Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Production Engineering I Supplementary s, ember- ENGINEERING PHYSICS - Question Paper

Code No.NR-10153
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) Explain the terms (i) constructive interference and (ii) destructive interference, and hence derive the conditions for the maxima and minima in the Young’s experiment.
b) When the Young’s experiment was done with blue light of 436 nm, the distance between 2 successive dark fringes was obtained to be 1.05 mm. If the distance between the sources and the screen is 1.40 m, compute the distance ranging from the two slits.

2.a) Discuss in detail Fraunhofer diffraction at 2 slits.
b) Describe the experimental procedure to obtain the wavelengths of spectral lines of mercury, with the help of a transmission grating.

3.a) Describe the construction and working of a He-Ne gas laser.
b) Explain how optical fibers are classified. explain their characteristic features.

4.a) What are Miller indices? Draw (111) and (110) planes in a cubic lattice.
b) Describe edge and screw dislocations. Draw Burger’s circuit and slip planes for them.
c) The Bragg angle for reflection, in the 2nd order, from the (111) plane in a FCC crystal is 19.2o for an X-ray wavelength of 1.54 A.U. calculate the cube edge of the unit cell.

5.a) Derive an expression for electrical conductivity of a metal on the basis of classical model.
b) Explain the variation of electrical resistivity of a conductor with temperature and alloying.

6.a) Give an account of the phenomenon of superconductivity.
b) Why a superconductor is termed as a perfect diamagnetic material?
c) Describe 2 practical applications of superconducting materials.

7.a) Explain the terms (i) dielectric displacement and (ii) relative dielectric constant.
b) Explain (i) electronic polarization and (ii) ionic polarization.
8. Write short notes on any 3 of the following:
a) Damped S.H.M.
b) Double refraction
c) Einstein’s coefficient
d) Bravais lattice
e) Holography.

Earning:   Approval pending.