Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Aeronautical Engineering I Supplementary s, ember- ENGINEERING PHYSICS - university 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 and 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 the interference of light produced by Young’s double slit experiment.
b) Explain the colours of thin films in the case of a transmitted system.
c) In a Newton’s rings experiment the diameter of the twelfth ring modifications from
15.0 mm to 13.5 mm when a liquid is introduced ranging from the lens and the glass plate. compute the refractive index of the liquid.

2.a) Explain the different methods to produce plane-polarized light.
b) Describe the construction and working of (i) a quarter-wave plate and
(ii) a half-wave plate.

3.a) Describe the methods of ‘pumping’ to achieve ‘population inversion’.
b) Describe the construction and working of a He-Ne gas laser.

4.a) What is dielectric loss? Derive an expression for dielectric loss.
b) Explain the term ‘dielectric strength’.
c) The number of atoms in a quantity of 1 cubic metre of hydrogen gas is
9.80 ? 1026. The radius of hydrogen atom is 0.53 A.U. compute the polarizability and relative permittivity of hydrogen gas.

5.a) Derive an expression for electrical conductivity on the basis of Drude-Lorentz theory.
b) Describe the classification of conductor, semiconductor and insulator on the basis of band theory of solids.

6.a) Explain the origin of permanent magnetic dipole moment.
b) Give the characteristic properties of dia, para and ferromagnetic materials.
c) A magnetizing field of 1200 A/m produces a magnetic flux of 2.4 ? 10-5 weber in an iron bar of cross-sectional area 0.2 cm2. compute the permeability and susceptibility of the bar.
7.a) Discuss in detail the properties of superconductors.
b) Describe d.c. and a.c. Josephson’s effects and discuss their importance.
c) Calculate the critical current that can flow through a long thin superconducting wire of aluminium of diameter 10-3 m. The critical magnetic field for aluminium is 7.9 ? 103 amp/m.

8. Write short notes on any 4 of the following:
(a) Diffraction grating
(b) Ultrasonic testing systems
(c) Types of optical fibers
(d) Anti-ferromagnetism
(e) Flux quantization
(f) Creep.

Earning:   Approval pending.