Jawaharlal Nehru Technological University Hyderabad 2003 B.Tech Aeronautical Engineering I Supplementary s, ember- ENGINEERING PHYSICS -university question 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) Distinguish ranging from spatial coherence and temporal coherence of electromagnetic waves.
b) How can Newton’s rings be formed in the laboratory? How can you use them to measure the wavelength of sodium light?
c) Two plane glass plates are placed together with a piece of paper ranging from the 2 at 1 edge. obtain the angle of the wedge shaped air film ranging from the plates, if on viewing the film normally with monochromatic light of wavelength 480 nm, there are 18 fringes per cm.

2.a) Distinguish ranging from polarized light and unpolarized light.
b) How circularly polarized light and ellipticaly polarized light are produced?
c) Describe the ultrasonic testing systems relating to non-destructive testing of material.

3.a) Explain the terms: (i) spontaneous emission (ii) stimulated emission
(iii) meta-stable state and (iv) population inversion.
b) Describe the construction and working of a Ruby laser.

4.a) Explain what is meant by polarization in dielectrics.
b) Describe, in detail, the various polarization mechanisms in dielectrics and discuss their temperature dependence.
c) If a sodium chloride crystal is subjected to an electric field of 1000 V/m, and the resulting polarization is 4.3 ? 10-8 C/m2, compute the relative permittivity of the crystal. [Permittivity of vaccum = 8.854 ? 10-12 F/m]

5.a) What are the main sources of electrical resistance in a metal?
b) Discuss the effect of impurity, temperature and alloying on the electrical conductivity of metal.
c) A copper wire has resistivity of 1.7 ? 10-8 ohm-m at room temperature of 30oC. If the copper is highly pure, obtain the resistivity at 300oC
6.a) Define the subsequent terms:
(i) intensity of magnetization (ii) magnetic susceptibility
(iii) magnetic permeability and (iv) magnetic induction.
b) Discuss the importance of hysteresis curve.
c) The magnetic susceptibility of a magnetic material is 948 ? 10-11. compute the permeability and relative permeability.

7.a) Discuss the Meissner effect in superconductors.
b) What is meant by flux quantization?
c) Explain the principle of SQUID.

8. Write short notes on any 4 of the following:
(a) Rayleigh’s criterion
(b) Brewster’s legal regulations
(c) Uses of optical fibers
(d) Diamagnetism
(e) BCS theory of superconductivity
(f) Frank Reed mechanism.

Earning:   Approval pending.