Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Aeronautical Engineering I Supplementary s, ember- ENGINEERING PHYSICS - exam paper

Code No.NR-10103
I B.Tech. Supplementary Examinations, November-2003

ENGINEERING PHYSICS
(Common to Civil Engineering, Mechanical Engineering, Aeronautical Engineering, Chemical Engineering, Production Engineering, Mechatronics Metallurgy and Material Technology)
Time: three hours Max.Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1.a) Describe and discuss the Fraunhofer diffraction trend found due to a narrow slit illuminated by a parallel beam of mono-chromatic light.
b) What is meant by resolving power of an optical instrument? discuss Rayleigh’s criterion for just resolution.
c) In a plane transmission grating the angle of diffraction for the 2nd order principal maximum for the wavelength 500 nm is 30o. compute the number of lines in 1 centimetre of the grating surface.

2.a) Distinguish ranging from o-ray and e-ray of light.
b) Explain Brewster’s legal regulations of polarization.
c) Quartz has refractive indices 1.5533 and 1.5442. compute the thickness of the quarter-wave plate, cut from quartz, for sodium light of wavelength 589 nm.

3.a) Explain how glass fiber guides light from 1 end to the other.
b) Describe the difference ranging from a step-index fiber and a graded-index fiber.
c) An optical fiber has a numerical aperture of 0.20, and a cladding refractive index of 1.59. obtain the acceptance angle for the fiber in water having refractive index of 1.33.

4.a) Define dielectric susceptibility and polarizability of a dielectric and find a relation ranging from them.
b) Explain ‘electronic polarization’ and ‘orientational polarization’ in dielectrics.
c) Explain the term ‘dielectric strength’.

5.a) Discuss the different drawbacks of classical free electron theory of metals and discuss the assumptions made in quantum theory to overcome the drawbacks.
b) The resistivity of aluminium at room temperature is 2.62 ? 10-8 ohm-m, and the number of electrons per cubic metre is 18.10 ? 1028. compute the mobility of electrons on the basis of classical free electron theory.

6.a) Define magnetic permeability and magnetic susceptibility, and establish a relation ranging from them.
b) Describe hysteresis property of a ferromagnetic material
7.a) Distinguish ranging from Type-I and Type-II superconductors.
b) Discuss BCS theory of superconductivity.
c) Mention a few industrial applications of superconducting materials.

8. Write short notes on any 4 of the following:
(a) Colours of thin films
(b) Ultrasonic testing systems
(c) Applications of laser
(d) Ferri-magnetic materials
(e) Hooke’s legal regulations
(f) Fatigue

Earning:   Approval pending.