrasonics.
[3+3+6+4]
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